Entries |
Document | Title | Date |
20080198724 | Method For Recording Data In Holographic Data Storage Systems - The invention relates to a method for recording data in a holographic recording medium ( | 08-21-2008 |
20080198725 | Holographic Storage Medium, Method of Manufacturing a Holographic Storage Medium and Method of Reading Data From a Holographic Storage Medium - The present invention relates to a holographic storage medium ( | 08-21-2008 |
20080205238 | RECORDING/REPRODUCING METHOD, RECORDING/REPRODUCING APPARATUS AND HOLOGRAPHIC INFORMATION STORAGE MEDIUM - A recording/reproducing method and recording/reproducing apparatus, which use an information storage medium by adaptively preparing a standard for distinguishing bit | 08-28-2008 |
20080205239 | APPARATUS AND METHOD FOR RECORDING/REPRODUCING DATA ON/FROM HOLOGRAPHIC STORAGE MEDIUM - An apparatus and a method for recording/reproducing data on a holographic storage medium using temperature information of the holographic storage medium. The apparatus includes: a light processing unit to record the data on the holographic storage medium or to reproduce the data from the holographic storage medium; and a control unit to control the light processing unit, such that the data is recorded on the holographic storage medium, using a recording wavelength determined according to a temperature of the holographic storage medium or an ambient temperature thereof. | 08-28-2008 |
20080212449 | Optical Data Carrier System - The present invention provides a method of holographically storing data as in a series of grating structures including m-level coded elements in an optical data carrier, wherein m≧2, the method comprising: forming a grating sampling function as a direct sum of N partial grating sampling functions, each partial grating sampling function having a phase (φ n) and amplitude (d | 09-04-2008 |
20080219128 | OPTICAL PICKUP, OPTICAL INFORMATION RECORDING AND REPRODUCING APPARATUS AND METHOD FOR OPTICALLY RECORDING AND REPRODUCING INFORMATION - An optical pickup for recording a hologram by using an angle multiplexing method. An optical beam is separated into two beams, a signal beam and a reference beam having different convergence/divergence degrees, by using an optical component such as a diffraction lens. The signal and reference beams are made incident upon the same objective, and the optical component or the objective lens is moved in a direction perpendicular to an optical axis, to thereby realize angle multiplex recording. If an optical information recording medium is inclined, the optical component or the objective lens is moved along the direction along which the optical information recording medium moved to change an angle of the reference beam incident upon the optical information recording medium and compensate for degradation of a reproduction signal. | 09-11-2008 |
20080225670 | OPTICAL PICKUP, OPTICAL INFORMATION RECORDING APPARATUS AND OPTICAL INFORMATION RECORDING AND REPRODUCING APPARATUS USING THE OPTICAL PICKUP - In holographic recording, it is important to form stably an interference fringe between a reference beam and a signal beam in a holographic storage medium. To suppress factors degrading stability of the interference fringe, such as fluctuation of atmospheric air, position displacement of optical components and the like during propagation of the reference and signal beams, an optical pickup and an optical information recording/reproducing apparatus adopt an optical system structure providing a higher proportion of optical components shared by the reference and signal beams optical path than conventional optical system structure. To increase the proportion of shared optical components, the signal beam and the reference beam pass through the PBS prism as parallel beams and a concave lens is placed on a reference beam path just before the objective lens. | 09-18-2008 |
20080225671 | Method and storage medium for calibrating a holographic storage system - Method for calibrating a holographic storage system The present invention relates to a method for calibrating a holographic storage system, and to an apparatus for reading from and/or writing to holographic storage media and a holographic storage medium suitable for such method. According to the invention, the method has the steps of:
| 09-18-2008 |
20080239921 | OPTICAL INFORMATION RECORDING MEDIUM, OPTICAL INFORMATION RECORDING AND REPRODUCING APPARATUS, AND POSITION CONTROL METHOD - An optical information recording medium includes a recording layer in which information can be recorded as a hologram by using a phenomenon of interference between an information light beam and a reference light beam. The recording layer is sandwiched between substrates. A thin film layer that is laminated on the substrate on light output side. Openings are formed in the recording layer and those openings allow passage of the information light beam and the reference light beam. | 10-02-2008 |
20080239922 | OPTICAL DISC APPARATUS, INFORMATION RECORDING METHOD, AND INFORMATION REPRODUCTION METHOD - An optical disc apparatus that records recording marks in a plurality of mark layers by irradiating predetermined light onto a disc-like volume type recording medium on the basis of information to be recorded is disclosed. The apparatus includes: a first focus position adjusting means for adjusting the position of a focus on which a first light beam focuses within the volume type recording medium, in the direction of an optical axis of the first light beam; a second focus position adjusting means for adjusting the position of a focus on which a second light beam focuses within the volume type recording medium, in the direction of an optical axis of the second light beam; a focus control means for controlling the first focus position adjusting means and the second focus position adjusting means; and a recording control means for forming the recording marks at the positions of respective focuses. | 10-02-2008 |
20080239923 | HOLOGRAM RECORDER AND HOLOGRAM RECORDING METHOD - A hologram recorder includes a light source for emitting a laser beam, a polarizing beam splitter for splitting the laser beam into a recording beam and a reference beam in accordance with a state of polarization, and a rotary polarizer located between the light source and the polarizing beam splitter. The rotary polarizer has the function of optical rotation, whereby a polarization component to be the recording beam is increased from the central portion toward the peripheral portion of the laser beam, and a polarization component to be the reference beam is decreased from the central portion toward the peripheral portion of the laser beam. | 10-02-2008 |
20080247294 | Data reading method - A data reading method used in a reading device for reading a holographic storage medium is provided. The holographic storage medium has several data areas. Each data area has several data pages, and each data page forms a data image that has at least one reserved block pattern on the reading device. The reserved block pattern of the data image corresponding to a first data page is searched within a first searching region to obtain a first pattern position. The reserved block pattern of the data image corresponding to a second data page is searched within a second searching region to obtain a second pattern position. A third searching position is then determined according to the first and second pattern positions. The reserved block pattern of the data image corresponding to a third data page is searched within a third searching region whose center is at the third searching position. | 10-09-2008 |
20080253257 | Phase-Conjugate Read-Out in a Holographic Data Storage - The invention relates to a holographic data storage medium ( | 10-16-2008 |
20080259763 | APPARATUS AND METHOD TO DETERMINE AN OPTIMAL POWER LEVEL TO ENCODE INFORMATION HOLOGRAPHICALLY - A method is disclosed to determine an optimal power level to encode information holographically. The method sets (N) evaluation power levels, displays an evaluation image on a spatial light modulator. For each value of (i), the method energizes a light source using the (i)th power level, generates the (i)th reference beam, generates the (i)th carrier beam, forms the (i)th data beam comprising the evaluation image, forms the (i)th hologram using the (i)th reference beam and the (i)th data beam, and encodes the (i)th hologram in a holographic data storage medium, where (i) is greater than or equal to 1 and less than or equal to (N). | 10-23-2008 |
20080259764 | ARRANGING AND DESTAGING DATA TO HOLOGRAPHIC STORAGE - Data for storage by holographic data storage is arranged in an intermediate data storage as data segments which are replicas of holographic storage segments. Files of data are aggregated into the data segments, and a destaging control determines the destaging of the data segments to the holographic data storage in accordance with a plurality of policies, such as whether a segment is full, a time threshold has been reached, or whether a threshold number of segments are “open”. The intermediate data storage may be arranged into a number of partitions at least equal to the number of sources having input to the data destaging system, the partitions comprising integral multiples of the data segments. | 10-23-2008 |
20080259765 | ARRANGING AND DESTAGING DATA TO HOLOGRAPHIC STORAGE - Data for storage by holographic data storage is arranged in an intermediate data storage as data segments which are replicas of holographic storage segments. Files of data are aggregated into the data segments, and a destaging control determines the destaging of the data segments to the holographic data storage in accordance with a plurality of policies, such as whether a segment is full, a time threshold has been reached, or whether a threshold number of segments are “open”. The intermediate data storage may be arranged into a number of partitions at least equal to the number of sources having input to the data destaging system, the partitions comprising integral multiples of the data segments. | 10-23-2008 |
20080267038 | OPTICAL DEVICE FOR HOLOGRAPHIC RECORDING OR READING AND METHOD FOR CONTROLLING THE SAME - An optical device for holographic recording or reading is provided and includes: a light emission unit that emits light to be irradiated on an optical recording medium, the light being recording or reading light; a first prism unit that moves in accordance with a moving speed of the optical recording medium and refracts the light to move the light irradiated on the optical recording medium over a distance in a moving direction of the optical recording medium so that the light is irradiated on substantially the same position on the optical recording medium for a period of time; and a second prism unit that moves in accordance with the moving speed of the first prism unit to compensate for an optical path length of the light. | 10-30-2008 |
20080267039 | HOLOGRAPHIC RECORDING APPARATUS, HOLOGRAPHIC REPRODUCING APPARATUS AND HOLOGRAPHIC RECORDING AND REPRODUCING APPARATUS - A holographic recording apparatus causes reference light and information light to interfere with each other, and records the interference pattern in a recording medium. The holographic recording apparatus has an objective lens and a focus position controller. The objective lens focuses both the reference light and the information light at a focus position of the recording medium. The focus position controller changes the focus position into a predetermined position on the light path of the reference light. | 10-30-2008 |
20080267040 | TWO-DIMENSIONAL DIGITAL DATA ACQUISITION ELEMENT AND HOLOGRAPHIC STORAGE APPARATUS - A two-dimensional digital data acquisition element includes: a pixel area having a plurality of pixels arranged in a matrix form, each of the pixels having a photoelectric conversion element to convert the reproduced light from the optical information recording medium to an electric signal; selection circuits which select the pixel; a readout circuit which reads out an electric signal of a pixel selected by the selection circuits; and a 1-bit AD converter which converts an output of the readout circuit to 1-bit digital data. A pitch ratio N between a pitch P1 of the unit data areas in the two-dimensional digital image information and a pitch P | 10-30-2008 |
20080273444 | Holographic Record Carrier - A holographic record carrier is capable of recording or reproducing information by irradiating light. The holographic record carrier is comprised of a holographic recording layer for storing an optical interference pattern produced by a signal light component of a coherent reference light and a signal light as a diffraction grating therein; a reflective layer stacked on the holographic recording layer in the opposite side of the light incidence side; and a plurality of non-reflective regions arranged on the reflective layer in the same interval as the record-interval of the diffraction grating. | 11-06-2008 |
20080285419 | HOLOGRAM OPTICAL DEVICE, AND COMPATIBLE OPTICAL PICKUP HAVING THE HOLOGRAM OPTICAL DEVICE AND OPTICAL INFORMATION STORAGE MEDIUM SYSTEM EMPLOYING THE COMPATIBLE OPTICAL PICKUP - A hologram optical device, and a compatible optical pickup having the hologram optical device and an information storage medium system employing the hologram optical device. The hologram optical device includes a hologram having a pattern having a period in a 4-step stairway shape. At least one of first, second, third, and fourth steps of the 4-step stairway shape is formed in a different width from at least one other step. | 11-20-2008 |
20080291806 | Optical Device for Recording and Reproducing Holographic Data - The invention relates to an optical recording and reproducing device. This device comprises means for receiving a recording medium ( | 11-27-2008 |
20080291807 | Hologram Record Carrier and Record Reproducing Method and System - A hologram recording carrier is provided with a hologram recording layer that stores inside an optical interference pattern made by components of irradiated coherent reference light and signal light, as a diffraction grating; and a polarization selective reflection film that is arranged on an opposite side to a light irradiation plane of the hologram recording layer and reflects a second linear polarization component rotated from a first linear polarization component, without reflecting the first linear polarization component of incident light. | 11-27-2008 |
20080298207 | Reproduction Device and Reproduction Method - Reproduction reference light is irradiated on a hologram recording medium on which imaged digital data are recorded as a plurality of element holograms in the form of interference fringes obtained by interference between object light of the digital data and recording reference light. Then, a reproduction image obtained from the hologram recording medium by the irradiation of the reproduction reference light is detected. Then, readout data are produced based on the detected reproduction image. Thereafter, it is discriminated whether or not the readout data should be stored into a memory, and the readout data are stored into the memory in response to a result of the discrimination. Where a predetermined amount or more of the data is accumulated in the memory, reproduction data are produced from the readout data accumulated in the memory and then reproduced. | 12-04-2008 |
20080304392 | Hologram Storage System - A hologram storage system having a plurality of data bits groups (each data bits group is related to each other, and all these data bits groups together constituted to a codeword) stored on different pages of a storage medium, so that the correcting ability of the ECC (error-correction coding) unit is enhanced. | 12-11-2008 |
20080310281 | RECORDING AND REPRODUCING APPARATUS, RECORDING AND REPRODUCING METHOD, REPRODUCING APPARATUS, AND REPRODUCING METHOD - A recording and reproducing apparatus includes a spatial-light-intensity modulating unit, a spatial-light-phase modulating unit, an optical system that transmits light and leads the light to a hologram recording medium, a converting unit that converts an input data sequence; an amplitude and phase controlling unit that controls, during recording, the spatial-light-intensity modulating unit and the spatial-light-phase modulating unit to generate a signal light and a reference light, and controls, during reproduction, light intensity of each of pixels in a reference light area and a signal light area and controls a phase of each of the pixels, an image-signal acquiring unit that receives the reproduced image and the DC light and obtains two kinds of image signals, a difference calculating unit that calculates a difference between the two kinds of image signals, and a decoding unit that decodes data formed by a combination of the two kinds of values. | 12-18-2008 |
20080310282 | Method for Acquiring Optimum Position of Reserved Block in Holographic Storage System - A method for acquiring an optimum position of a reserved block in a holographic storage system is provided. Firstly, an initial offset error between an initial reserved block and its two nearest neighbors is computed. Then, according to a dynamically adjustable modified centroid function β′, a second reserved block is obtained by interpolating the covariance values associated with the initial reserved block and the respective two nearest neighbors. Afterwards, the optimum position of the reserved block is acquired according to the second reserved block and the initial offset error. | 12-18-2008 |
20080316894 | HOLOGRAPHIC RECORDING/REPRODUCING APPARATUS HAVING APERTURE OF VARIABLE SIZE - Provided is a holographic recording/reproducing apparatus including an aperture device having aperture of variable size. The holographic recording/reproducing apparatus includes a light source, an optical system to divide light emitted from the light source into a recording reference beam and a recording signal beam, and direct the recording reference beam and the recording signal beam to a same location of a holographic recording medium, a spatial light modulator (SLM) to modulate the recording signal beam into a two-dimensional signal pattern, a two-dimensional photodetector to detect a reproducing signal beam that is refracted via the holographic recording medium, and the aperture to limit a size of a spot of the reproducing signal beam, wherein the size of the aperture is variable. | 12-25-2008 |
20080316895 | Data Processing Method for a Holographic Data Storage System - A data processing method for a holographic data storage system includes in a writing operation, receiving a plurality of digital data groups; modulating the digital data groups to a plurality of corresponding digital matrixes, wherein each of the digital matrix comprises a digital data group and a plurality of digital redundancies; arraying the digital matrixes on a data plane to form an image information, wherein the image information has more opaque pixels than transparent pixels; and storing the image information in a storage medium; and in a reading operation, receiving the image information; transforming the image information into a plurality of analog matrixes, wherein each of the analog matrixes comprises an analog data portion and an analog redundancy portion; demodulating the analog matrixes to a plurality of corresponding analog data groups; and transforming the analog data groups into a plurality of digital data groups by using a soft decision apparatus. | 12-25-2008 |
20080316896 | Optical Recording/Reproducing Apparatus, Optical Recording Method, and Optical Reproduction Method - To provide an optical recording/reproducing apparatus, optical recording method and optical reproduction method, which can easily recognize whether or not the surface temperature of an optical recording medium capable of multiplexing recording by collinear holography is outside the allowable use temperature range and thus can achieve excellent reproduction free from displacement or deformation of image. The apparatus performs at least one of recording by application of an information beam and a reference beam to an optical recording medium having a recording layer for recording information by holography, and reproduction of information by application of a reproduction beam, and comprises at least one of: a warning unit configured to inform that, upon recording or reproduction, a surface temperature of the optical recording medium has fallen outside a use-allowable temperature range with respect to a reference temperature; and an aborting unit configured to display the fact that at least one of recording and reproduction will be aborted and abort the recording and reproduction, when the surface temperature has fallen outside a use-limit temperature range with respect to the reference temperature. Moreover, it is preferably an optical recording method or optical reproduction method. | 12-25-2008 |
20090003179 | DIRECTORY HOLOGRAM FORMING AN ANCHOR LOCATION OF A PATTERN OF STORED HOLOGRAMS - A method writes at least a group of holograms in a predetermined pattern in the holographic storage medium, and writes a directory hologram which relates to the holograms of the group to form an anchor location of the predetermined pattern. Further, a directory comprising the directory hologram is stored in a memory, and a read operation of at least one hologram of a group is initiated with an access for the directory hologram of the group at the anchor location; reading the accessed hologram, employing a matched filter to cross-correlate the read accessed hologram with an ideal version of the directory hologram derived from the directory stored in the memory; and determining whether the read accessed hologram is the directory hologram of the group. | 01-01-2009 |
20090003180 | HOLOGRAPHIC RECORDING APPARATUS, HOLOGRAPHIC REPRODUCING APPARATUS, HOLOGRAPHIC RECORDING METHOD AND HOLOGRAPHIC REPRODUCING METHOD - A holographic recording apparatus is provided and includes: a signal light generation section that generates signal light modulated according to digital data; a reference light generation section that generates reference light modulated by means of a pixel pitch; a adding section that adds, in proximity to a light-convergence position where the signal light and the reference light come close to each other or overlap each other, a low-order component of the signal light obtained by Fourier transform and a high-order component of the reference light obtained by Fourier transform, the high-order component of the reference light having a spatial frequency region differing from that of the low-order component of the signal light; and an illumination optical system that irradiate an optical recording medium with the added signal and reference light. | 01-01-2009 |
20090003181 | HOLOGRAM RECORDING MEDIUM, HOLOGRAM RECORDER/REPRODUCER, HOLOGRAM RECORDING METHOD, AND HOLOGRAM REPRODUCING METHOD - A hologram recording medium (B) includes a recording region (Ba) where a condensation spot (sp) is formed upon being irradiated with an information beam (I) and a reference beam (R) under the interference thereof. A hologram is recorded on each condensation spot (sp). The recording region (Ba) includes a diffraction grating (Dg), which includes a plurality of deficient portions (df) that serve as a sight target for the condensation spot (sp). | 01-01-2009 |
20090010133 | Recording medium using reference pattern, recording/reproducing method of the same and apparatus thereof - A recording medium, a recording/reproducing method of the same and an apparatus therefor, by which data of high volume can be recorded/reproduced. The present invention includes the steps of inserting a reference pattern including a multiple divided areas in a data image and recording the data image in the recording medium, wherein the multiple divided areas are in a relation of inversion and/or rotation and/or symmetrization. | 01-08-2009 |
20090010134 | Holographic storage medium with integrated phase mask - The present invention relates to a holographic storage medium, and more specifically to a holographic storage medium with an integrated phase mask layer. | 01-08-2009 |
20090016189 | RECORDING/REPRODUCING APPARATUS, METHOD OF REPRODUCING DATA, AND SERVO CONTROLLING METHOD - An apparatus for recording/reproducing data using holography technology and a method of reproducing data using the same are disclosed. The recording/reproducing apparatus includes an optical path adjuster which adjusts the path of light emitted from a light source and irradiates the light to a predetermined position of a recording medium, a light reflecting unit which reflects the light transmitting through the recording medium to the predetermined position of the recording medium, an image sensor which receives the reflected light and reproduces data included in the reflected light, and a light receiving unit receiving light, which is not transmitted through the recording medium and is diffracted from the recording medium, and generating a monitoring signal. Accordingly, it is possible to provide a simple optical system suitable for the recording/reproducing apparatus using the holography technology and an efficient method of reproducing data using the same. | 01-15-2009 |
20090022031 | OPTICAL RECORDING METHOD, OPTICAL REPRODUCTION METHOD, OPTICAL RECORDING APPARATUS, AND OPTICAL RECORDING MEDIUM - The present invention provides an optical recording method including: recording information on a recording layer for holographically recording information in an optical recording medium by irradiating the optical recording medium with an information beam and a reference beam, and repetitively recording information on the recording layer while moving at least any one of the information beam and reference beam and the recording layer along the surface of the recording layer, thereby being capable of shift-multiplex recording operations, wherein the optical recording medium is irradiated on a recording pulse basis, the peak intensity of light of the recording pulse is 0.1 mW to 100 mW, the irradiation time is 0.05 nsec to 1×10 | 01-22-2009 |
20090028032 | HOLOGRAM REPRODUCING APPARATUS - A hologram reproducing apparatus includes a reference-light spatial-light modulating section that displays a reference light pattern for generating reference light, an image sensor that has pixels arrayed two-dimensionally that receive diffractive light generated by irradiating the reference light on a hologram recording medium, and a control unit that processes an electric signal from the image sensor and reproduces recording data. The control unit detects a predetermined area electric signal, detects a hologram electric signal, subtracts the predetermined area electric signal from the hologram electric signal to obtain a reproduced signal after noise reduction, and reproduces the recording data from the reproduced signal after noise reduction. | 01-29-2009 |
20090034394 | Optical Pickup - An optical pickup device in which a hologram element has a plurality of different diffraction directions. In the tracking standard state, the hologram element is divided into six areas by a straight line connecting two strength center points of two light beams, and by two straight lines that are perpendicular to the straight line. By adding the amount of light received by an area demarcated by two straight lines that pass the two strength center points, to the amount of light received by one of two outer areas sandwiching the area depending on the type of the light beam, it is possible to obtain a well-balanced tracking error signal for each of the two light beams. | 02-05-2009 |
20090034395 | APPARATUS AND METHOD TO DETERMINE AN OPTIMAL OPTICAL DETECTOR ORIENTATION TO DECODE HOLOGRAPHICALLY ENCODED INFORMATION - A method is disclosed to determine an optimal optical detector orientation to decode information encoded holographically. The method supplies a matched filter, an orientation image, a holographic data storage medium encoded with the orientation image, and an optical detector comprising a moveable input screen comprising a plurality of detector elements. The method positions the input screen in a plurality of input screen orientations and calculates a correlation factor for each of the input screen orientations. The method determines an optimal optical detector orientation using the plurality of correlation factors. | 02-05-2009 |
20090034396 | APPARATUS AND METHOD TO STORE INFORMATION IN A HOLOGRAPHIC DATA STORAGE MEDIUM - A method to store information in a holographic data storage medium, wherein the method supplies a holographic data storage medium comprising an encoded focusing hologram and one or more encoded data holograms. The method disposes the holographic data storage medium in a holographic data storage system, and disposes a rotatable imaging lens at an (i)th orientation. The method illuminates the encoded focusing hologram to generate an (i)th reconstructed focusing image, projects that (i)th reconstructed focusing image through the rotatable imaging lens, and onto at optical detector array. The method then calculates an (i)th measured focusing metric, and determines if the (i)th measured focusing metric is greater than or equal to the threshold focusing metric. If the (i)th measured focusing metric is greater than or equal to the threshold focusing metric, then the method decodes the one or more encoded data holograms. | 02-05-2009 |
20090034397 | HOLOGRAM RECORDING/RECONSTRUCTING APPARATUS - A hologram recording/reconstructing apparatus includes a spatial modulator in which a reference beam region and a reconstruction beam region are formed, and a controller configured to control a range of the reference beam region and a range of the reconstruction beam region. According to a temperature of a hologram recording medium during recording, the controller sets the range of the reference beam region to a first predetermined range and thereby sets a range of an incident angle of a reference beam on the hologram recording medium to a first predetermined angle range. According to a temperature of the hologram recording medium during reconstruction of recorded data, the controller sets the range of the reconstruction beam region to a second predetermined range and thereby sets a range of an incident angle of a reconstruction beam on the hologram recording medium to a second predetermined angle range. | 02-05-2009 |
20090040903 | HOLOGRAM RECORDING/REPRODUCING APPARATUS AND LIGHT SOURCE APPARATUS - A hologram recording/reproducing apparatus records data as a hologram by applying signal and reference light beams to a hologram-recording medium, obtains a diffracted light beam by applying a reproduction light beam to the hologram, and reproduces the data using the diffracted light beam. The hologram recording/reproducing apparatus includes an external-cavity light source, a polarization-control element that changes a polarization angle of a light beam emitted from the external-cavity light source, a polarizing-beam-splitting element that splits the light beam to obtain two light beams and that changes a ratio between amounts of the two light beams, a photoreceptor that receives one of the two light beams, a spatial light modulator that receives the other beam and that generates signal, reference, and reproduction light beams, and a control unit that changes the polarization angle or polarization state of the light beam. | 02-12-2009 |
20090046559 | HOLOGRAPHIC INFORMATION STORAGE MEDIUM, AND METHOD AND APPARATUS FOR RECORDING/REPRODUCING HOLOGRAPHIC INFORMATION USING THE SAME - A holographic storage medium includes a substrate; a cover layer to receive a first circular polarization beam having a first polarization direction and a second circular polarization beam having a second polarization direction orthogonal to the first polarization direction; a polarization beam splitting/reflective layer disposed between the substrate and the cover layer to reflect the first beam while maintaining the first polarization direction of the first beam, and to transmit the second beam; and a holographic recording layer disposed between the polarization beam splitting/reflective layer and the cover layer to record information as an interference pattern formed in the holographic layer by the first beam reflected by the polarization beam splitting/reflective layer and the second beam received by the cover layer. | 02-19-2009 |
20090046560 | Hologram recording and reproduction apparatus - A hologram recording and reproduction apparatus is disclosed which can raise the degree of freedom in design to achieve miniaturization thereof and can raise the hologram recording density of the shift multiplexing type. Upon recording, recording light specially optically modulated by a spatial optical modulator and reference light having a wave front disturbed at random by a randomizing phase mask are coupled so as to have a common optical axis and introduced to a recording area of a hologram recording medium. As a result, the number of lenses to be moved so as to follow up the variation of the position of a recording area or a reproduction area can be reduced. Further, the random disturbance of the wave front of the reference light makes the shift selectivity sharp in both of the along-track direction and the cross-track direction. | 02-19-2009 |
20090052300 | HOLOGRAM INFORMATION RECORDING MEDIUM AND HOLOGRAM INFORMATION RECORDING/REPRODUCING DEVICE - [Object] To provide a hologram information recording medium and a hologram information recording/reproducing device capable of accurately reproducing data multiplexed on the recording medium irrespective of the influence of the external environment and so forth. | 02-26-2009 |
20090052301 | Optical system for detecting data signal and tracking error signal including polarizing optical element - In an optical system, reflected light from the disk is diffracted by a hologram optical element, and received by an optical detector. A focusing error signal is detected from −1st-order diffracted light of the hologram optical element. A tracking error signal by the differential phase method, a tracking error signal by a push-pull method and the data signal recorded on the disk are detected from +1st-order diffracted light of the hologram optical element. A diffraction efficiency of the +1st-order diffracted light is higher than a diffraction efficiency of the −1st-order diffracted light. | 02-26-2009 |
20090059763 | FILTER FOR OPTICAL RECORDING MEDIUM, OPTICAL RECORDING MEDIUM, METHOD FOR PRODUCING THE SAME, OPTICAL RECORDING METHOD AND OPTICAL REPRODUCING METHOD - The present invention provides a filter for optical recording medium capable of preventing diffuse reflection of an information beam and a reference beam from a reflective layer in the optical recording medium and preventing occurrence of noise without causing shift in selective reflection wavelength, and distortion in a reproduced image even when an angle of incidence is changed, and an optical recording medium capable of recording a high density image by using the filter. Specifically, the present invention relates to the optical recording medium containing a first substrate, a recording layer which records information by utilizing holography, an optical compensation layer, a filter layer, and a second substrate, in this order, and the filter layer is a cholesteric liquid crystal layer. | 03-05-2009 |
20090073850 | OPTICAL DATA STORAGE DEVICE - The present invention aims to provide an optical data storage device capable of not only recording digital information by using holography, but also recording or reproducing information onto or from conventional optical discs represented by BD. In the optical data storage device of the present invention, a single light source is used for generation of both an optical beam for holographic medium curing and an optical beam for recording or reproducing information onto or from a BD or an HD DVD. Furthermore, the optical beam for holographic medium curing and the optical beam for recording or reproduction of information onto or from a BD or an HD DVD are designed to go through optical paths partly including a common optical path. In this configuration, multiple optical system configurations can be reasonably placed together into a single case. | 03-19-2009 |
20090073851 | APPARATUS AND METHOD FOR RECORDING/REPRODUCING HOLOGRAPHIC DATA AND HOLOGRAPHIC DATA STORAGE MEDIUM - A method and apparatus for recording and/or reproducing holographic data and a holographic information storage medium, wherein the apparatus for recording and/or reproducing holographic information includes an optical pickup emitting light onto a holographic information storage medium and receiving the emitted light. The optical pickup includes: a light source unit emitting a signal beam and a reference beam in a recording mode; and a focusing optical system focusing the signal beam and the reference beam on one focal point in the holographic information storage medium so that information can be recorded by using an interference pattern formed along a depth direction of the holographic information storage medium in the vicinity of the focal point, wherein the numerical aperture of the focusing optical system for the signal beam is different from the numerical aperture of the focusing optical system for the reference beam. | 03-19-2009 |
20090073852 | APPARATUS AND METHOD FOR RECORDING/REPRODUCING HOLOGRAPHIC DATA - An optical pickup of a holographic data recording/reproducing apparatus that emits light to a reflective holographic data storage medium in which a substrate, a reflection layer, a recording layer, and a cover layer are sequentially stacked, and receives the emitted light, the optical pickup including: a first light source unit to emit, during a recording operation, a signal beam having a first polarization and a reference beam having a second polarization perpendicular to the first polarization along the same optical path; and a main lens unit having a refractivity that varies according to a polarization of a passing light, so as to cause the signal beam to be reflected from the reflection layer then focused on a focal point, and to cause the reference beam to pass through the cover layer then be directly focused on the focal point | 03-19-2009 |
20090080313 | Optical Information Recording and Reproducing Device - The optical information recording and reproducing device utilizing holography requires the optical system to generate the signal beam and the reference beam to be irradiated to the holographic storage medium as well as another optical system to generate the curing light beam to be irradiated to the holographic storage medium. Furthermore, from the viewpoint of backward compatibility, if the same device is used for recording or reproduction on the conventional optical discs represented by Blu-ray Disc, another optical system adaptable to recording and reproduction on these optical disks is required. This means the optical system configurations become complicated and larger in size. One solution for downsizing is to use the reference beam also as the curing light beam. Another way is sharing of optical path for curing light beam and for the reference beam. Furthermore, it is possible to share the light source for generating the curing light beam and for generating the recording or reproducing light beam. In such way, optical system configurations become simple. | 03-26-2009 |
20090080314 | OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS AND ITS REPRODUCTION METHOD - An optical recording/reproducing apparatus includes an optical recording medium in which a holograms are recorded depending on an incident angle of a reference beam. The reference beam is irradiated to holograms while changing the incident angle to generate a reproduction light beam, and an image patterns are detected by an image pattern detector. The continuously output reproduction image patterns are temporarily stored in an image recorder, and the maximum value of reproduction light intensity is detected to generate a trigger signal. Depending on the trigger signal, an optimal image pattern is extracted from continuous reproduction image patterns, and thus, two-dimensional data is decoded. | 03-26-2009 |
20090080315 | OPTICAL INFORMATION RECORDING AND REPRODUCING APPARATUS AND METHOD OF OPTICALLY RECORDING AND REPRODUCING INFORMATION - An optical recording and reproducing apparatus according to the present invention utilizes an angle multiplexing interfering method to record multiple pieces of recording data on an optical recording medium. Recording conditions for the multiple recording and management information such as addresses are recorded in the same book according to a coaxial interfering method. In a reproduction mode, the management information is read from a hologram formed according to the coaxial interfering method. The management information is utilized to quickly read the recording data from a hologram formed according to the angle multiplexing interfering method. | 03-26-2009 |
20090080316 | Optical Information Recording and/or Reproducing Apparatus - An optical information recording and/or reproducing apparatus is provided which can, with the help of the same apparatus, record information on both an information recording area of an information recording medium for hologram and an information recording area of an existing optical disc typified by BD, DVD or CD and/or reproduce the information recorded on both the information recording areas. The optical information recording and/or reproducing apparatus performs recording and/or reproduction of information on and/or from a hologram memory disc and an optical disc by means of an optical pickup and has a stepping motor for driving the hologram memory disc and a DC motor for driving the optical disc. | 03-26-2009 |
20090080317 | DEVICES FOR STORING AND READING DATA ON A HOLOGRAPHIC STORAGE MEDIUM - In one embodiment, the invention provides a device for storing data on a holographic storage medium, comprising means for generating an object beam encoded by spatial modulation with the data to be stored, and means for generating a reference beam spatially modulated according to predetermined configurations to produce a multiplexing of the data, comprising an optical storage medium on which is implemented a succession of diffractive optical elements, each introducing a distinct modulation configuration of the reference beam. The invention further provides a device for reading the duly-stored data, using an optical storage medium of the same type for generating and spatially modulating a read beam, and a device for replicating a first holographic storage medium on a second holographic medium, comprising such a reading device coupled to such a storage device. | 03-26-2009 |
20090086604 | Optical Recording Method, Optical Recording Apparatus and Optical Recording Medium - To provide an optical recording method, optical recording apparatus and optical recording medium, capable of effective control of light irradiation position, such as focusing control or tracking control, at the time of recording or reproducing and efficiently adjusting the light irradiation position control according to variations in distance between layers in an optical recording medium or according to manufacturing errors in optical recording and reproducing apparatus, the method including applying at least one of an information light and a reference light to an optical recording medium for detection and control of focus positions of the information light and reference light in a thickness direction of the optical recording medium; and applying the information light and reference light to form an interference image to be recorded in a recording layer provided in the optical recording medium, wherein information is recorded in the recording layer by holography. | 04-02-2009 |
20090086605 | Hologram Recording and Recovering Device and Holographic Recording and Recovering Method - An object of this invention is to achieve a hologram information recording and recovering device using an angle multiplexing method capable of reducing crosstalk from an adjacent hologram. When a set of incident angles of reference light on a disc in recording a hologram using the angle multiplexing method is expressed by {θ}=[θ | 04-02-2009 |
20090086606 | Optical Information Recording/Reproducing Apparatus and Disk Distinction Method - An optical information recording/reproducing apparatus includes an optical source unit that emits an optical beam toward an optical information recording medium mounted on the apparatus, an optical receiving unit that receives a reflected beam of the optical beam reflected from the optical information recording medium or a transmitted beam of the optical beam transmitted through the optical information recording medium to output an output signal in response to the reflected beam or transmitted beam, and a distinction unit that discriminates whether the optical information recording medium is a hologram disk for recording information by using a holography or a reflection-type optical disk for reproducing information by virtue of the reflected beam, in accordance with the output signal output. | 04-02-2009 |
20090086607 | Optical Information Recording and Reproducing Apparatus - The invention provides an optical information recording and reproducing apparatus which can record and/or reproduce an information on both a holographic storage disc and a conventional optical storage disc, can improve a usability, and can achieve a downsizing and a low cost. The optical information recording and reproducing apparatus can record and reproduce an information on both a holographic storage disc and an optical storage disc recording and/or reproducing the information at a time of a high speed turning, by an optical pickup, and is provided with a stepping motor driving the holographic storage disc, and a direct-current motor driving the optical storage disc, and a rotating shaft of the stepping motor and a rotating shaft of the direct-current motor are constituted by a common rotating shaft. | 04-02-2009 |
20090097378 | DATA TRANSMISSION OPTICAL DEVICE COMPRISING A SOURCE EMITTING A LASER BEAM - The present invention relates to a data transmission optical device including a source emitting a laser beam for transmitting the data toward an optical sensor. The device has means for collimating the beam. It may be implemented on board an aircraft for transmitting audio or video data to the passenger seats. The device has applications for on-demand video. | 04-16-2009 |
20090097379 | HOLOGRAM DEVICE - In a hologram device, a reflecting mirror is provided on a light path of reproduction light, the reproduction light is oriented in a direction parallel to an optical recording medium, and, then, a light-receiving member receives the light. Since the light-receiving member need not be provided in a thickness direction, even if a light path length is increased, the hologram device can be made thin. In addition, by using the reflecting mirror having a very small area, it is possible to restrict crosstalk even without a pinhole. Further, a light-receiving device is accommodated in a housing, and the reproduction light is incident upon the interior of the housing through a transparent cover, so that it is possible to prevent entry of dust. | 04-16-2009 |
20090103415 | OPTICAL RECORDING METHOD, OPTICAL RECORDING APPARATUS, OPTICAL RECORDING MEDIUM, AND OPTICAL RECORDING AND REPRODUCING METHOD - The present invention aims to provide an optical recording method etc. that provides higher efficiency of recording and reproducing and is uninfluenced by the mismatch of optical axes of plural laser lights induced from accident errors of optical recording and optical reproducing apparatuses when carrying out recording or reproducing, or focus control etc. by use of a laser light, high multiple-recording can be carried out, and layer construction of the recording medium itself is simple. | 04-23-2009 |
20090103416 | LAYOUT METHOD FOR MULTIPLEXED HOLOGRAMS - Methods are disclosed for determining the layout of cure sites/cure spots and/or stack positions on the recordable section of a holographic storage medium. Also disclosed are methods for carrying out pre-curing and stack writing routines for pre-curing, in an appropriate order, bookcases comprising such cure spots in the recordable section, and for writing stacks of holograms, in an appropriate order, to such bookcases after determining such layouts. | 04-23-2009 |
20090129233 | Shift-insensitive storage of information in page oriented optical data storage systems - A data page for optical data storage for an optical storage system, i.e. a holographic storage system, is presented. The data page includes one or more areas, which are less sensitive against a movement of the data page in a movement direction of the storage medium. A holographic storage medium comprising such data pages is presented. An apparatus for reading from and/or writing to an optical medium comprising such data pages, and to a method for reading and/or writing such data pages is presented. | 05-21-2009 |
20090129234 | HOLOGRAM RECORDING DEVICE AND HOLOGRAM RECORDING METHOD - A hologram recording device illuminates with a recording beam (S) a hologram recording medium (B), and illuminates with a reference beam (R) a region illuminated with the recording beam (p) while variably controlling the incident angle regarding the hologram recording medium (B) whereby holograms are recorded on the illuminated region (p) in multiple by interference of the recording beam (S) and the reference beam (R). The device includes an incident angle variable controller for variably controlling the incident angle of the reference beam (R) in a predetermined range. The hologram recording medium (B) has such characteristics that its recording sensitivity degrades as the incoming light amount increases. The incident angle variable controller changes the incident angle of the reference beam (R) from a larger angle to a smaller angle. | 05-21-2009 |
20090135703 | HOLOGRAPHIC RECORDING MEDIUM - This invention is a holographic recording medium including a track in which position information to specify a recording position and a reproducing position of page data is formed. The position information of the track is formed of position detection patterns. The position detection patterns each including a first detection mark row including center pits arranged at predetermined intervals; and a second detection mark row including side marks arranged at the same intervals as the intervals of the center pits, the side marks having lengths substantially corresponding to integral multiples of the intervals of the center pits. The second detection mark row is arranged adjacent to the first detection mark row such that both ends of the side marks are arranged so as to correspond to the center pits in a track width direction, and page data is recorded and reproduced on the basis of positions of the center pits or positions of the ends of the side marks. | 05-28-2009 |
20090141612 | HOLOGRAM REPRODUCING APPARATUS AND HOLOGRAM REPRODUCING METHOD - Almost all regions of a liquid crystal element | 06-04-2009 |
20090141613 | HOLOGRAM APPARATUS - A light-shielding member having a pinhole filter is disposed at a boundary between reference light emitted from a light source and reproduction light output from a holographic recording medium. The reproduction light passes through a pinhole formed on the pinhole filter and enters a light-shielded space in which a photodetector member is disposed. The pinhole is disposed at a position of a beam waist BW at which the beam diameter is at a minimum. Therefore, the photodetector member is prevented from detecting light other than the reproduction light. The pinhole filter includes the transparent substrate as a base material, and therefore blocks dust from entering the light-shielded space. | 06-04-2009 |
20090147653 | Holographic content search engine for rapid information retrieval - An apparatus for information retrieval comprising a first holographic drive, configured to content-search holographic recording media (HRM), and to generate an address, and at least one data storage system, configured to receive the address generated by the first holographic drive and operable to retrieve information from said data storage system corresponding to the address received from said first holographic drive. | 06-11-2009 |
20090147654 | Sync mark correction for holographic data pages - The presented invention relates to a method for reading data from a data page from an optical data storage medium, e.g. a holographic storage medium and to an apparatus for performing this method. At least one missing or wrong positioned sync mark on a read data page is identified and its corrected position is estimated. The estimated corrected sync mark position is used for further processing. | 06-11-2009 |
20090161516 | METHACRYLATE-BOUND PHOTOISMERIZABLE CHROMOPHORE, METHODS FOR ITS SYNTHESIS AND OF ITS INTERMEDIATES - The invention discloses novel dicyanostilbene derivatives bound to a methacrylic moiety that can serve as an active chromophore in a 3-dimensional optical memory, processes for its synthesis and its intermediates. | 06-25-2009 |
20090161517 | Optical imaging device and optical sensor thereof - An optical imaging device and an optical sensor thereof are described. The optical sensor is used for sensing a signal light. The optical sensor includes a plurality of photosensitive pixels and at least one absorption wall. The absorption wall is disposed between the photosensitive pixels, and a top of the absorption wall is higher than photosensitive surfaces of the photosensitive pixels. Herein, the photosensitive pixels are used for receiving an incident signal light, and the absorption wall is used for absorbing non-parallel light components in the signal light. | 06-25-2009 |
20090161518 | Holographic recording medium and pickup for this medium - A holographic recording medium with an improved servo structure is presented. The holographic recording medium has a hologram layer for storing holograms and a servo layer for positioning a light beam for reading and/or recording of a hologram relative to the holographic recording medium. The servo layer is an essentially flat dye recording layer. A holographic pickup for use with such a holographic recording medium includes a light source for generating a light beam, which interacts with the dye recording layer for recording servo information. | 06-25-2009 |
20090161519 | OPTICAL INFORMATION RECORDING APPARATUS AND METHOD - An optical information recording apparatus includes a light source that emits an irradiation beam; a spatial light modulator that converts the irradiation beam to an information beam, the information beam having a two-dimensional modulation pattern that carries information and is formed with a plurality of first regions in which each of boundaries is formed with OFF pixels; a phase modulator that includes a plurality of second regions, and that imparts the phases to the irradiation beam or the information beam to modulate phases of the irradiation beam or the information beam; and a light collector that collects the information beam and a reference beam on an optical information recording medium that can record the information as hologram, by using interference fringes produced due to interference between the information beam and the reference beam. | 06-25-2009 |
20090168628 | OPTICAL PICKUP APPARATUS - An optical pickup apparatus for use with a semiconductor laser which outputs a light beam, the optical pickup apparatus has;
| 07-02-2009 |
20090168629 | HOLOGRAPHIC INFORMATION RECORDING AND/OR REPRODUCING APPARATUS - A holographic information recording and/or reproducing apparatus including: a light source unit emitting reference light and signal light; a first optical path guiding unit guiding the lights to cross; a second optical path guiding unit including a first polarization converter located on an optical path of one of the reference and signal lights, a first polarization beam splitter located at a crossing point of the reference light and the signal light, an optical path converter guiding the reference light and the signal light so that they cross again, a second polarization converter located on an optical path of the signal light before the signal light crosses the reference light, and a second polarization beam splitter uniting the optical paths of the reference light and the signal light; and an objective lens unit illuminating the reference light and the signal light onto one side of a holographic information storage medium. | 07-02-2009 |
20090168630 | METHOD FOR DETECTING PATTERN OF OVER-SAMPLING IMAGE AND AN OPTICAL INFORMATION PROCESSING APPARATUS AND METHOD USING THE SAME - Provided are a method for detecting a pattern of an over-sampling image and an optical information processing apparatus and method using the same. A method for detecting a pattern from an image of an over-sampled datapage includes: over-sampling the datapage to detect a detection image of the datapage; comparing the detection image and a reference image of over-sampling for the pattern by a covariance; and calculating a pixel of the pattern over-sampled by values of the reference image and the detection image compared by the covariance. Accordingly, data with a specific pattern such as a mark can be detected from an image of an over-sampled datapage, thereby making it possible to increase the data reproduction accuracy, thus making it possible to greatly increase the reliability of reproduced optical data. | 07-02-2009 |
20090175148 | Holographic system, in particular for holographic data storage - In order, in the case of a holographic system, in particular for holographic data storage, comprising a radiation source for emission of a radiation an objective lens, a signal evaluation means, a detector and an optical data storage medium, the optical data storage medium having at least one data carrier layer and at least one beam-reflecting layer, to provide a solution which forms a small, compact and robust unit, in the case of which the signal beam crosses the reference beam only once, which avoids the use of optical beam splitters and requires a minimal alignment outlay, it is proposed that the objective lens has a plurality of sections, at least two beams that run parallel passing through the objective lens in a respective section and the at least two beams focusing at respectively separate locations on a plane in the optical data storage medium, at least one beam reflected in the optical data storage medium passing through the objective lens again in a respective further section. | 07-09-2009 |
20090175149 | HOLOGRAPHIC INFORMATION RECORDING AND/OR REPRODUCING APPARATUS - A holographic information recording and/or reproducing apparatus includes a light pickup optical system and a recording power control unit. The light pickup optical system illuminates reference light and signal light onto an information storing medium. The recording power control unit controls the light pickup optical system such that recording power of the reference light is the same as that of signal light. | 07-09-2009 |
20090185470 | ADVANTAGEOUS RECORDING MEDIA FOR HOLOGRAPHIC APPLICATIONS - High performance media suitable for recording with a blue laser is disclosed. The blue-sensitized holographic media provides greater dynamic range and higher sensitivity than previously disclosed blue-sensitized holographic media. These media can be used for diverse applications such as data storage where the articles provide denser data storage and more rapid hologram writing times or for optical waveguides where the articles provide greater optical confinement and more rapid manufacturing times. | 07-23-2009 |
20090196143 | Method and System for Command-Ordering for a Disk-to-Disk-to-Holographic Data Storage System - A system, method and computer program product for managing command ordering for a host-Disk-to-intermediate-Disk-to-Holographic (D2D2H) data storage system. Specifically, a command ordering detects a command from a host system. A hologram segment associated with the detected command is identified and a determination is made whether the hologram segment is an open hologram segment or a closed hologram segment. A determination is made whether the detected command is to be prioritized. If the detected command is prioritized, the detected command is added to a prioritized command queue. Moreover, if the detected command is not prioritized, the detected command is added to a normal command queue. The detected commands addressing the same hologram segment are then grouped. The execution of one or more grouped commands (prioritized or normal) is deferred for a predetermined period to allow for additional commands to be received for a same command group. | 08-06-2009 |
20090196144 | Method and System for Command-Ordering and Command-Execution Within a Command Group for a Disk-to-Disk-to-Holographic Data Storage System - A system, method and computer program product for managing command ordering and command execution for a host-Disk-to-intermediate-Disk-to-Holographic (D2D2H) data storage system. Specifically, a command ordering and execution (COE) utility selects the command group from a command queue. A determination is made whether the command group includes a write command for writing an entire hologram segment. Responsive to a determination that the command group does not include the write command for writing the entire hologram segment, the entire hologram segment is read to an intermediate system disk. Conflicting commands are then sorted from non-conflicting commands. Specifically, all conflicting write commands are executed before all conflicting read commands. After execution, the entire hologram segment of the intermediate system disk is closed and written in holographic medium. | 08-06-2009 |
20090196145 | OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS, OPTICAL INFORMATION REPRODUCING APPARATUS, AND OPTICAL INFORMATION RECORDING MEDIUM - An optical information recording/reproducing apparatus includes an irradiation optical system of an information beam to an optical information recording medium that can record information as hologram by using interference fringes produced due to interference between the information beam that carries the information and a reference beam; a first light-reducing element placed in an optical path of the irradiation optical system of the information beam and reduces light intensity of part of the information beam; a detector that detects a reproduction beam emitted from the optical information recording medium; and a second light-reducing element placed in an optical path of the reproduction beam extending from the optical information recording medium to the detector, and that reduces light intensity of the reproduction beam emitted from a first area other than a second area, in which information is recorded with the information beam of which light intensity is reduced by the first light-reducing element. | 08-06-2009 |
20090201782 | HOLOGRAPHIC DISK WITH OPTICAL-NOTCH-FILTER LABEL - A holographic disk, including: a holographic recording layer and a servo-tracking layer, the holographic recording layer separated from the servo-tracking layer by a dichroic mirror that prevents a data I/O laser from accessing the servo-tracking layer while allowing a servo-tracking laser to access embedded servo tracks; a transparent cover layer including at least one layer of optical notch filter that forms a label, the optical notch filter blocking light at a wavelength different from the data I/O laser and the servo-tracking laser; where the label is a color label including at least one of numbers, letters, descriptive figures, pictures, and barcodes. | 08-13-2009 |
20090201783 | APPARATUS AND METHOD TO SET A ROTATION RATE FOR AN OPTICAL AND HOLOGRAPHIC DATA STORAGE MEDIUM - A method to set a rotation rate for an optical holographic data storage medium by determining if the optical storage layer comprises an alternating series of lands and grooves. If the optical storage layer does not comprise an alternating series of lands and grooves, the method rotates the optical holographic data storage medium at a rotation rate based upon a data acquisition rate for pit-recorded information. If the optical storage layer comprises an alternating series of lands and grooves and the distance between alternating grooves increases as a function of the distance from said center point, then the method rotates the optical holographic data storage medium at a constant angular velocity. If the distance between alternating grooves does not increase as a function of the distance from said center point, then the method rotates the optical holographic data storage medium at a constant linear velocity. | 08-13-2009 |
20090201784 | APPARATUS AND METHOD TO STORE AND RETRIEVE INFORMATION USING AN OPTICAL HOLOGRAPHIC DATA STORAGE MEDIUM - A method using an optical holographic data storage medium and an optical holographic data storage drive, comprising removeably disposing the optical holographic data storage medium in the optical holographic data storage drive, and determining whether to write information to the holographic data storage layer, and/or whether to read information from the holographic data storage layer, and/or whether to write information to the optical data storage layer, and/or whether to read information from the optical data storage layer. The optical holographic data storage medium comprises a holographic data storage layer and an optical data storage layer. The optical holographic data storage drive comprises a reflective spatial light modulator, a first lasing device, a first optical detector for detecting first laser light, a second lasing device, and a second optical detector for detecting second laser light. | 08-13-2009 |
20090207714 | HOLOGRAM RECORDING/REPRODUCING OPTICAL ELEMENT AND HOLOGRAM RECORDING/REPRODUCING DEVICE - An optical element for recording/reproducing a hologram condenses a recording beam into a hologram recording medium, while also allowing the passage of a reproduction beam from the hologram recording medium in the reverse direction with respect to the recording beam. The optical element is configured to converge, upon incidence of a parallel beam flux as the recording beam, an on-axis beam and off-axis beams contained in the parallel beam flux onto different image points. A beam condensing spot of the on-axis beam and the off-axis beams is formed, with a predetermined diameter at a predetermined position on an optical axis on a way to the image points. At least one of the on-axis beam and the off-axis beams has a diameter, at the predetermined position on the optical axis, smaller than the predetermined diameter of the beam condensing spot. | 08-20-2009 |
20090219798 | REPRODUCTION METHOD AND HOLOGRAM RECORDING MEDIUM - Disclosed is a reproduction method for a hologram recording medium on which information is recorded with interference fringes of signal light and reference light, including: generating, based on light from a first light source, the reference light and coherent light caused to have uniform amplitude and phase, and irradiating the hologram recording medium with the reference light and the coherent light, the hologram recording medium including a recording layer on which the information is recorded with the interference fringes of the signal light and the reference light, a first reflection film formed on a lower surface side of the recording layer, and a gap layer formed between the recording layer and the first reflection film; and receiving the coherent light and a reproduction image that corresponds to recording information and is obtained as reflection light from the hologram recording medium through light irradiation in the light irradiation step, and reproducing the information based on a result of the light received. | 09-03-2009 |
20090231979 | OPTICAL RECORDING MEDIUM - An optical recording medium is provided, which includes a recording layer includes a polymer matrix, a polymerizable compound, a photopolymerization initiator, and a polymerization inhibitor. The polymerization inhibitor is formed of a compound which exhibits a molar absorption coefficient of zero to a light having a first wavelength and generates an acid or a base when exposed to an external stimulus other than the light having the first wavelength, thereby inhibiting the polymerization of the polymerizable compound. | 09-17-2009 |
20090231980 | OPTICAL DISC ASSEMBLIES FOR PERFORMING ASSAYS - This invention relates to an optical disc assembly capable of receiving an insert upon which an analyte of interest may be disposed. The optical disc assembly can be read by an optical disc reader, such as by a standard CD or DVD reader, and the analyte disposed on the insert can be detected by the optical disc reader. The optical disc assembly may have one or more data layer in which operational information ox assay information is encoded. Hologram may be used to encode operational information or assay information. | 09-17-2009 |
20090238058 | MARKER SELECTION METHOD, SELECTION DEVICE, MARKER, HOLOGRAM RECORDING DEVICE AND METHOD, HOLOGRAM REPRODUCING DEVICE AND METHOD, AND COMPUTER PROGRAM - A marker selection method includes: a marker generation step for generating a marker defining a position reference when recording data according to the modulation rule of the hologram recording/reproduction; a calculation step for calculating a correlation value indicating the correlation between a template image indicating a maker and each of a first verification image containing the marker shifted by a predetermined pixel and a second verification image containing data; and a selection step for selecting such a marker that the peak of the correlation value in the first verification image becomes greater than the peak of the correlation value in the second verification image. The selected marker is used as marker data in a marker generator in a recording processing circuit during recoding and as template data of the template matching processing circuit in the reproduction processing circuit during reproduction. | 09-24-2009 |
20090238059 | HOLOGRAPHIC RECORDING MEDIUM AND ENCODING/DECODING METHOD THEREOF - A holographic recoding medium is provided, having holographic pages. Each page has reference mark (RM) placement areas at fixed locations for placing RM patterns. The reference marks are used to calibrate data images of data areas each of which is enclosed by at least three RM regions. Hidden information of the medium is stored by an specific encoded pattern based on existence, types and arrangements of the RM marks. | 09-24-2009 |
20090238060 | OPTICAL REPRODUCING DEVICE AND OPTICAL REPRODUCING METHOD - There is provided an optical reproducing device including: a reproducing component that includes a light source, a spatial light modulator, and a light guiding component, with the reproducing component irradiating, with reference light that has been generated by the spatial light modulator as reading light, a Fourier transform hologram; a splitting component disposed on a signal light exiting side of the reproducing component and that splits, into two light waves, the signal light; a first image acquiring component that detects the one split light wave to acquire a first reproduced image; a second image acquiring component that detects light where a direct current component has been removed from the other split light wave to acquire a second reproduced image; and a decoding component that uses the first reproduced image and the second reproduced image to decode data that the signal light has. | 09-24-2009 |
20090257337 | OPTICAL INFORMATION RECORDING AND REPRODUCING APPARATUS - An optical information recording and reproducing apparatus includes an optical pickup, a phase conjugate optical system, a disc cure optical system, and a defect discrimination optical system; and an optical detector that receives a light emitted from the defect discrimination optical system and transmitted through or reflected from an optical information recording medium. A reference light and a signal light emitted from the optical pickup are irradiated onto the optical information recording medium to record and reproduce digital information by using a holography. | 10-15-2009 |
20090262628 | HOLOGRAM RECORDING APPARATUS AND METHOD, COMPUTER PROGRAM, AND HOLOGRAM RECORDING MEDIUM - A hologram recording apparatus ( | 10-22-2009 |
20090279406 | HOLOGRAM RECORDING AND REPRODUCING SYSTEM - A hologram recording and reproducing system for recording or reproducing information to or from a hologram record carrier that stores an optical interference pattern of a reference beam and a signal beam therein as a diffraction grating, includes: light producing means that generates a reference beam and a signal beam based on a coherent beam in which the coherent beam is modulated into the signal beam according to information to be recorded; interference means that allows one of the reference and signal beams to propagate axially on an optical axis as a central region light flux and allows the other of the reference and signal beams to propagate coaxially and annularly in section as an annular region light flux surrounding the one spatially separated from the other in a same direction and converges both the reference beam and the signal beam on different focal points in the optical axis respectively through an objective lens optical system to cause interference between the reference beam and the signal beam; a hologram record carrier having a hologram record layer located on a side of a near one of the different focal points to the objective lens optical system and a reflection layer located on a side of a distant one of the different focal points from the objective lens optical system; and image detecting means arranged on the optical axis and for receiving a beam returning from the hologram record layer through the objective lens optical system when the reference beam is illuminated to the hologram record layer; wherein the hologram record carrier further comprising a servo guide layer which is placed at a position either nearer to the objective lens optical system than the hologram record layer or farther than the reflection layer from the objective lens optical system. The hologram recording and reproducing system further includes a servo control system for focusing a servo beam onto the servo guide layer and for receiving a reflection light returning from the servo guide layer to photoelectrically convert it to a signal and for driving the objective lens optical system in accordance with the signal photoelectrically converted, wherein the servo beam has a wavelength different from the coherent beam wavelength and passes through the central region coaxially with the central region light flux including the optical axis. | 11-12-2009 |
20090279407 | SETUP FOR STORING DATA IN A HOLOGRAPHIC STORAGE MEDIUM - The present invention relates to a setup for storing data in a holographic storage medium, comprising a spatial light modulator medium ( | 11-12-2009 |
20090290471 | RECORDING AND REPRODUCING DEVICE, RECORDING AND REPRODUCING METHOD, RECORDING DEVICE, RECORDING METHOD, REPRODUCING DEVICE, AND REPRODUCING METHOD - A recording and reproducing device performs recording and reproduction on a hologram recording medium on which data is recorded by the use of interference fringes formed by signal light and reference light. The device includes: a light generation device including a spatial light modulator which performs spatial light modulation on incident light, and generating the signal and reference lights in the recording and the reference light in the reproduction; an image sensor for receiving the incident light and obtaining a light reception signal; an optical system for guiding the signal and reference lights to the hologram recording medium and reproduction light to the image sensor; and a band limiting device inserted on a Fourier plane in an optical path of the optical system, and having a transmittance set to be lower in a central area thereof than in a peripheral area thereof, to perform band limitation on the incident light. | 11-26-2009 |
20090290472 | Optical information recording apparatus, optical information recording method, optical information recording/reproducing apparatus and optical information recording/reproducing method - An optical information recording/reproducing apparatus using holography comprises a signal generation unit that modulates input data, adds at least one control bit to each group of N bits, performs an NRZI-modulation on the modulated data, determines the at least one control bit such that a digital sum value of the NRZI-modulated data is 0, performs NRZI modulation on the data whose at least one control bit was determined, and rearranges the data to generate 2-dimensional data; a pickup that records the 2-dimensional data in a hologram disc and reproduces the 2-dimensional data from the hologram disc; and a signal processing unit that corrects the 2-dimensional data reproduced by the pickup, performs NRZI-modulation on the 2-dimensional data that has undergone a binarization operation, removes the at least one control bit added during the recording, and demodulates the data according to a modulation rule used during the recording. | 11-26-2009 |
20090296557 | OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS - There is provided an optical information recording/reproducing apparatus having an optical disc drive unit for driving an optical disc mounted, a hologram disc drive unit for driving a hologram disc mounted, a disk discrimination device for discriminating which of an optical disc and a hologram disc was mounted, a selection device of the disk drive unit for selecting an optical disc drive unit, when discriminated to be an optical disc, by the disk discrimination device, while selecting a hologram disc drive unit, when discriminated to be a hologram disc, by the disk discrimination device, and a drive device of the disk drive unit for driving the disk drive unit selected by the selection device of the disk drive unit. | 12-03-2009 |
20090296558 | Optical information recording and reproducing apparatus optical information recording method - An optical information recording and reproducing apparatus includes an irradiation unit of a signal light beam and a reference light beam required for data recording, and a cure irradiation unit having at least one of a pre-cure irradiation that irradiates a predetermined light beam on to a desired position prior to irradiating the reference light bean and the signal light beam on to the desired position when information is recorded in the desired position on an optical information recording medium and a post-cure irradiation that irradiates a predetermined light beam on to the desired position so as to make the desired position non-recordable after the information is recorded in the desired position on the recording medium. The cure irradiation unit is disposed in one driving device in a freely movable manner in the driving device. | 12-03-2009 |
20090303856 | OPTICAL STORAGE MEDIUM AND OPTICAL INFORMATION APPARATUS - Disclosed is an arrangement that enables to keep a relative positional relation between a beam for servo control and a beam for information recording/reproduction constant concerning focusing control and tracking control, even if the two beams are different from each other. An optical storage medium has a reflection surface for reflecting a first beam having a first wavelength, and reflecting a second beam having a second wavelength different from the first wavelength; and an information storage layer for recording information as an interference pattern by incidence of the first beam, or reproducing the information from a wave surface based on the interference pattern. The reflection surface is formed with plural marks or guide grooves usable in a tracking operation or a focusing operation by irradiation of the second beam. The information storage layer is partially formed, in advance, with a reference interference pattern which is reproduced when the first beam is irradiated, and which is used as a reference for correcting the relative positional relation between the first beam and the second beam. | 12-10-2009 |
20090310462 | FRUSTUM-SHAPED HOLOGRAPHIC DISC AND MATCHING TRAY IN A HOLOGRAPHIC DRIVE - A holographic disc comprises a multilayer right-circular frustum. The frustum includes a substrate layer having an inner surface and an outer surface. A reflective track layer is formed on the inner surface of the substrate layer. A first gap layer overlies the reflective track layer. A dichroic mirror layer overlies the first gap layer. A second gap layer overlies the dichroic mirror layer. A holographic recording layer overlies the second gap layer. A cover layer overlies the holographic recording layer. The cover layer has an inner surface in contact with the holographic recording layer and an outer surface. The frustum has a major diameter and a minor diameter. In one embodiment of the multilayer right-circular frustum, the outer surface of the said outer surface of the cover layer defines the minor diameter and the outer surface of the substrate layer defines the major. In another embodiment, the outer surface of the substrate layer defines the minor diameter and the outer surface of said the cover layer defines the major diameter. | 12-17-2009 |
20090310463 | OPTICAL INFORMATION RECORDING APPARATUS AND OPTICAL INFORMATION RECORDING METHOD - A need to effectively record data of various sizes on a large-capacity holographic memory capable of high-speed recording is achieved, for example, by curing a first part of the holographic recording which is able to be multiplex-recorded in one or more units of a predetermined volume, and by not recording/curing a second part which is not able to be multiplex-recorded in a predetermined volume at a timing when the first recording part is cured. Also the above need can be achieved by, another example, by adding dummy data to the second part. Alternatively, the second part can be recorded on another track, in which it is possible to record in different units, e.g. by bit recording in a track that utilizes a DVD recording format. According to the present examples, we can record data of various sizes on the holographic memory effectively while performing large-capacity and high-speed holographic recording. | 12-17-2009 |
20090316558 | TWO-DIMENSIONAL DEMODULATION METHOD, TWO-DIMENSIONAL DEMODULATION APPARATUS AND HOLOGRAPHIC APPARATUS - A two-dimensional demodulation method for reproducing a data page by means of decision feedback Viterbi detection processing from a recording medium on which a data page has been recorded as a set of a plurality of two-dimensional modulation pattern symbols each of which comprises a plurality of pixels, and which have been modulated two-dimensionally, the method comprising: a step of determining a value of pixel deviation in a reproduction image obtained by receiving light from the recording medium on an image sensor; a step of splitting an output signal of the image sensor which indicates the reproduction image of the light received from the recording medium into signal symbol data by division into blocks in accordance with the two-dimensional modulation pattern symbols; and a step of carrying out decision feedback Viterbi detection for each signal symbol data in accordance with the pixel deviation value. | 12-24-2009 |
20090316559 | Optical information recording apparatus, optical information recording method, optical information reproducing apparatus and optical information reproducing method - An optical information recording/reproducing apparatus and an optical information recording/reproducing method that record information using holography, wherein the optical information recording/reproducing apparatus includes a signal generation unit that generates two-dimensional data by a two-dimensional encoding method in which a lower-limit value of a number of continuous ON/OFF pixels in an array in one direction of pixels in a two-dimensional spatial light modulator is K(K≧2, K: natural number); and a pickup that records the two-dimensional data, generated by the signal generation unit, on a hologram disc. | 12-24-2009 |
20090323500 | OPTICAL HOLOGRAPHIC DEVICE AND METHOD WITH ALINGNMENT MEANS - The present invention relates to an optical holographic device and a corresponding method for reading out a data page recorded in a holographic recording medium ( | 12-31-2009 |
20100008204 | MULTI-WAVELENGTH MICRO HOLOGRAPHIC DATA RECORDING/REPRODUCING APPARATUS - A multi-wavelength micro holographic data recording and/or reproducing apparatus in which decentering of light beams having different wavelengths is compensated for, the apparatus including: at least two light sources emitting the light beams; at least two photodetectors respectively detecting the light beams reflected from an optical recording medium; and an optical system guiding the light beams emitted from the light sources to the optical recording medium along a common optical path and guiding the light beams reflected from the optical recording medium to corresponding photodetectors, wherein the optical system includes: an objective lens focusing a light beam on the optical recording medium; a common decenter compensation member provided on the common optical path to adjust traveling angles of the light beams; and an individual decenter compensation member provided on an individual optical path of a light beam of individual wavelength to adjust a traveling angle of the light beam. | 01-14-2010 |
20100008205 | Optical pickup and optical device - An optical pickup includes a first laser beam light source | 01-14-2010 |
20100008206 | METHOD AND APPARATUS FOR RECORDING/REPRODUCING HOLOGRAPHIC INFORMATION - Provided are a method and apparatus for recording/reproducing holographic information. The apparatus for recording/reproducing holographic information includes an optical pickup which irradiates light on a holographic information storage medium and receives irradiated light, wherein the optical pickup comprises a focusing optical system having a numerical aperture (NA) during recording that is lower than the NA during reproduction. | 01-14-2010 |
20100014409 | HOLOGRAPHIC DATA STORING METHOD AND STORING DEVICE - A holographic data storing method includes the steps of: encoding original data to generate holographic data according to a codeword to symbol relation; and recording a hologram corresponding to the holographic data onto a holographic storage medium. In the codeword to symbol relation, a plurality of sample symbols corresponds to a plurality of codewords. Each of the sample symbols corresponds to a pattern having N*N pixels. There are M bright pixels in the N*N pixels, wherein N and M are positive integers and M is smaller than N*N. A hamming distance of the sample symbols is greater than or equal to 4, and a two-dimensional run-length of the sample symbols is greater than or equal to 2. | 01-21-2010 |
20100014410 | OPTICAL PICKUP AND OPTICAL DISK DEVICE - An optical pickup includes: a light source that emits a light beam; an object lens that condenses the light beam on a target recording layer of an optical disk; a lens moving unit; a condensing lens; a hologram element that diffracts, in diffracting a reflected light beam and separating it into reflected zeroth-order and first-order light beams, parts of the reflected first-order light beam in a first direction and sets them as first and second beams, diffracts parts of the reflected first-order light beam in a second direction and sets them as third and fourth beams; and a photodetector that receives the first and second beams and the third and fourth beams and generates light reception signals, and receives interlayer stray light of a part of the light beam reflected by the other recording layers other than the target recording layer and generates a stray light reception signal. | 01-21-2010 |
20100020669 | METHOD FOR HOLOGRAPHIC DATA RETRIEVAL BY QUADRATURE HOMODYNE DETECTION - Systems and methods are provided for recovering data in a holographic memory system. One embodiment of these systems and methods uses homodyne detection to introduce a local oscillator beam into a reconstructed data beam of the recovered hologram. An image of the combined beam comprising the reconstructed data beam and local oscillator beam may be processed to obtain contrast level information for the pixels of the detected image. This contrast level information may then be used to obtain an increased contrast image of the recovered hologram, which may increase the SNR of the recovered data. | 01-28-2010 |
20100027401 | RUN LENGTH LIMITED ENCODING OF DATA INTO A 5X5 MATRIX FOR RECORDING INTO A HOLOGRAPHIC MEDIUM - Holographic recording drives encode data for recording into a holographic medium. The steps comprise run length limited encoding three bytes of data into 5×5 matrix information, the data subject to a 4-byte error correction code; and providing the 5×5 matrix information to a spatial light modulator (SLM), as a portion of a two-dimensional pixel matrix of the spatial light modulator, for recording into a holographic image on the holographic medium. | 02-04-2010 |
20100039918 | HOLOGRAM RECORDING/REPRODUCING DEVICE, METHOD THEREOF, AND HOLOGRAPHIC RECORDING MEDIUM - A hologram recording/reproducing device includes an optical section which irradiates a holographic recording medium with an optical beam; and a control unit which controls the optical section. The optical section includes a laser light source which emits the optical beam, and a spatial modulator which modulates the optical beam. By controlling the spatial modulator, the control unit displays a tilt-standard reference light pixel and a tilt-standard signal light pixel, and records a tilt-standard hologram. | 02-18-2010 |
20100054103 | OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS AND METHOD - An optical information recording/reproducing apparatus includes a spatial light modulator that converts an irradiation beam emitted from a light source to a single information beam that carries information; an optical system that causes the single information beam to be collected on an optical-information recording medium including an information recording layer capable of recording the information as hologram by using interference fringes produced due to interference between the single information beam and a plurality of reference beams, and causes each of the reference beams to be irradiated to the optical-information recording medium from mutually different directions so as to intersect with the single information beam in the information recording layer; and a controller that controls to cause the light source to emit the irradiation beam and performs angular multiplexing recording of the information in the information recording layer while controlling to drive either one of the optical-information recording medium and the optical system. | 03-04-2010 |
20100054104 | HOLOGRAM RECORDING AND REPRODUCING DEVICE AND METHOD FOR RECORDING HOLOGRAM - A hologram recording and reproducing device controls an optical beam output from an external cavity semiconductor laser to improve a diffraction efficiency. The hologram recording and reproducing device includes an external cavity laser, a photodiode, a laser drive circuit and a laser diode controller. The external cavity laser has a laser diode adapted to emit an optical beam that is used to generate data light and reference light with which a hologram recording medium is irradiated. The photodiode detects the amount of the optical beam output from the external cavity laser. The laser drive circuit supplies a current to the external cavity laser. The laser diode controller controls the laser drive circuit to ensure that a value obtained by integrating the detected intensity of the optical beam with respect to time over a predetermined period is equal to predetermined recording energy. | 03-04-2010 |
20100061212 | METHOD AND DEVICE FOR OPTICAL RECORDING MEDIUM, AND OPTICAL RECORDING AND REPRODUCING APPARATUS - The present invention is to provide a method for treating an optical recording medium including irradiating a recording layer, which has recorded information, with a treatment light through a light diffusion member having a haze of 70% to 100%, wherein the optical recording medium contains at least the recording layer which records information using holography, and a device for treating an optical recording medium containing a light source for the treatment light, and the light diffusion member having a haze of 70% to 100% and disposed between the light source and the optical recording medium, wherein the recording layer is irradiated with the treatment light through the light diffusion member from the light source. The preferred aspects are that a half width of wavelength for an energy intensity of the treatment light is 5 nm to 700 nm; and the optical recording medium is a write-once read-many optical recording medium. | 03-11-2010 |
20100061213 | OPTICAL HOLOGRAPHIC DEVICE AND METHOD WITH GAIN COMPENSATION - The present invention relates to an optical holographic device and a corresponding method for reading out a data page recorded in a holographic recording medium ( | 03-11-2010 |
20100061214 | APPARATUS AND METHOD FOR THE PRODUCTION OF A HOLOGRAM IN AN OPTICAL MEDIUM - The invention relates to a method and a device for producing a hologram in an optical medium, particularly for storing data in the optical medium. In the method, the hologram is produced in the optical medium using laser beams, wherein the laser beams are formed from a laser beam emitted by a free-running semiconductor laser, are directed onto the optical medium, optionally contradirectionally, and at least partially spatially overlap in the optical medium. For producing holograms using inexpensive components with a high contrast, the invention provides for arranging the reflection unit ( | 03-11-2010 |
20100061215 | Optical Information Recording and Reproducing Apparatus and Optical Information Recording Apparatus - An optical information recording and reproducing apparatus for recording information on a recording medium by forming interference fringes generated by interference between an information beam and a reference beam on the recording medium and for reproducing the information by irradiating, with the reference beam, the recording medium, in which the interference fringes are formed. The apparatus includes a spatial light modulator for spatially modulating at least a portion of a light beam emitted from a light source into the information beam. A light sensing device reads the information beam extracted from the recording medium by the reference beam irradiated on the recording medium. A shift amount detector detects a shift of the irradiating position of the light beam entering the spatial light modulator, and a device corrects a positional shift between a position of an area for modulating the information beam and a position of the light beam in the spatial light modulator based on a positional shift amount detected by the shift amount detector. | 03-11-2010 |
20100074089 | METHOD FOR FINDING AND TRACKING SINGLE-MODE OPERATION POINT OF EXTERNAL CAVITY DIODE LASERS - An apparatus comprising: a processor for determining if a laser is operating in a single-mode state and for determining the degree to which one of one or more tunable parameters for the laser must be adjusted so that laser operates in a single-mode state if not operating in a single-mode state, wherein the one or more tunable parameters include the following parameters: the laser current and the wavelength of the output light. The apparatus may include a laser and/or a holographic storage medium. Also provided is a method for determining if a laser is operating in a single-mode state and for determining the degree to which one of one or more tunable parameters for the laser must be adjusted so that laser operates in a single-mode state if not operating in a single-mode state. | 03-25-2010 |
20100074090 | STORAGE SYSTEM AND OPTICAL PICK-UP UNIT - Disclosed herein are aspects of optical tape technology, tape manufacturing, and tape usage. Methods and systems of tape technology disclose optical tape media including: configurations, formulations, markings, and structure; optical tape manufacturing methods, systems, and apparatus methods and systems including: curing processes, coating methods, embossing, drums, testing, tracking alignment stamper strip; optical tape methods and systems including: pick up head adapted for the disclosed optical tape; and optical tape uses including optical storage media devices for multimedia applications | 03-25-2010 |
20100080103 | Information recording apparatus, information reproducing apparatus and recording media - An apparatus for recording information in an optical-information recording media by holography includes a signal-light irradiation unit, a reference-light irradiation unit, a reference light angle adjustment unit, and a positioning unit for positioning irradiation positions of the signal light and the reference light. The optical-information recording media is divided into N (N≧2) recording regions, M multiplexed information can be recorded in the respective recording regions by the reference light angle adjustment unit which changes the angle of the reference light at M angles (θ | 04-01-2010 |
20100080104 | Information recording/reproducing apparatus, apparatus for manufacturing optical information recording medium, and optical information recording medium - An optical information recording/reproducing apparatus equipped with a mechanism for moving an optical pickup to an arbitrary radial position of an optical information recording medium using holography. A total sum signal of signals is generated at the photodetector for receiving signals reproduced from the optical information recording medium, and a radial position of the pickup is obtained from the number of pulses in the total sum signal to thereby allow the pickup to move to an arbitrary radial position. | 04-01-2010 |
20100085859 | HOLOGRAM RECORDING AND REPRODUCING APPARATUS - A laser beam emitted from a laser light source is divided into two laser beams, a 2-dimensional spatial modulation is performed to one of the two divided laser beams based on recording information, the modulated laser beam is projected as signal light onto a recording medium, the other laser beam is projected as reference light onto the recording medium, and the recording information is recorded onto the recording medium. The recording information recorded on the recording medium is reproduced based on the laser beam transmitted through or reflected by the recording medium. An optical system includes: a rotatable mirror portion for guiding the reference light to the recording medium at an angle according to the direction of its reflecting surface; a vibration proofing member coupled with a rear surface of the mirror portion; and a driving mechanism which decides an angle position of the mirror portion and is coupled with the mirror portion. | 04-08-2010 |
20100091631 | PHASE MASKS FOR USE IN HOLOGRAPHIC DATA STORAGE - A spatial light modulator (SLM) having a phase mask that is provided as an internal component thereof. The phase mask can be provided as a multilevel surface of relatively higher index of refraction material on an inner surface of a transmissive cover window or as a separate transmissive window between the cover window and the pixels of the SLM. If the phase mask is to be used with a liquid crystal SLM, then it may be desirable to planarize the surface of the cover window contacting the liquid crystal by providing a layer of relatively lower index of refraction material adjacent the multilevel surface. The phase mask can also be provided on the transmissive cover window by patterned ion deposition, exposing patterned light to a photopolymeric material, or in some other suitable fashion. Arranging for the pixel electrodes to be at one of multiple levels rather than lying in an exactly planar relationship can also effectively create the phase mask. | 04-15-2010 |
20100097916 | Optical Disk, Recording/Reproducing Method Thereof, and Optical Disk Apparatus with Employment of Optical Disk - Then, in order to achieve the above-described object, in the optical disk of the present invention, while micro-hologram layers | 04-22-2010 |
20100103796 | METHOD OF READING A FOURIER HOLOGRAM RECORDED ON A HOLOGRAPHIC STORAGE MEDIUM AND A HOLOGRAPHIC STORAGE SYSTEM - The invention relates to a method for reading a Fourier hologram recorded on a holographic storage medium with a holographic storage system. The method comprises the steps of: —calculating a characteristic value from a detected image of a reconstructed Fourier hologram in at least two relative positions of a reference beam and said storage medium, each of the characteristic values being indicative of a misalignment of the reference beam and said storage medium at the respective relative position, —calculating a servo value from the measured characteristic values, —determining an aligned relative position of said reference beam and said storage medium by means of a predetermined servo function using the calculated servo value, —setting the relative position of the reference beam and said storage medium to said aligned relative position, and —detecting an image at said aligned relative position. The invention also relates to a holographic storage system for reading a Fourier hologram recorded on a holographic storage medium, said system comprising reference beam generating means, storage medium receiving means and a detector for detecting a reconstructed hologram. The system further comprises a servo control unit for executing the method according to the invention. | 04-29-2010 |
20100118682 | APPARATUS AND METHOD FOR RECORDING DATA ON HOLOGRAPHIC STORAGE MEDIUM - Provided is an apparatus and method for recording data on a holographic storage medium. The apparatus includes: a light a light processing unit comprising the holographic storage medium and a light modulator, and recording data on the holographic storage medium using a reference beam and a signal beam modulated by the light modulator; and a control unit controlling the light processing unit to record the data on the holographic storage medium, wherein the light modulator is arranged so that an image formed on a surface of the light modulator is shorter in a radial direction that is a scanning direction of the reference beam than in a tangential direction that is perpendicular to the radial direction. | 05-13-2010 |
20100128591 | OPTICAL INFORMATION REPRODUCING APPARATUS, OPTICAL INFORMATION RECORDING AND REPRODUCING APPARATUS - In holographic recording by the angle multiplexing method, in order to allow a signal beam and a reference beam to sufficiently overlap with each other in a storage medium to decrease as much as possible a wastefully exposed region, which does not contribute to a signal recording, an optical pickup apparatus having a function which can control, for example, a size or a position of an aperture of the reference beam is used. An optical information reproducing apparatus or an optical information recording and reproducing apparatus using the optical pickup apparatus is used. | 05-27-2010 |
20100142352 | METHOD OF RECORDING HOLOGRAPHIC INFORMATION AND APPARATUS FOR RECORDING/REPRODUCING HOLOGRAPHIC INFORMATION - A method of recording holographic information and an apparatus for recording/reproducing holographic information. The method includes: forming an information layer by recording a hologram on a holographic recording layer of a holographic information storage medium; and fixing the information layer on which the hologram is recorded, by radiating light on the information layer. | 06-10-2010 |
20100142353 | Record Medium, Optical Disk Unit Using It, and Recording Method - To accomplish the object, the invention provides a record medium including a plate body | 06-10-2010 |
20100149945 | Record Medium, Optical Disk Unit Using It, and Recording Method - A plate body | 06-17-2010 |
20100149946 | METHOD FOR REPRODUCING HOLOGRAM - A method for reproducing a hologram includes: irradiating a recording disc with a first reference beam and a second reference beam, both having a parallel light flux, in different directions at a same incident angle to form a hologram having an unslanted grating pattern in which a grating vector is parallel to a light incident surface of the recording disc; irradiating the hologram with the first reference beam or the second reference beam to extract reproduced light; and detecting a position where an intensity of the reproduced light is maximum. | 06-17-2010 |
20100149947 | Laser Converging Apparatus, Optical Pickup Device, and Optical Disc Recording/Reproducing Apparatus - A laser converging apparatus comprising: a nonpolarizing hologram element having a first area defined by a numerical aperture corresponding to a thickness of a first protective layer of a first disk medium and a second area inside the first area, the second area defined by a numerical aperture corresponding to a thickness of a second protective layer (>the thickness of the first protective layer) of a second disk medium, the second area having a hologram pattern for diffracting laser light into zero order light and high-order diffracted light having the order of primary or higher; an objective lens having the numerical aperture corresponding to the thickness of the first protective layer, the objective lens converging the laser light having passed through a part of the first area other than the second area and the zero order light having passed through the second area onto an information surface on one side of the first protective layer, the objective lens converging the high-order diffracted light having passed through the second area onto an information surface on one side of the second protective layer; and a holder that holds the nonpolarizing hologram element and the objective lens. | 06-17-2010 |
20100157771 | METHOD AND SYSTEM FOR BIT PREDICTION USING A MULTI-PIXEL DETECTOR - The present techniques provide methods and systems for more reliable reading of optical data disks. In embodiments, a multi-pixel detector that is segmented into multiple areas, or detector segments, may be used to detect a pattern in the light reflected from an optical data disk. The pattern may include light scattered from a single bit that may be under a center detector, as well as light scattered from proximate bits. The detector system may then combine the quantized values from each of the detector segments mathematically to determine the presence or absence of a bit or bits of data. The mathematical combination may also use data that is known about the status of adjacent data bits (such as previously read bits, or bit patterns which are allowed or not allowed by specific data encoding schemes) to improve the accuracy of the bit prediction. | 06-24-2010 |
20100157772 | DATA STORAGE DEVICES AND METHODS - A data storage device comprises a substrate having oppositely disposed surfaces and a plurality of volumes arranged along tracks between the surfaces; a plurality of micro-holograms each contained in a corresponding one of the volumes; and, at least one groove in at least one of the surfaces and being operative to diffract light through the at least one surface and into the volumes; wherein, the presence or absence of a micro-hologram in a stacked layer in each of the volumes is indicative of a corresponding portion of data stored. | 06-24-2010 |
20100157773 | DATA STORAGE DEVICES AND METHODS - A data storage device including: a plastic substrate having a plurality of volumes arranged in tracks along a plurality of vertically stacked, laterally extending layers therein; and, a plurality of micro-holograms each contained in a corresponding one of the volumes; herein, the presence or absence of a micro-hologram in each of the volumes is indicative of a corresponding portion of data stored. | 06-24-2010 |
20100157774 | DATA STORAGE SYSTEMS AND METHODS - A system for use with a data storage media having at least one groove proximate a surface thereof and a plurality of volumes therein, including: objective lensing; a first tracking error detector optically coupled to the objective lensing and being responsive to reflections from the at least one groove; a first actuator coupled and responsive to the first tracking error detector; a second tracking error detector optically coupled to the objective lensing and responsive to reflections from micro-holograms contained in at least some of the volumes; and, a second actuator coupled and responsive to the second tracking error detector; wherein the first and second actuators cooperate to selectively position the objective lensing to focus a light beam into a target one of the volumes. | 06-24-2010 |
20100157775 | DATA STORAGE DEVICES AND METHODS - A data storage device including: a plastic substrate having a plurality of data volumes arranged along tracks in a plurality of stacked layers; a plurality of micro-holograms each contained in a corresponding one of the data volumes; a plurality of complementary volumes, each corresponding to and being substantially aligned with one of the data volumes; a plurality of micro-holograms each contained in a corresponding one of the complementary volumes; wherein, the presence or absence of a micro-hologram in each of the data volumes is indicative of a corresponding portion of data stored; and, the ones of the complementary volumes corresponding to the ones of the data volumes containing a micro-hologram do not contain a micro-hologram; and the ones of the complementary volumes corresponding to the ones of the data volumes not containing a micro-hologram contain a micro-hologram. | 06-24-2010 |
20100157776 | VERTICALLY TRACKED DATA STORAGE DEVICE AND METHOD - A data storage device including: a plastic substrate having a plurality of volumes arranged along a plurality of depth-extending, concentrically stacked tracks; and, a plurality of micro-holograms each contained in a corresponding one of the tracks; wherein, the presence or absence of a micro-hologram in each of said volumes is indicative of a corresponding portion of data stored. | 06-24-2010 |
20100165816 | SYSTEM AND METHOD FOR TRACKING IN SINGLE-BIT HOLOGRAPHIC DATA STORAGE - A system and method for controlling tracking in a holographic data storage system, including: impinging a beam on a holographic data disc, wherein the beam is reflected from a micro-hologram disposed within the holographic data disc; detecting the reflected beam from the holographic data disc by a multi-element detector; and analyzing a pattern detected by multi-element detector to generate a tracking error signal. | 07-01-2010 |
20100165817 | DISC STRUCTURE FOR BIT-WISE HOLOGRAPHIC STORAGE - An optical disc for micro-holographic data storage, including: optically-enabled material configured to store holographic data; guide grooves; a first coating disposed on the guide grooves and configured to reflect a tracking beam and to transmit a read or record beam; and a second coating disposed to cover the guide grooves and disposed on the first coating. | 07-01-2010 |
20100165818 | SYSTEM AND METHOD FOR DUAL-BEAM RECORDING AND READOUT OF MULTILAYERED OPTICAL DATA STORAGE MEDIA - A system and method of operating a dual-beam detection system of a holographic data storage disc, including: impinging a data beam on a data layer of the holographic data storage disc; impinging a tracking beam on a tracking element of the holographic data storage disc; detecting a reflection of the tracking beam from the tracking element; and coordinating position of the data beam relative to the tracking beam. | 07-01-2010 |
20100165819 | MASTERING AND REPLICATION OF MICRO-HOLOGRAPHIC DATA STORAGE MEDIA - A system and method for replicating optical data storage discs (e.g., holographic data storage discs) having multiple layers of data. Master discs providing for respective single layers of data are utilized, and each respective single layer of data from the master discs are replicate onto the optical data storage disc. | 07-01-2010 |
20100182889 | Optical disk apparatus, optical pickup, preformatted signal generation method and program - There is provided an optical disk apparatus causing a hologram device to diffract a reflected light beam and causes each of reflected light beams of primary light in a longitudinal direction to generate received light signals by receiving the reflected light beams through receiving regions of a receiving unit before a preformatted signal being generated by a signal processing unit based on the received light signals. Therefore, the preformatted signal that excludes an influence of a stray light pattern by an interlayer stray light beam from a plurality of recording layers can be generated. | 07-22-2010 |
20100202269 | DATA RECORDING METHOD IN HOLOGRAPHY OPTICAL MEMORY SYSTEM - According to an aspect of the present invention, a data recording method in a holography optical memory system, for recording a two-dimensional pixel data page in a recording medium can be provided. In accordance with an embodiment of the present invention, the data recording method in a holography optical memory system can include recording sequentially the signal beams carrying one-dimensional pixel data lines, included in the original two dimensional pixel data page, in the recording medium by using the same reference beam. Here, the pixel data page can be recorded such that any two adjacent pixel data lines are partially overlapped with each other in an area of the recording medium. | 08-12-2010 |
20100202270 | OPTICAL INFORMATION RECORDING METHOD AND APPARATUS - In a recording apparatus capable of performing a curing process at high speed by curing a plurality of books at a time during recording and capable of performing recording of a recordable type, when recording is stopped once, the unit of books to be cured at a time is set smaller than that during continuous recording, in order to realize inexpensively both performing a curing process at high speed in hologram recording and realizing recording of a recordable type freely in a book unit. It is therefore possible to terminate recording in the unit of arbitrary books irrespective of the unit of books to be cured, and perform recording of a recordable type without loss. | 08-12-2010 |
20100202271 | OBJECTIVE LENS FOR RECORDING HOLOGRAM AND HOLOGRAM RECORDING DEVICE - Provided is an objective lens for recording a hologram that condenses an recording beam on a hologram recording medium, and the objective lens is configured so as to condense, in the case where the recording beam is incident upon the objective lens in a form of a parallel beam flux, an on-axis beam flux and an off-axis beam flux contained in the parallel flux so as to form a beam waist in the hologram recording medium, and such that a distance between an off-axis image point of the off-axis beam flux that defines a largest field angle among the off-axis beam fluxes gradually converging ahead of the beam waist and the hologram recording medium becomes minimal. | 08-12-2010 |
20100226232 | APPARATUS AND METHOD FOR RECORDING/REPRODUCING OPTICAL INFORMATION, AND DATA FETCHING BY REFERENCE TO OPTICAL INFORMATION RECORDING MEDIUM - Provided are an optical information recording/reproducing apparatus and method capable of managing a wavelength of a light source when information is recorded/reproduced by utilizing holography, and limiting a wavelength of an interference fringe in a medium, and an optical information recording medium. For information recording/reproducing relative to an optical information recording medium by a pickup, a wavelength detector circuit detects a reference wavelength recorded in a storage area of the optical information recording medium, in accordance with the detected reference wavelength, a controller adjusts a wavelength of a light source of the pickup to have an optimum wavelength, and if a temperature detected with a temperature sensor indicates a predetermined change, readjusts the wavelength of the light source of the pickup to have an optimum wavelength. | 09-09-2010 |
20100232280 | APPARATUS AND METHOD TO STORE INFORMATION IN A HOLOGRAPHIC DATA STORAGE MEDIUM - A method to provide data storage services using one or more holographic data storage media disposed in a holographic data storage system operated by a data storage services provider, wherein the holographic data storage system comprises a light source, a spatial light modulator, and a plurality of holographic data storage media, wherein the method receives information provided by the data storage services customer, allocates a first holographic data storage medium for exclusive storage of information provided by the data storage services customer, defines an outer storage portion of the first allocated holographic data storage medium, and stores the information as one or more holograms encoded in the outer storage portion of the first holographic data storage medium. | 09-16-2010 |
20100246367 | OPTICAL INFORMATION RECORDING METHOD AND APPARATUS USING THE SAME - An optical information recording method includes the following steps. A converting step is converting a light beam into an information beam carrying information by using a spatial beam modulator. A focusing step is focusing the information beam on an optical information recording medium including an information recording layer. An irradiating step is irradiating the optical information recording medium with a reference beam and the information beam so that the reference beam and the information beam intersect with each other on the information recording layer by using an optical component. A rotating step is rotating the optical information recording medium or the optical component by using a drive unit for performing angle-multiplex recording. A management information recording step is recording management information at two or more relative angles having an angle interval smaller than twice at least a first null angle. | 09-30-2010 |
20100265808 | HOLOGRAM DEVICE, TILT DETECTION METHOD, AND TILT CORRECTION METHOD - A hologram device includes: a light source for applying light to a hologram recording medium having a recording layer in which information recording is performed by interference fringes between signal light and reference light; a spatial modulation unit that generates the signal light and/or the reference light and generates a marker light in a predetermined position within an incident surface of the light from the light source by performing spatial light modulation on the light from the light source; a light applying unit that applies the light subjected to spatial light modulation by the spatial light modulation unit to the hologram recording medium via an objective lens; a light receiving unit that receives the light applied via the objective lens through the hologram recording medium; and a tilt detection unit that obtains a tilt error signal representing an error from an ideal angle of a tilt angle as an incident angle of the applied light via the objective lens to an information recording surface of the hologram recording medium based on a result of detection of an error between an ideal light reception position of the marker light in the light receiving unit and a real light reception position of the marker light by the light receiving unit. | 10-21-2010 |
20100271921 | OPTICAL INFORMATION RECORDING MEDIUM, OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE AND OPTICAL INFORMATION RECORDING/REPRODUCING METHOD - A holographic recording medium in which information can be reproduced by phase conjugate beam without requiring a mirror for obtaining the phase conjugate beam and its driving part and recording density is not reduced. The recording medium includes a recording layer in which an interference pattern is recorded and a light absorption/transmission layer which can be reversibly changed to be in a first state where signal beam and reference beam passed through the recording layer are absorbed at the time of recording of information and a second state where the reference beam is transmitted at the time of reproduction of information, and the reference beam transmitted through the light absorption/transmission layer is reflected by a reflection layer to produce the phase conjugate beam. | 10-28-2010 |
20100271922 | HOLOGRAM RECORDING DEVICE - A hologram recording device that records a hologram by passing recording light and reference light through the same objective lens and irradiating a recording medium, includes: a light splitter for dividing light from a light source into the recording light and the reference light; a light combining member for combining the recording light and the reference light, which have been divided by the light splitter, so as to be coaxial, and causing these light beams to advance to the objective lens; first and second lenses, positioned on an optical paths of the recording light and reference light, between the light splitter and the light combining member; a first aperture that narrows the recording light which has passed through the first lens; and, a second aperture that narrows the reference light which has passed through the second lens, the first and second lenses being configured to have different optical magnifications. | 10-28-2010 |
20100271923 | Optical pickup - An optical-pickup hologram element has six regions on an x-y plane, divided as follows: the first region with a first line (an x-axis) and a second line that connects points (−xa, 0) and (−xb, yb); the second region with the first and second lines and a third line connecting points (xa, 0) and (xb, yb); the third region with the first and third lines; the fourth region with the first line and a fourth line connecting the point (xa, 0) and a point (xb, −yb); the fifth region with the first and fourth lines and a fifth line connecting the point (−xa, 0) and a point (−xb, −yb); and the sixth region with the first and fifth lines (xa10-28-2010 | |
20100296380 | Spatial Light Modulators with Changeable Phase Masks for Use in Holographic Data Storage - A holographic data storage system that includes a write head that includes a pixellated spatial light modulator and a separate or integral phase mask that varies the phase depending on the location in the phase mask that light passes through. The phase variation can be changed over time in a random, pseudo-random, or predetermined fashion. The spatial light modulator and phase mask can be implemented in a liquid crystal SLM (nematic, ferroeleletric, or other), in a DMD SLM, in a magneto-optical SLM, or in any other suitable manner. | 11-25-2010 |
20100296381 | Apparatus and Method to Store Information in a Holographic Data Storage Medium - A method is disclosed to store information in a holographic data storage medium. The method provides a hologram comprising an alignment pattern, and disposes that hologram into a holographic data storage medium during manufacture. | 11-25-2010 |
20100302927 | OPTICAL DATA STORAGE MEDIUM AND METHODS FOR USING THE SAME - There are provided an optical data storage medium and methods of optical data storage using the same. The optical data storage medium comprises a non-linear sensitizer capable of absorbing actinic radiation to cause upper triplet energy transfer to a reactant that undergoes a photochemical change upon triplet excitation. | 12-02-2010 |
20100309768 | HOLOGRAM DISC READING AND WRITING APPARATUS AND HOLOGRAM DISC READING APPARATUS - A hologram disc reading and writing apparatus including a signal light source module, a beam splitter, a reference/reading light source, a reflector, and an optical reading head and a hologram disc reading apparatus are provided. A signal light beam emitted from the signal light source module is transmitted to a data region of a hologram disc through the beam splitter. The reference/reading light source, the signal light source module, and the optical reading head are disposed at the same side of the hologram disc. The reflector is disposed at the other side. A spherical wave light beam emitted from the reference/reading light source is transmitted through the data region and reflected by the reflector to form a phase conjugate light beam transmitted to and through the data region. The phase conjugate light beam is transformed to a data light beam transmitted to the optical reading head through the beam splitter. | 12-09-2010 |
20100315931 | Pre-Exposure and Curing of Photo-Sensitive Material for Optical Data Storage - The present invention relates to a method for performing pre-exposure and curing of a photo-sensitive material for optical data storage, in particular for holographic data storage, and to an apparatus for writing to optical storage media using such method. According to the invention, for pre-exposure and/or curing of an optical storage medium the optical storage medium is illuminated by a coherent light beam emitted by a light source, which is also used for data recording. Pre-exposure and/or curing is performed in one or more exposure steps, in which the coherent light beam carries a data pattern, the exposure dose for each exposure step being smaller than a minimum dose such that the diffraction efficiency of the recorded data pattern is too low to distinguish data from noise. | 12-16-2010 |
20100322058 | HOLOGRAPHIC STORAGE SYSTEM USING ANGLE-MULTIPLEXING - A holographic memory storage device that uses a photorefractive crystal for storing data is disclosed. The device uses angle-multiplexing in order to store and retrieve page data and sub page data. MEMS devices are used in order to provide individual sector addressing. | 12-23-2010 |
20110007620 | DATA PAGE FOR USE IN A HOLOGRAPHIC DATA STORAGE SYSTEM - A data page for use in a holographic data storage system, and to a method and an apparatus for writing to holographic storage media using such a data page are described. The data page has dark zones for each boundary between phase blocks of a phase mask of the holographic data storage system, which consist of switched-off pixels that are not used for encoding data, and which coincide with the boundaries between the phase blocks. | 01-13-2011 |
20110044151 | ELECTRONIC DEVICE - An electronic device that performs at least reading or regeneration of data in or from a hologram disc is characterized by including an objective lens | 02-24-2011 |
20110051586 | OPTICAL DATA STORAGE MEDIA AND METHODS FOR USING THE SAME - There are provided optical data storage media and methods of optical data storage using the same. The optical data storage media comprises a non-linear sensitizer capable of absorbing actinic radiation to cause upper triplet energy transfer to a reactant that undergoes change upon triplet excitation. The refractive index change (Δn) of the medium is at least about 0.005, or even at least about 0.05. | 03-03-2011 |
20110069596 | HOLOGRAPHIC RECORDING METHOD, A HOLOGRAPHIC RECORDING MEDIUM AND USE OF SUCH MEDIUM - A method of recording content comprising the steps of: providing a content storage medium comprising a pre-recorded grating or hologram; and illuminating a pre-recorded grating or hologram with a single recording beam to record content in the grating or hologram. The recording beam may increase the diffraction efficiency of the pre-recorded grating or hologram. Alternatively, the recording beam may form a new grating or hologram in close proximity to a pre-recorded grating or hologram. | 03-24-2011 |
20110069597 | OPTICAL HEAD APPARATUS, HOLOGRAPHIC OPTICAL DEVICE, OPTICAL INTEGRATED DEVICE, OPTICAL INFORMATION PROCESSING APPARATUS, AND SIGNAL DETECTION METHOD - An optical head apparatus including a holographic optical device which diffracts a light beam and includes a first diffraction region and a second diffraction region facing each other across a region dividing line passing through an optical axis of a light-collection optical system and extending in a radial direction of an optical disc, the first diffraction region having a grating pattern for generating diffracted light having a first wavefront and entering a first photoreception region and a second photoreception region, the second diffraction region having a grating pattern for generating diffracted light having a second wavefront and entering a third photoreception region and a fourth photoreception region, the first and second wavefronts having first and second coma aberrations in the radial direction of the optical disc, respectively, and the first and second coma aberrations having axes located off the optical axis. | 03-24-2011 |
20110096653 | MICRO-HOLOGRAPHIC DATA STORAGE SYSTEM AND METHOD - A micro-holographic data storage system and method. Micro-holograms are written to a data storage medium with two counter-propagating beams via objective recording lenses which have a first numerical aperture (NA) to make the micro-holograms larger. Alternatively, elongated micro-holograms can be produced using counter-propagating beams with different focus points. The micro-holograms are retrieved from the data storage medium using a single beam via an objective reading lens which has a second NA that is higher than the first NA. The data storage medium has a substrate with a plurality of tracks separated by a track pitch. The plurality of micro-holograms are each contained in each of the plurality of tracks, wherein, at least one of the plurality of micro-holograms has a width which is nearly equal to a width of the track pitch. | 04-28-2011 |
20110134741 | RECORDING/REPRODUCING METHOD IN READ-ONLY HOLOGRAPHIC RECORDING MEDIUM, AND READ-ONLY HOLOGRAPHIC RECORDING MEDIUM - A recording signal beam and a recording reference beam are irradiated onto a first surface of a holographic recording medium to write an information as an interference pattern therein. Next, a reflective layer is provided on a second surface opposite to the first surface of the holographic recording medium such that the reflective layer is adhered with the second surface, and a reproducing reference beam is irradiated onto the first surface of the holographic recording medium so as to read a signal beam which is reflected at the reflective layer and reproduced from the holographic recording medium. | 06-09-2011 |
20110170395 | OPTICAL INFORMATION RECORDING APPARATUS - According to one embodiment, an optical information recording apparatus includes a spatial light modulator, an optical mechanism, a driving module, and a controller. The spatial light modulator converts an irradiation beam emitted from a light source to plural partial information beams that carry information by causing the irradiation beam to pass through plural modulation areas. The optical mechanism collects the partial information beams onto an optical information recording medium and applies a reference beam onto the recording medium such that the reference beam and the partial information beams intersect with each other on an information recording layer. The driving module drives the recording medium or the optical mechanism. The controller performs angle multiplex recording of information on the information recording layer by controlling the driving module and causing the light source to emit the irradiation beam while switchingly supplying the modulation areas with the information. | 07-14-2011 |
20110211436 | Information Processor Device and Storage Medium - In an information storage device in which small partitions for storing information are three-dimensionally placed inside a solid, the invention aims at long-period storage, robustness, and rapid information reading. Accordingly, the stored three-dimensional information is divided into two-dimensional data for each layer, and two-dimensional inverse Fourier transform is previously applied for the two-dimensional data. The two-dimensional data is recorded in each layer in a Z direction inside a storage medium which is solid. When the information is reproduced, electromagnetic waves are irradiated to a storage area MA as gradually rotating the storage area MA around a z axis, and projection images of all layers during the rotation are obtained from response. By applying one-dimensional Fourier transform for a plurality of projection images obtained as described above, the recorded original three-dimensional information is rapidly reproduced. | 09-01-2011 |
20110222389 | LASER CONVERGING APPARATUS, OPTICAL PICKUP DEVICE, AND OPTICAL DISC RECORDING/REPRODUCING APPARATUS - A laser converging apparatus includes a polarizing hologram element having a first area defined by a numerical aperture corresponding to a thickness of a first protective layer of a first disk medium and a second area inside the first area, the second area defined by a numerical aperture corresponding to a thickness of a second protective layer (>the thickness of the first protective layer) of a second disk medium. A wavelength selecting nonpolarizing hologram element has a third area defined by a numerical aperture corresponding to a thickness of a third protective layer (>the thickness of the first protective layer) of a third disk medium. The laser converging apparatus also includes an objective lens having the numerical aperture corresponding to the thickness of the first protective layer, and a holder that holds the polarizing hologram element, the nonpolarizing hologram element, and the objective lens. | 09-15-2011 |
20110228663 | HOLOGRAPHIC RECORDING METHOD - A holographic recording method includes the following steps:
| 09-22-2011 |
20110235493 | Collinear Holographic Storage Method and Apparatus - In the specification and drawings, a collinear holographic storage method is described and shown with a controlling step to control the temperature of the collinear holographic storage media such that the writing temperature of the collinear holographic storage media is from between about 5° C. to about 50° C. higher than the reading temperature of the collinear holographic storage media. | 09-29-2011 |
20110242958 | SYSTEM AND METHOD FOR TRANSFER OF DATA STORED IN HOLOGRAPHIC STORAGE MEDIUM - A system for processing information is provided. The system includes multiple micro-holograms contained in multiple volumes arranged along multiple tracks in one or more storage mediums. Each of the micro-hologram includes a data. The system also includes one or more pick-up head devices with optical lenses for directing laser beams on the multiple tracks. Further, the system includes a subsystem for arranging the one or more pick-up head devices for recording and retrieving of the data from the one or more storage mediums. | 10-06-2011 |
20110249544 | Reading Device - A reading device includes a spatial light modulator, a zoom lens set, an object lens, an image sensor, and an adjusting module. The spatial light modulator provides a reading beam. The zoom lens set forms the reading beam into a real image. The object lens focuses the real image onto a collinear holographic storage medium and thus produces a diffraction signal. The image sensor converts the diffraction signal into an electric signal. The adjusting module adjusts the optical magnification of the zoom lens set according to the quality of the diffraction signal. | 10-13-2011 |
20110255391 | HOLOGRAM RECORDING AND REPRODUCING DEVICE AND METHOD FOR RECORDING HOLOGRAM - A hologram recording and reproducing device controls an optical beam output from an external cavity semiconductor laser to improve a diffraction efficiency. The hologram recording and reproducing device includes an external cavity laser, a photodiode, a laser drive circuit and a laser diode controller. The external cavity laser has a laser diode adapted to emit an optical beam that is used to generate data light and reference light with which a hologram recording medium is irradiated. The photodiode detects the amount of the optical beam output from the external cavity laser. The laser drive circuit supplies a current to the external cavity laser. The laser diode controller controls the laser drive circuit to ensure that a value obtained by integrating the detected intensity of the optical beam with respect to time over a predetermined period is equal to predetermined recording energy. | 10-20-2011 |
20110261670 | OPTICAL PICKUP DEVICE AND OPTICAL DISC DEVICE - When recording/reproducing an information recording medium having a plurality of information recording layers, a photodetector receives reflected light from a recording layer which is being recorded/reproduced, as well as reflected light from another recording layer which is not being recorded/reproduced, making it difficult to appropriately detect control signals during a recording/reproducing operation. The present invention employs a polarization hologram element so that the polarization direction of 0 | 10-27-2011 |
20110317537 | MULTILAYER COAXIAL HOLOGRAPHIC STORAGE SYSTEM - An apparatus for reading from a multilayer holographic storage medium with a coaxial arrangement of a reference beam and a reconstructed object beam is described. The apparatus has an objective lens for focusing the reference beam into the multilayer holographic storage medium such that the reference beam has a focal point behind or in front of a reflective layer of the multilayer holographic storage medium, wherein a distance between the objective lens and the multilayer holographic storage medium is set in accordance with an addressed layer of the multilayer holographic storage medium, and an imaging system with a fixed lens of focal length f and a movable lens of focal length f for re-collimating a reconstructed object beam, wherein for a specific position of the movable lens the imaging system assumes a 4f configuration. For re-collimating the reconstructed object beam the apparatus is adapted to shift the movable lens of the 4f imaging system by substantially twice the shift of the objective lens necessary for addressing a specific layer of the multilayer holographic storage medium. | 12-29-2011 |
20120008482 | SYSTEM FOR HOLOGRAPHY - The present invention provides systems of recording holograms that reduce the writing time, increase the diffraction efficiency, improve the resolution, or restitute color. These systems are well suited for use with an updateable 3D holographic display using integral holography and photorefractive polymer. | 01-12-2012 |
20120026855 | METHOD AND SYSTEM FOR PROCESSING INFORMATION FROM OPTICAL DISK LAYERS - A method for processing information is provided. The method includes directing a laser beam to a first track of a first layer of a holographic storage medium. The method also includes recording a base voltage based on a look-up table. The method includes directing the laser beam to a target track in the first layer, based on position information in tracks. Further, the method includes recording an offset voltage for the target track into the look-up table. Still further, the method includes directing the laser beam to a target layer based on position information in vertical wobbles. The method also includes recording an offset voltage for the target layer into the look-up table. Finally, the method includes determining a final voltage based on the look-up table and applying the final voltage to an actuator for moving the laser beam to a final target position in the holographic storage medium for recording and retrieval of information. | 02-02-2012 |
20120026856 | OPTICAL INFORMATION RECORD/REPRODUCTION APPARATUS AND REPRODUCTION APPARATUS - A holographic memory apparatus comprises first phase modulation means that adds phase information to each pixel of a signal beam to generate page data at recording time; oscillator light generation means that generates an oscillator light that is superimposed on, and interferes with, a diffracted light from a holographic recording medium at reproduction time; second phase modulation means that adds phase information to the oscillator light; and light detection means that detects an interference light generated by superimposing the oscillator light and the diffracted light from the holographic recording medium. | 02-02-2012 |
20120092979 | METHOD OF PARALLEL BIT-WISE HOLOGRAPHIC DATA STORAGE USING A PARALLEL LIGHT SOURCE - The present techniques provide techniques for outputting counter-propagating parallel light waves to pre-record a holographic data disk. The parallel light waves are transmitted through a holographic system via a fiber optic bundle including a plurality of polarization-maintaining (PM) optical fibers. Each of the PM optical fibers in the fiber optic bundle may have one or more of a different wavelength, a different coherence length, and a different polarization orientation to reduce crosstalk in the disk. Furthermore, the fiber optic bundle array is rotated to produce interference spots indicative of micro-holograms according to the data track pitch of the holographic disk over which the fiber optic bundle is outputting the light waves. | 04-19-2012 |
20120092980 | REPLICATION AND FORMATTING METHOD AND SYSTEM FOR BIT-WISE HOLOGRAPHIC STORAGE - The present techniques provide methods and systems for recording micro-holograms on a holographic disk using a plurality of counter-propagating light beams in parallel. The parallel counter-propagating light beams overlap to form interference patterns on a data layer and over multiple data tracks in the holographic disk. Rotating the disk enables the parallel recording of micro-holograms over multiple data tracks, thus reducing recording time. Further, the illumination pattern may include illuminated spots and non-illuminated regions, such that each illumination spot may cover a relatively small fraction of the data layer plane, possibly controlling the depth spread of the recorded micro-hologram. In some embodiments, data in the parallel signal beams may be retrieved from a master holographic disk or may be modulated into the parallel signal beams. | 04-19-2012 |
20120147724 | OPTICAL DATA STORAGE MEDIA AND METHODS FOR USING THE SAME - An optical data storage medium is provided. The optical data storage medium includes a polymer matrix; a reactant capable of undergoing a change upon triplet excitation, thereby causing a refractive index change; and a non-linear sensitizer capable of absorbing actinic radiation to cause upper triplet energy transfer to said reactant. The refractive index change capacity of the medium is at least about 0.005. The non-linear sensitizer comprises a triarylmethane dye. | 06-14-2012 |
20120163152 | OPTICAL INFORMATION REPROCESSING APPARATUS AND OPTICAL INFORMATION REPRODUCING METHOD - In reproduction of a two-dimensional page data from an optical information recording medium utilizing holography, a reproduced two-dimensional page data is divided into a plurality of areas each of which has a predetermined size, the divided two-dimensional areas are individually subjected to adaptive equalizing, and then are coupled to restore the condition of the original two-dimensional page data. | 06-28-2012 |
20120170437 | NON-BINARY HOLOGRAMS FOR INCREASED CAPACITY - Techniques are provided for increasing storage capacity in a holographic storage system. While typical holographic storage systems involve binary storage for each data position in a holographic disk, present techniques involve storing data such that more than two data levels may be recorded in each data position. In some embodiments, a recording beam directed to the disk may be adjusted to different power levels depending on the data level to be recorded. Furthermore, the recording time at a data position may be adjusted to increase the energy directed to the data position by increasing the amount of time the recording beam is impinged on the data position. Embodiments are suitable for different types of holographic storage, including dye-based medium. | 07-05-2012 |
20120170438 | SERVO STRUCTURE IN SINGLE-BIT HOLOGRAPHIC VOLUME RECORDING AND READOUT - Methods and systems are provided for recording micro-holograms in a holographic disk. Disk tilting or disk imperfections may cause counter-propagating recording and reference beams to deviate from the target data position in the disk. In some embodiments, a tracking beam is directed to a tracking position in the disk, and deviation of the tracking beam from the tracking position may indicate tracking and/or focusing errors of the recording and/or reference beams. A detector may generate an error signal in response to such errors. A first servo-mechanical system may actuate a first optical head (e.g., transmitting the reference and tracking beams) to compensate for such errors, and a second servo-mechanical system may actuate a second optical head (e.g., transmitting the recording beam) to follow the actuation of the first servo system, such that an interference of the reference beam and the recording beam may be maintained in the target data position. | 07-05-2012 |
20120176880 | OPTICAL INFORMATION RECORDING APPARATUS, OPTICAL INFORMATION RECORDING METHOD, OPTICAL INFORMATION REPRODUCING APPARATUS AND OPTICAL INFORMATION REPRODUCING METHOD - An optical information recording/reproducing apparatus and an optical information recording/reproducing method that record information using holography, wherein the optical information recording/reproducing apparatus includes a signal generation unit that generates two-dimensional data by a two-dimensional encoding method in which a lower-limit value of a number of continuous ON/OFF pixels in an array in one direction of pixels in a two-dimensional spatial light modulator is K(K≧2, K: natural number); and a pickup that records the two-dimensional data, generated by the signal generation unit, on a hologram disc. | 07-12-2012 |
20120213051 | OPTICAL PICKUP HEAD - An optical pickup head is provided, which includes a silicon substrate, in which an aperture and an objective lens are disposed on the silicon substrate; and a laser diode (LD), a 135-degree tilted reflector, and a 135-degree tilted holographic reflector are disposed on the silicon substrate. The two 135-degree tilted reflectors and a holographic optical element (HOE) are fabricated on a slant face structure of an optical platform using a semiconductor process, so all the elements are disposed at a straight zone, and then in combination with bonding of the LD and an optical sensor element, an miniaturization objective is achieved and an optical path is shortened. | 08-23-2012 |
20120281516 | OPTICAL PICKUP AND OPTICAL INFORMATION STORAGE MEDIUM SYSTEM USING THE SAME - An optical pick-up is provided. The optical pick-up includes a light source, a first objective lens configured to focus light emitted from the light source on a high-density optical information storage medium, a photo-detector configured to detect a signal by receiving light reflected from the high-density optical information storage medium, an optical-path changer configured to convert a travel path of incident light to allow the light emitted from the light source to proceed toward the high-density optical information storage medium, and to allow the light reflected from the high-density optical information storage medium to proceed toward the photo-detector, and a blocking device disposed in an optical path of signal light reflected from a target reproducing/recording layer of the high-density optical information storage medium, passes through the first objective lens, and proceeds toward the photo-detector. | 11-08-2012 |
20120300608 | APPARATUS AND METHOD FOR IRRADIATING A MEDIUM - A method for irradiating a medium with a wave which is designed to focus on a particular portion in the medium, the method includes: irradiating the medium with an electromagnetic wave which is scattered in the medium, and is not designed to focus on the particular portion in the medium; detecting a first signal caused by irradiating the medium with the electromagnetic waver; irradiating the medium with a reconstructed wave which is designed to focus on the particular portion in the medium; detecting a second signal caused by irradiating the medium with the reconstructed wave; and monitoring, based on the first and second signals, that the particular portion is irradiated by the reconstructed wave. | 11-29-2012 |
20130033976 | STRUCTURE AND METHOD FOR GENERATING AN OPTICAL IMAGE FROM AN ULTRASONIC HOLOGRAPHIC PATTERN - An acoustic hologram imaging system constructed from a machined housing having folded optics. Various surfaces of the housing are machined to provide a precise alignment to the optical members to be connected thereto, such as a mirror, a lens assembly, a light emitting laser diode, a camera, and the like. A three-part lens is described having different materials with different indexes of refraction in order to provide a desired focus of the light. In addition, an optical spatial filter is disclosed in which, according to various embodiments, all, some, or none of the light passing therethrough is attenuated for recording of the optical image of the hologram. | 02-07-2013 |
20130039160 | APPARATUS AND METHOD FOR RECORDING MICRO-HOLOGRAM - An apparatus and method for recording a micro-hologram are provided. The micro-hologram recording apparatus includes a first light source configured to emit a first light, the first light being coherent, a first optical system configured to divide the first light into a signal beam and a reference beam, and supply the signal beam and the reference beam to a location on a hologram recording medium, a second light source configured to emit a second light, the second light being incoherent and not interfering with the signal beam and the reference beam, and a second optical system configured to supply the second light to the same location as the signal beam and the reference beam on the hologram recording medium. | 02-14-2013 |
20130077457 | HOLOGRAPHIC RECORDING METHOD, AND RECORDING AND REPRODUCTION APPARATUS - In one embodiment, a method is disclosed for recoding information in form of a hologram. The method can generate a displacement signal by detecting a displacement of a holographic recording medium. The method can perform an exposure control operation that, if the sampling value of the displacement signal falls within an allowable displacement range, records the information item in the holographic recording medium, and if the sampling value of the displacement signal falls outside the allowable displacement range, blocks or reduces at least one of the information light and the reference light to a light intensity with which the information item is not recorded in the holographic recording medium. | 03-28-2013 |
20130094340 | DATA PROTECTION SYSTEM - The present invention provides systems and methods for logically organizing data for storage and recovery on a data storage medium using a multi-level format. The present invention also provides systems and methods for protecting data stored on data storage medium so that the data may be recovered without errors. | 04-18-2013 |
20130121125 | APPARATUS AND METHOD FOR PROCESSING OPTICAL INFORMATION USING LOWDENSITY PARITY CHECK CODE - An apparatus and method for processing optical information using a low density parity check code are suggested. An optical information recording method includes the steps of encoding data to record into a low density parity check code; representing the data, which is encoded into the low density parity check code, to a spatial light modulator in the unit of a data page; and modulating a recording beam into the data page representing the spatial light modulator to be recorded in the form of hologram in a recording medium. By blocking inexact probability information from being concentrated in the LDPC code block, by achieving exact probability information through effective allocation of a mark, and by improving average accuracy of the pixel, which corresponds to the LDPC code, failure rate of decoding can be minimized so that decoding performance can be improved. | 05-16-2013 |
20130128712 | REACTANTS FOR OPTICAL DATA STORAGE MEDIA AND METHODS FOR USE - The present disclosure relates generally to optical data storage media, and more specifically, to holographic storage media. In one embodiment, an optical storage medium includes a polymer matrix having one or more polymer chains. The optical storage medium also includes a reverse saturable absorption (RSA) sensitizer disposed within the polymer matrix that is configured to become excited upon exposure to light having an intensity above an intensity threshold and configured to transfer energy to a reactant. The optical storage medium also includes a diphenyl cyclopropene (DPCP)-derivative reactant disposed within the polymer matrix and capable of undergoing a modification upon receiving an energy transfer from the excited sensitizer that changes a refractive index of the optical medium. | 05-23-2013 |
20130128713 | REVERSE SATURABLE ABSORBTION SENSITIZERS FOR OPTICAL DATA STORAGE MEDIA AND METHODS FOR USE - The invention relates generally to optical data storage media, and more specifically, to holographic storage media. In one embodiment, an optical storage medium composition includes a polymer matrix. Disposed within the polymer matrix is a reactant capable of undergoing a modification that alters the refractive index of the composition upon receiving an energy transfer from an excited sensitizer. A non-linear sensitizer is also disposed within the polymer matrix, and the sensitizer includes a metal-substituted subphthalocyanine (M-sub-PC) reverse saturable absorber configured to become excited upon exposure to light beyond an intensity threshold at approximately 405 nm and configured to transfer energy to the reactant. | 05-23-2013 |
20130128714 | OPTICAL INFORMATION RECORDING APPARATUS, OPTICAL INFORMATION REPRODUCING APPARATUS, OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS, OPTICAL INFORMATION RECORDING METHOD, OPTICAL INFORMATION REPRODUCING METHOD AND OPTICAL INFORMATION RECORDING/REPRODUCING METHOD - The above-described problem can be solved by the following optical-information reproducing apparatus: An optical-information reproducing apparatus for reproducing a hologram storage medium into which an interference pattern is recorded as a hologram, the interference pattern being formed by causing a reference beam and a signal beam to interfere with each other, the optical-information reproducing apparatus, including an optical detector for detecting a reproduced beam, the reproduced beam being acquired by illuminating the recorded hologram with the reference beam, an optical element for generating a first reference beam and a second reference beam by branching the reference beam, a wavefront detector for detecting wavefront aberration of the reference beam by causing the first reference beam and the second reference beam to interfere with each other, and a wavefront compensator for compensating the wavefront of the reference beam, wherein the wavefront compensator is adjusted based on an output of the wavefront detector. | 05-23-2013 |
20130142025 | OPTICAL INFORMATION RECORDING APPARATUS, OPTICAL INFORMATION RECORDING METHOD, OPTICAL INFORMATION REPRODUCING APPARATUS AND OPTICAL INFORMATION REPRODUCING METHOD - An optical information recording/reproducing apparatus and an optical information recording/reproducing method that record information using holography, wherein the optical information recording/reproducing apparatus includes a signal generation unit that generates two-dimensional data by a two-dimensional encoding method in which a lower-limit value of a number of continuous ON/OFF pixels in an array in one direction of pixels in a two-dimensional spatial light modulator is K(K≧2, K: natural number); and a pickup that records the two-dimensional data, generated by the signal generation unit, on a hologram disc. | 06-06-2013 |
20130215730 | HOLOGRAPHIC MEMORY REPRODUCTION DEVICE AND HOLOGRAPHIC MEMORY REPRODUCTION METHOD, DEMODULATION DEVICE AND DEMODULATION METHOD, AND OBSERVATION DEVICE AND OBSERVATION METHOD - The present invention relates to a reproduction device of a holographic memory capable of precisely reproducing multi-value phase information without being influenced by noise. This holographic memory reproduction device comprises: a hologram diffraction ray generation unit which irradiates a first reference ray to the holographic memory and generates a diffraction ray of the first hologram; a hologram generation unit which changes the phase of a second reference ray which may interfere with the diffraction ray of the first hologram and generates a second hologram from the diffraction ray of the first hologram and the second reference ray to which the phase has been changed; a detection unit which detects the intensity distribution of the second hologram; and a processing unit which demodulates the phase modulation signal or the space quadrature amplitude modulation signal on the basis of the intensity distribution. | 08-22-2013 |
20130258832 | TEST ELEMENT HAVING AN OPTICAL DATA STORAGE, DEVICE FOR READING THE OPTICAL DATA STORAGE OF THE TEST ELEMENT AND MEASURING SYSTEM THEREOF - A test element is disclosed for analyzing a human or animal body fluid sample. The test element includes a substrate carrying a test field with a reagent for effecting a detection reaction when exposed to the body fluid sample, and an optical data storage in which data regarding the test element, preferably calibration data, is stored. Accordingly, the data storage is a holographic data storage. A hologram reader also is disclosed for reading the data storage of such a test element. Moreover, a hologram label and a method for manufacturing a hologram label are disclosed, as is a medical product including a holographic data storage in which data regarding the product is stored. | 10-03-2013 |
20130322224 | HOLOGRAPHIC OPTICAL PICKUP DEVICE, OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE, AND METHOD OF RECORDING AND REPRODUCING OPTICAL INFORMATION - A holographic optical pickup device includes an image sensor that detects a diffracted beam generated from the region to be reproduced when irradiating an optical information recording medium with a reference beam, and sets the detected diffraction beam as a reproduction signal, and a photodetector that is different from the image sensor, which detects the diffracted beam generated from a recorded region in the recording medium when irradiating the recording medium with the reference beam. A light receiver of the photodetector is divided into a plurality of light receiving planes so as to generate the position error signal indicating the positional shifting of the region to be recorded/reproduced of the recording medium with respect to the objective lens from a differential signal of a plurality of signals derived from the respective light receiving planes. | 12-05-2013 |
20130322225 | HOLOGRAPHIC OPTICAL PICKUP DEVICE, OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE, AND METHOD OF RECORDING AND REPRODUCING OPTICAL INFORMATION - An optical pickup device includes a galvanometer mirror that changes an incident angle of a reference beam to an optical information recording medium, an image sensor that detects a diffracted beam from a region to be reproduced upon irradiation of the recording medium with the reference beam, and sets the detected diffracted beam to a reproduction signal, and a photodetector that detects the diffracted beam generated from a plurality of recorded regions upon irradiation of the recording medium with the reference beam. The photodetector includes a plurality of light receivers, and generates an angular error signal indicating positional shifting of the incident angle of the reference beam from a differential signal of a plurality of signals derived from the respective light receivers so as to control the angle of the galvanometer mirror. | 12-05-2013 |
20130343171 | OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS AND METHOD - There is disclosed an optical information recording/reproducing apparatus for optically recording and/or reproducing information in and from an optical recording medium. The apparatus has an oscillator light generator for generating oscillator light that is made to overlap and interfere with reproduced light from the optical recording medium, an oscillator light modulator for producing a given phase difference between the oscillator light and the reproduced light, a light detector for detecting interference light in which the oscillator light and the reproduced light overlap each other, a wavefront deviation detector for detecting an amount of wavefront deviation between the oscillator light and the reproduced light from an output from the light detector, and a compensation amount calculation unit for calculating a wavefront compensation amount from the amount of wavefront deviation. The phase difference produced by the oscillator light modulator is controlled based on the wavefront compensation amount. | 12-26-2013 |
20140003221 | OPTICAL INFORMATION RECORDING AND REPRODUCING METHOD AND DEVICE | 01-02-2014 |
20140029404 | HOLOGRAPHIC MEMORY APPARATUS AND METHOD FOR ADJUSTING INCIDENT ANGLE OF REFERENCE BEAM - A holographic memory apparatus includes an optical detector which receives reflected light of reference beam from the surface of a hologram recording medium. An incident angle of the reference beam is estimated on the basis of information on a focused position on the optical detector. When the incident angle is different from a target incident angle, the incident angle of the reference beam is adjusted according to a difference between the incident angle and the target incident angle. | 01-30-2014 |
20140119168 | HOLOGRAPHIC MEMORY INFORMATION ENCODING METHOD, HOLOGRAPHIC MEMORY RECORDING METHOD, AND HOLOGRAPHIC MEMORY DEVICE - Provided is an information encoding method and a holographic memory device which increase the amount of information per page of a holographic memory and reduce the bit error rate to ensure a larger multiplexing number. The holographic memory information encoding method expresses information of signal page data in a holographic memory as a multi-stage data using different resolution by block coding, and superimposes each data on a single page of signal page data. The multi-stage data using different resolution is realized by light amplitude data and phase data. The amplitude data is divided by area through block coding. When n odd-numbered ON bits exist in a divided area of the phase data, a phase of 2πs/n (where n and s are natural numbers) is imparted as s-th phase information to one value of binary data, and the same phase is imparted to the other value of binary data. | 05-01-2014 |
20140140184 | OPTICAL TAPE PICK UP UNIT WITH HOLOGRAPHIC OPTICAL ELEMENT - An optical tape pick up unit includes a holographic optical element and an aspheric objective lens. The holographic optical element splits a laser beam into first order beams and introduces pre-compensating wavefront error into the first order beams. The aspheric objective lens focuses the first order beams onto optical tape and introduces wavefront error into the first order beams having a magnitude similar to and polarity opposite that of the pre-compensating wavefront error. | 05-22-2014 |
20140160913 | OPTICAL INFORMATION RECORDING AND REPRODUCTION DEVICE, OPTICAL INFORMATION RECORDING DEVICE, METHOD FOR RECORDING AND REPRODUCING OPTICAL INFORMATION AND OPTICAL INFORMATION RECORDING MEDIUM - The present invention provides a technology which estimates the most suitable cure time which changes with the environment when recording a hologram and adjusts the cure time in real time, thereby enabling a suitable pre-cure or post-cure. When irradiating an optical information recording medium with cure light, the light transmitted from the optical information recording medium is detected by a detector and the irradiation time is adjusted by continuing irradiation until the intensity of the transmitted light detected exceeds a prescribed reference value. | 06-12-2014 |
20140185421 | OPTICAL INFORMATION REPRODUCING APPARATUS AND OPTICAL INFORMATION REPRODUCING METHOD - A method of calculating a reliability effective in a decoding process of hologram. An optical information reproducing apparatus that reproduces information with the use of the holography includes an image acquisition unit that reproduces two-dimensional data from a hologram disc, an image equalization unit that makes the two-dimensional data equal to target data having a target PR characteristic, a soft output decoding unit that decodes output data of the image equalization unit on the basis of the PR characteristic, and outputs a decoded result having a reliability, and an error correction unit that conducts an error correction of the data on the basis of the decoded result. | 07-03-2014 |
20140241140 | Optical Information Recording Apparatus, Optical Information Recording Method, Optical Information Reproducing Apparatus and Optical Information Reproducing Method - An optical information recording/reproducing apparatus and an optical information recording/reproducing method that record information using holography, wherein the optical information recording/reproducing apparatus includes a signal generation unit that generates two-dimensional data by a two-dimensional encoding method in which a lower-limit value of a number of continuous ON/OFF pixels in an array in one direction of pixels in a two-dimensional spatial light modulator is K(K≧2, K: natural number); and a pickup that records the two-dimensional data, generated by the signal generation unit, on a hologram disc. | 08-28-2014 |
20140301176 | OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS - An optical information recording/reproducing apparatus for recording information on a recording medium and/or reproducing information from the recording medium, includes: a laser light source for performing recording and/or reproducing information; a shielding part, using a liquid crystal, that can switch between transmission and interception of laser light emitted from the laser light source; a driving circuit for driving the switching between transmission and interception of the shielding part; a moving part for relatively moving the shielding part and the laser light; and a controlling circuit for controlling the moving part. The moving part relatively moves the shielding part and the laser light so as to switch a region to which the laser light is applied from a first region of the shielding part to a second region thereof different from the first region, in order to prevent the liquid crystal from deteriorating. | 10-09-2014 |
20140301177 | OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS AND OPTICAL INFORMATION RECORDING/REPRODUCING METHOD - An optical information recording/reproducing apparatus for recording an interference pattern between signal light and reference light information-multiplexed as a hologram in an optical information recording medium and for reproducing information recorded in the optical information recording medium on the basis of the recorded hologram with use of the reference light. The apparatus includes a light source for emitting light and a coherency controller for controlling a coherency of the light source. The apparatus controls the coherency controller in such a manner as to switch between a coherency required in a recording mode and a coherency required in a reproducing mode. | 10-09-2014 |
20140321254 | DATA RECORDING APPARATUS AND METHOD USING 3D OPTICAL MEMORY, AND AUTHENTICATION APPARATUS AND METHOD USING 3D OPTICAL MEMORY - A data recording apparatus and method using three dimensional (3D) optical memory and an authentication apparatus and method using 3D optical memory are provided. The data recording apparatus includes a recording excitation light splitting unit, a condition storage unit, and a data recording unit. The recording excitation light splitting unit splits recording excitation light into first split light and second split light. The condition storage unit stores recording conditions including information about the waveforms, wavelengths and phases of the split light and information about an arrangement of reflection mirrors configured to reflect the split light. The data recording unit records storage data by making the split light incident on the 3D optical memory through the reflection mirrors under the recording conditions. | 10-30-2014 |
20150063089 | Six-dimensional Optical Multilayer Storage Using Two-photon Absorption Writing, Erasing and Optical Coherence Tomography Reading - This invention relates a method of six-dimensional optical multilayer storage using two-photon absorption writing, erasing and optical coherence tomography reading and the apparatus designed based on this method. The invented system stores data in three spatial dimensions plus three physical dimensions of wavelength, intensity and polarization. It has large storage capacity of over 32 Tbytes per DVD sized disk and ultrafast reading speed of over 25 Gbits/s with high signal-to-noise ratio of over 76 dB. The larger capacity of over 1 Pbyte per disk is potential. Furthermore, the invented system has relatively simple optical structure, easy light manipulation for addressing the storage cell and high compatibility with the CDs and DVDs. It is an actually practicable optical large capacity storage technology. | 03-05-2015 |
20150071046 | STACKED FILM REFLECTIVE LAYERS FOR MULTI-LAYER OPTICAL DATA STORAGE - A component comprising a stacked interleaved film structure that includes a plurality of layers inert to light. Alternating layers are either doped with a reverse saturable absorber (RSA) material or the RSA material is located between the adjacent inert layers. In some embodiments, the inert alternating layers have different refractive indices. A data storage device and methods of manufacture are also disclosed. | 03-12-2015 |
20150078149 | OPTICAL INFORMATION REPRODUCING DEVICE AND REFERENCE BEAM ADJUSTING METHOD - An optical information reproducing device includes: a light source that emits light to the optical information recording medium; a light source control unit that controls a wavelength of the light emitted from the light source; a reference beam angle control unit that controls an incidence angle of the reference beam to the optical information recording medium; a light detector that detects a reproduction image from the optical information recording medium or a brightness distribution of the reproduction image; a reproduction image processing unit that detects a bright line of the reproduction image on the basis of a detection result of the light detector and outputs a detection result of the bright line; and a controller that controls the wavelength of the light emitted from the light source, on the basis of an output of the reproduction image processing unit, and controls the incidence angle of the reference beam. | 03-19-2015 |
20150085633 | OPTICAL INFORMATION RECORDING APPARATUS AND OPTICAL INFORMATION RECORDING METHOD - An optical information recording apparatus configured to record information into an information recording medium by using holography, the apparatus including: a signal generation unit configured to generate two-dimensional data; and a two-dimensional spatial light modulator unit configured to display the two-dimensional data and to spatially modulate a transmitted or reflected beam, wherein the two-dimensional spatial light modulator unit includes a signal region and an external region, the signal region displays two-dimensional data based on user data, the external region displays two-dimensional data not including the user data, and the signal generation unit generates two-dimensional data in such a manner that a frequency of the two-dimensional data displayed on the external region becomes equal to or larger than a frequency of the two-dimensional data displayed on the signal region. | 03-26-2015 |
20150109895 | OPTICAL INFORMATION REPRODUCING APPARATUS, OPTICAL INFORMATION REPRODUCING METHOD, AND OPTICAL INFORMATION RECORDING METHOD - When books are densely bedded on a recording medium for recording a hologram on the medium with a high density, the books need to be positioned at a reference light irradiation position with a high precision when reproducing. An optical information reproducing apparatus for producing information from an optical information recording medium, includes: a light source that emits a reference light; an angle adjustment part that adjusts an incident angle of the reference light emitted from the light source to the optical information recording medium; a filter part that suppresses an unnecessary light of a diffracted light obtained when the optical information recording medium is irradiated with the reference light adjusted by the angle adjustment part; a light detection part that detects at least a part of the diffracted light obtained by irradiating the optical information recording medium with the reference light adjusted by the angle adjustment part; and a control part that controls the filter part, wherein at least a part of page data within an adjacent book is recorded as information on the optical information recording medium while deviating the incident angle of the reference light in an angle multiplexing direction, and wherein the control part controls the filter part on the basis of the signal detected by the light detection part. | 04-23-2015 |
20150131424 | OPTICAL INFORMATION RECORDING/REPRODUCTION DEVICE, RECORDING CONDITION ADJUSTMENT METHOD, AND OPTICAL INFORMATION RECORDING MEDIUM - An optical information recording/reproduction device appropriately adjusting a recording condition and a method and a medium therefor are provided in order to cope with a problem that the signal-to-noise ratio (SNR) during reproduction decreases, unless the condition during recording is adjusted, because of variation in the environment during recording, variation of components such as laser output, variation of production of the device, and the like in the optical information recording/reproduction device using holography. In an optical information recording/reproduction device configured to record or reproduce information to an optical information recording medium by using holography, a recording condition is adjusted, before user data are recorded, in an adjustment area provided for recording condition adjustment in an optical information recording medium. | 05-14-2015 |
20150294681 | OPTICAL INFORMATION RECORDING DEVICE, OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE, OPTICAL INFORMATION RECORDING METHOD, OPTICAL INFORMATION RECORDING AND REPRODUCING METHOD, AND OPTICAL ELEMENT - The optical information recording and reproducing method realizes an increased number of multiplexing in recording and favorably stabilized signal recording in a manner of uniforming media consumption in angle-multiplexed recording by changing a phase of signal light on a pixel basis in a manner in which the speed of a phase change on a pixel basis is constant or is greater than or equal to a certain speed in a page and between pages when the driving speed of a phase mask changes at the time of recording. The optical information recording and reproducing method, while moving an optical element that adds phase information to a light flux which includes two-dimensional page data information in a direction that is perpendicular to an optical axis of the light flux, records the page data on the recording medium by adding the phase information to the light flux. | 10-15-2015 |
20150294682 | OPTICAL INFORMATION APPARATUS - In order to correct signal-to-noise ratio degradation caused by a position error of an aperture filter relative to a signal beam and ensure a high recording signal quality in an optical information apparatus using holography, an optical detection system capable of conducting position adjustment of the aperture filter by using the signal beam is provided and the aperture filter is positioned with high precision. | 10-15-2015 |
20150318009 | OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE, OPTICAL INFORMATION RECORDING AND REPRODUCING METHOD - An optical information recording and reproducing device that records information on a recording medium and/or reproduces information on the recording medium, using holography is configured to include a laser light source that performs irradiation with laser light, a first light-shielding portion which is capable of switching between transmission and shielding of laser light emitted from the laser light source, and a driving circuit that drives the switching between transmission and shielding of the first light-shielding portion, and a first movement portion that moves the first light-shielding portion. | 11-05-2015 |
20150318010 | OPTICAL PICKUP AND OPTICAL RECORDING AND REPRODUCING DEVICE - An optical pickup includes a light source | 11-05-2015 |
20150340055 | OPTICAL INFORMATION RECORDING AND REPRODUCING APPARATUS AND OPTICAL INFORMATION RECORDING AND REPRODUCING METHOD - To provide an optical information recording and reproducing apparatus capable of correct positioning, in an optical information recording and reproducing apparatus which branches a light beam into reference light and signal light to cause interference and records an obtained interference fringe as a hologram on an optical information recording medium and reproduces the hologram recorded by applying the reference light onto the optical information recording medium, the apparatus has an image pickup element which detects reproduction light passing through an aperture | 11-26-2015 |
20150380039 | OPTICAL INFORMATION REPRODUCTION DEVICE AND OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE - A position control method at high speed and high accuracy for recorded hologram is obtained. An optical information recording and reproducing device records an interference fringe obtained by interfering reference beam and signal beam as a hologram on an optical information recording medium and reproduces information using the reference beam from the hologram recorded on the optical information recording medium. The optical information recording and reproducing device includes: a detection light generation unit that generates light including a part of the signal beam as detection light; a detection light incident unit that causes the detection light to be incident on the recorded hologram; and a light detection unit that detects a light amount of diffracted beam by the detection light incident on the hologram. A position of the recorded hologram is detected based on an output of the light detection unit. | 12-31-2015 |
20160049170 | OPTICAL INFORMATION RECORDING AND RECONSTRUCTING DEVICE - During reconstruction, the hologram cannot be reconstructed at high speed. In the present invention, the distance between the optical system base point, which is associated with a recording medium address during recording, and the recording medium is measured, and said distance is recorded in a memory. During reconstruction, distance information, which is the distance of the recording medium from the memory that is associated with a recording medium reconstruction address, is read, and the position of an aperture filter is adjusted at high speed in the optical axis direction on the basis of the read distance information and a distance measurement result for the optical system base point during reconstruction and the recording medium. Thus, the relative positions of the hologram within the recorded medium associated with the optical system during reconstruction and during recording can be matched. | 02-18-2016 |
20160055875 | HOLOGRAM RECORDING AND REPRODUCING DEVICE, AND ANGULAR MULTIPLEXING RECORDING AND REPRODUCING METHOD - A hologram recording and reproducing device and an angular multiplexing recording and reproducing method capable of detecting an angular error signal for which, in a two-beam angle multiplexing method, high-speed reproducing can be achieved with a superior recovered signal. A branch element branches a light beam, emitted from a light source, into a signal light and a reference light. Angle-variable elements modify the incident angle of the reference light that is incident to the optical information recording medium. A spatial light modulator adds information to the signal light; and an objective lens radiates the signal light to the optical information recording medium. An imaging element detects diffracted light generated from a recording region when the reference light is radiated upon the optical information recording medium; a detection system detects at least two angular error signals for controlling the angle-variable elements; and switching is performed between the two angular error signals. | 02-25-2016 |
20160085212 | OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS, OPTICAL INFORMATION RECORDING/REPRODUCING METHOD AND DATA ARCHIVING SYSTEM - In a hologram recording/reproducing apparatus where a wavelength-variable laser diode having the external resonator structure is used as its light-source, stable recording/reproducing quality is ensured with respect to a change in the recording/reproducing wavelength against the expansion or contraction of a hologram medium caused by the hologram recording and the temperature change. When the output wavelength from the wavelength-variable laser diode is changed to a predetermined target wavelength, the temperature of the laser light-emission part of the wavelength-variable laser diode is controlled by a temperature control element so that the wavelength band, within which the light-emission power of the laser light-emission spectrum is higher than a predetermined light-emission power, includes the above-described predetermined target wavelength. | 03-24-2016 |
20160086628 | Optical Component Positioning Device and Optical Recording Device Using Same - Diffracted light generated by a recording medium in reproduction is largely blocked by a spatial filter because of a position shift of the recording medium. Thus, the light amount of the diffracted light converged onto an optical detector is reduced and a satisfactory level of a reproducing signal cannot be obtained. In addition, in recording, it is necessary to fix the position of the spatial filter in rays for removing unnecessary frequency components or the like in a light beam emitted from a light source. In actuators having at least two spatial filters, one spatial filter is mounted on an actuator driven along two or more axes and moves independently of another spatial filter, and the other spatial filter is fixed to a common one-axis actuator. Switching of the positions of the spatial filters is performed by the common one-axis actuator. | 03-24-2016 |
20160111123 | OPTICAL INFORMATION RECORDING/REPRODUCTION DEVICE AND ADJUSTMENT METHOD - The optical information recording/reproduction device for recording information by irradiating an optical information recording medium with signal light and reference light to form a hologram, and reproducing the information by irradiating the hologram with the reference light, wherein the optical information recording/reproduction device is provided with a branching element for branching laser light from a laser light source into signal light and reference light, a spatial light modulation unit for adding two-dimensional information to the signal light, an objective lens for irradiating an optical information recording medium with the signal light, a photodetector for detecting diffracted light from the optical information recording medium when irradiated with the reference light, and an optical axis adjustment unit disposed between the laser light source and the branching element, the optical axis adjustment unit adjusting the optical axis of the laser light. | 04-21-2016 |
20160118074 | HOLOGRAPHIC DATA REPRODUCTION APPARATUS AND METHOD THEREOF - A holographic data reproduction apparatus is provided. The holographic data reproduction apparatus includes: a charged-coupled device (CCD) that photographs diffracted-light from a recording medium irradiated with reference light, wherein the diffracted-light corresponds to a data page, an operation unit that calculates an optimal threshold value by applying a fitness function (Fit) to a genetic algorithm for detecting a number of error bits of the data page corresponding to the diffracted-light, a control unit that determines an output value of each pixel of the data page based on the optimal threshold value, and a decoding unit that decodes and outputs reproduction data according to the output value of the each pixel. Accordingly, it is possible to minimize a bit error rate (BER) and accurately reproduce holographic data. | 04-28-2016 |
20160118076 | OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS - A hologram apparatus and hologram optical system includes: a light source which emits a light beam; a splitter which splits the light beam emitted from the light source into a first light beam and a second light beam; a first lens for exposing an optical information recording medium to convergent light of the first light beam; an optical path angle varying device which causes the second light beam to become incident at substantially the same position as the first light beam in the optical information recording medium and changes an angle of incidence of the second light beam incident on the optical information recording medium; and an optical path shifting element which shifts a position of a light beam incident on the optical information recording medium, according to an angle to the optical information recording medium of the light beam incident on the optical information recording medium. | 04-28-2016 |
20160125906 | HOLOGRAM REPRODUCING DEVICE AND HOLOGRAM REPRODUCING METHOD - A hologram reproducing device which reproduces information from a recording medium having information recorded by interfering a signal beam and a reference beam, provided with a first light-angle change unit which changes an irradiation angle of the reference beam; a second light-angle change unit which changes the irradiation angle of the reference beam; a photodetector which detects a reproduction beam; a first light-angle drive-signal output unit which outputs a drive signal of the first light-angle change unit; a first light-angle control unit which controls the first light-angle change unit on the basis of the output of the photodetector; a second light-angle drive-signal output unit which outputs a drive signal of the second light-angle change unit; a second light-angle control unit which controls the second light-angle change unit; and a light-angle interpolation processing unit which controls a control target value of the second light-angle control unit. | 05-05-2016 |
20160196849 | HOLOGRAPHIC DATA STORAGE SYSTEM | 07-07-2016 |
20170236543 | OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE AND HOLOGRAPHIC RECORDING/REPRODUCING METHOD | 08-17-2017 |