| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 359010000 | Using modulated or plural reference beams | 73 |
| 20080204835 | Apparatus for reading from and/or writing to holographic storage media - The present invention relates to an apparatus for reading from and/or writing to holographic storage media, and more specifically to an apparatus for reading from and/or writing to holographic storage media having an improved overlap between one or more reference beams and an object beam or a reconstructed object beam. According to the invention, the apparatus has a common aperture arrangement of a reference beam and an object beam or a reconstructed object beam, wherein the focus of the reference beam is shifted relative to the focus of the object beam or the reconstructed object beam within a focal plane of the object beam or the reconstructed object beam inside or close to the holographic storage medium. | 08-28-2008 |
| 20080231923 | Holographic recording apparatus - The present invention relates to a holographic recording apparatus that records on a multiple basis information on a holographic memory. An object of the present invention is to provide a holographic recording apparatus capable of avoiding problems of recording error of data and destruction of the existing data, which will occur when the medium of the specification shortages is used. | 09-25-2008 |
| 20090021812 | DEVICES FOR RECORDING OR READING OUT AN ENCODED HOLOGRAM - The invention relates devices for recording or reading out an encoded hologram. Said devices are arranged to record or to read out spatially separated data structures, as well as mutually spatially separated data holograms ( | 01-22-2009 |
| 20090021813 | System and method for electronically displaying holographic images - A system and method for displaying holographic images to the naked eye. The scattering of light by objects in real space is simulated using a two-dimensional holographic display, giving images depth. The display comprises a plurality of small holographic pixels, each displaying a different perspective of the three dimensional space. In some embodiments, digital micromirror devices (DMDs), which are a well developed technology, are combined with simple optical lenses. Other embodiments include the ability to display holographic images from a distant source in real time, or from a recording. | 01-22-2009 |
| 20090103152 | Common aperture holographic storage system with reduced noise - The present invention relates to an apparatus for reading from and/or writing to holographic storage media, and more specifically to a common aperture type apparatus for reading from and/or writing to holographic storage media with multiple reference beams having a reduced noise. | 04-23-2009 |
| 20090116085 | Optical system and projection display device - An optical system capable of outputting hi-contrast images and multi-primary color or 3-dimensional images is provided. Light in primary colors RGB modulated in a first modulation optical system is transmitted through a relay lens | 05-07-2009 |
| 20090190195 | Method of digitally processing optical waves and an integrated planar optical device based on digital planar holography - An integrated planar optical device having a holographic pattern based on digital planar holography [incomplete sentence]. The device consists of a semiconductor substrate that supports a plurality of planar optical elements and a lower cladding layer. The lower cladding layer supports a light-propagating and distributing layer, embedded into which is a plurality of interconnecting pattern elements of a holographic pattern intended for controlling properties and directions of light beams propagating to and from the aforementioned planar optical elements in accordance with the holographic pattern. This is achieved by providing specific positions, shapes, and a refractive index of pattern elements that are different from the refractive index of the material of the layer that contains these elements. The method of designing and manufacturing the aforementioned pattern is described. | 07-30-2009 |
| 20090219593 | Reflection type collinear holographic storage system - A reflection type collinear holographic storage system is described, in which an improved overlap between an object beam and a reference beam is achieved. | 09-03-2009 |
| 20090237760 | Holographic storage system with multiple reference beams - Holographic storage system with multiple reference beams An apparatus for reading from and/or writing to holographic storage media is described, and more specifically an apparatus for reading from and/or writing to holographic storage media with two or more reference beams that overlap inside the holographic storage medium for reading and/or writing a single hologram. The two or more reference beams are mutually incoherent during reading and/or writing. | 09-24-2009 |
| 20090262405 | Holographic storage system with reduced noise - An apparatus for reading from and/or writing to transmission type holographic storage media is proposed, and more specifically a coaxial type apparatus for reading from and/or writing to transmission type holographic storage media with two or more reference beams, which has an improved Signal to Noise Ratio. | 10-22-2009 |
| 20100195177 | Method for forming multilayer reflection hologram in optical recording medium - A method for forming an information recording layer including a multilayer stack of reflection hologram layers modulated in the depth direction of a hologram material layer is provided. The method includes: generating a first pair of polarized coherent laser beams and a second pair of polarized coherent laser beams that are incoherent with the first pair; directing the first pair of polarized coherent laser beams to the hologram material layer from opposite sides thereof, respectively, such that the incident angles of the first pair are symmetric with respect to the hologram material layer; directing the second pair of polarized coherent laser beams to the hologram material layer from the opposite sides thereof, respectively, at incident angles different from the incident angles of the first pair; and forming the multilayer stack of reflection hologram layers according to the interference pattern of the first and second pairs of polarized coherent laser beams. | 08-05-2010 |
| 20100253986 | DIGITAL HOLOGRAPHY DEVICE AND PHASE PLATE ARRAY - Provided is a digital holography device having a simple configuration and an improved image quality, including: a light source that emits light, the light source being provided for supply of object light beams formed by radiation, transmission, scattering, reflection, or diffraction of the emitted light from a subject; an array device that splits the light emitted from the light source into two kinds of reference light beams having different phases in a plane perpendicular to a direction in which the light emitted from the light source travels; a CCD camera having an image-capturing plane on which two kinds of interference fringe patterns are recorded, the interference fringe patterns being formed by interferences between the two kinds of reference light beams, which have been produced by the array device, and the object light beams, which have been formed by radiation, transmission, scattering, reflection, or diffraction from the subject; and an image reconstruction device that generates a reconstructed image of the subject from the two kinds of interference fringe patterns recorded on the image-capturing plane. | 10-07-2010 |
| 20100265553 | METHOD AND DEVICE FOR PRODUCING COLORED INDIVIDUALIZED HOLOGRAMS - A method produces colored individualized holograms for use as security elements for documents, and to a device for producing individualized holograms. The method generates light formed of different colors, spatially modulates the light, color by color, in an individual manner, optically guides the modulated light such that the light is at least partially refracted and/or reflected on a holographic master and is superposed in a holographic recording material with the modulated non-refracted and/or reflected light, and records the hologram. The light is modulated, color by color and at the same time, by a plurality of spatial light modulators. Every color is associated with its own spatial light modulator and a plurality of monochrome modulated light beams of the plurality of colors is combined in a collinear manner prior to refraction and/or reflection on the holographic master and the superposition in the recording material to give a multicolor exposure light beam. | 10-21-2010 |
| 20120194885 | NANOSTRUCTURED ACOUSTO-OPTIC DEVICE, AND OPTICAL SCANNER, OPTICAL MODULATOR, AND HOLOGRAPHIC DISPLAY APPARATUS USING THE NANOSTRUCTURED ACOUSTO-OPTIC DEVICE - An acousto-optic device capable of increasing a range of a diffraction angle of output light by using a nanostructured acousto-optic medium, and an optical scanner, an optical modulator, a two-dimensional/three-dimensional (2D/3D) conversion stereoscopic image display apparatus, and a holographic display apparatus using the acousto-optic device. The acousto-optic device may include a nanostructured acousto-optic medium formed by at least two different mediums repeatedly alternating with each other, wherein at least one of the at least two different mediums includes an acousto-optic medium. The acousto-optic device having the aforementioned structure may increase the range of a diffraction angle of output light. Thus, various systems such as the optical scanner, the optical modulator, the 2D/3D conversion stereoscopic image display apparatus, and the holographic display apparatus may not require a separate optical system to increase an operational angle range, thereby decreasing a size of the system and/or improving a resolution of the system. | 08-02-2012 |
| 20120327491 | HOLOGRAPHIC DISPLAY SYSTEM WITH MOTION SENSORS - A holographic display system with motion sensors is disclosed. In one embodiment, the holographic display system is a flat screen display having display screen and a holographic overlay positioned over the display screen. A plurality of sensors are embedded in the holographic overlay. Alternatively, the plurality of sensors may be attached to a substrate, which is positioned behind the display screen. In another embodiment, the holographic display system is a projection type display in which image beams are projected from an image projector onto a holographic screen. A plurality of sensors are located on the holographic screen. In yet another embodiment, a method for sensing a user's movement using a holographic display system with motion sensors is shown. | 12-27-2012 |
| 20130057935 | APPARATUS FOR THE EXACT RECONSTRUCTION OF THE OBJECT WAVE IN OFF-AXIS DIGITAL HOLOGRAPHY - A method for preparing a digital hologram representing an image of an object, which includes generating a measurement beam and a first reference beam, irradiating the object by the measurement beam and guiding the measurement beam reflected to an optical sensor. The method also includes guiding the first reference beam to a first mirror, extending under an angle different from 90° with the optical axis of the first reference beam, and guiding the reflected beam to the optical sensor so that both beams generate an interference pattern on the sensor. The method further includes reading out the sensor and providing a digital signal representing the interference pattern on the optical sensor, and processing the signal to obtain a digital hologram. | 03-07-2013 |
| 20130271801 | HOLOGRAPHIC IMAGE FORMING SYSTEM - A holographic image forming system is provided. The use of an image slicing process and/or the arrangement of half-cylindrical lens in the optical path of an optical light wave and upstream of the film is effective to reduce the times of multiple exposures of the film. As a consequence, the brightness of the reconstructed image is enhanced. | 10-17-2013 |
| 20130271802 | COLOR HOLOGRAPHIC IMAGE FORMING SYSTEM - A color holographic image forming system is provided. The reference light wave is incident to the film at a fixed reference beam angle. By adjusting an included angle between the object light wave corresponding to respective monochromatic component images and the reference light wave, the reference light wave and the object light wave are interfered with each other to result in a plurality of interference fringes on the film. When a white light is projected on the film, the reconstructed image shows the color effect. | 10-17-2013 |
| 20130271803 | HOLOGRAPHIC IMAGE FORMING SYSTEM - A holographic image forming system is provided. The holographic image forming system includes an illumination unit, a beam splitting unit, a reference beam processing unit, an image generating unit, an object beam processing unit, and a film. The reference beam processing unit is used to generate a reference light wave carrying an image information of a target object. The reference light wave is incident to the film. Consequently, the times of multiple exposures of the film are reduced, and the brightness of the reconstructed image is enhanced. | 10-17-2013 |
| 20130278981 | Device and Method for Holographic Reflection Imaging - Methods and devices for holographic imaging are disclosed. In some embodiments, a holographic imaging device is disclosed that includes at least one radiation source, a reflective surface, and an image sensor. The at least one radiation source may be configured to emit a radiation wave towards the reflective surface and an object positioned on or near the reflective surface, where the radiation wave is reflected by the reflective surface to produce a reference wave and is reflected directly toward the image sensor by the object to produce an object wave directed at the image sensor. Further, the image sensor may be configured to determine an interference pattern between the reference wave and the object wave. A holographic image representing the object may be reconstructed based on the interference pattern. | 10-24-2013 |
| 20140022615 | CURVED VOLUME PHASE HOLOGRAPHIC (VPH) DIFFRACTION GRATING WITH TILTED FRINGES AND SPECTROGRAPHS USING SAME - The subject matter described herein includes a curved VPH grating with tilted fringes and spectrographs, both retroreflective and transmissive, that use such gratings. A VPH grating according to the subject matter described herein includes a first curved surface for receiving light to be diffracted. The grating includes an interior region having tilted fringes to diffract light that passes through the first surface. The grating further includes a second curved surface bounding the interior region on a side opposite the first surface and for passing light diffracted by the fringes. | 01-23-2014 |
| 20140063578 | APPARATUS FOR RECORDING AND REPRODUCING HOLOGRAM - A hologram recording and reproducing apparatus including: a coherent light source; a beam splitter which splits a beam emitted from the coherent light source into a signal beam and a reference beam; a signal beam forming unit which modulates the signal beam split and directs the modulated signal beam onto a hologram recording medium; and a reference beam forming unit which directs the reference beam to be irradiated onto a location on the hologram recording medium which overlaps with a location on the hologram recording medium on which the signal beam is incident, wherein the signal beam forming unit includes: a first light guide member which transmits the signal beam split by the beam splitter; a spatial light modulator (SLM) which modulates the signal beam transmitted through the first light guide member; and a holographic Fourier transformation optical device which focuses the modulated signal beam onto the hologram recording medium. | 03-06-2014 |
| 20140132999 | OPTICAL HEAD FOR HOLOGRAM OPTICAL APPARATUS AND METHOD OF OPERATING THE SAME - An optical head for a hologram optical apparatus and a method of operating the same are provided. The optical head for the hologram optical apparatus includes a reference light unit for guiding reference light, a signal light unit for guiding signal light, and a light source unit for providing 1 the reference light and the signal light to the reference light unit and the signal light unit, wherein the reference light unit and the signal light unit are stacked. The signal light unit includes: a plurality of optical waveguides stacked sequentially; composite hologram optical elements and lighting hologram optical elements disposed on the plurality of optical waveguides; an optical modulator for modulating light output from the plurality of the optical waveguides; and a lens for condensing light output from the optical modulator onto a recording layer. | 05-15-2014 |
| 20140253988 | HOLOGRAM GENERATING APPARATUS - A hologram generating apparatus and method. In one embodiment of the apparatus includes a base and a rigid platform. The rigid platform is movably coupled to the base. Several components are fixedly attached to the rigid platform and are movable relative to the base. For example, a source for emitting an electromagnetic beam, a beam splitter for splitting the electromagnetic beam into an object beam and a reference beam, a reference beam component for receiving the reference beam, and an object beam component for receiving the object beam are each fixedly mounted to the rigid platform. | 09-11-2014 |
| 20140268263 | MULTI-CHANNEL SIMULTANEOUS PHOTOSTIMULATION - A photomanipulation device is described that includes multiple spatial light modulators (SLMs). By having more than one SLM, this device can simultaneously photomanipulate different areas with different wavelengths and/or it can rapidly switch between different areas with speeds faster than a single device is capable of. This device is particularly useful for photostimulation of neurons where simultaneity and precision timing is required. | 09-18-2014 |
| 20150293495 | PRODUCING IMAGES OF SECURITY FEATURES - Processes and systems are described that can produce images including both three dimensional holographic images and two dimensional variable data, which can provide personalized security features in a document. A photosensitive film can be pressed against a first reflective optical device. A laser beam can be directed through a selected first area of the photosensitive film onto the first reflective optical device to produce a three dimensional holographic image in the photosensitive film. A previously masked second area of the photosensitive film can be pressed against a second reflective optical device. The laser beam can project an image constructed by a spatial light modulator and can be directed through the second area of the photosensitive film onto the second reflective optical device to produce a two dimensional image in the second area. During the process, the web tension of the photosensitive film is controlled. | 10-15-2015 |
| 359011000 | Spatial, phase or amplitude modulation | 47 |
| 20080225360 | HOLOGRAM RECORDING/REPRODUCING APPARATUS - A hologram recording/reproducing apparatus includes: a coherent light source; a spatial light modulator which spatially modulates light from the coherent light source; a Fourier transform lens which concentrates light modulated by the spatial light modulator upon a hologram medium; and a two-dimensional light-receiving element array which receives light from the hologram medium. The spatial light modulator is divided into a reference light area and a signal light area, and the divergence angle of reference light emitted from the reference light area is wider than the divergence angle of signal light emitted from the signal light area. | 09-18-2008 |
| 20080239419 | Hologram Reproduction Apparatus and Hologram Reproduction Method - A hologram reproducing apparatus is provided that can be reduced in size. A hologram reproducing apparatus of the invention reproduces signal information from a recorded media having a domain of diffraction grating that is irradiated with a record light beam containing a coherent reference light component and a signal light component spatially modulated according to the signal information substantially on the same optical axis and is recorded an interference of the reference light component and the signal light component. The hologram reproducing apparatus comprises a light source for emitting a coherent light beam, a light-beam irradiator for irradiating the light beam to the domain of diffraction grating of the recording medium, a light collector for collecting a reproduced light beam reproduced by irradiating the light beam to the domain of diffraction grating toward a convergent position, an incident-light processing unit provided at the convergent position and for separating a Fourier 0-order component of the reproduced light beam and a diffraction light component of the reproduced light beam, and a detecting section for detecting the signal information from the diffraction component. | 10-02-2008 |
| 20080239420 | AGILE HOLOGRAPHIC OPTICAL PHASED ARRAY DEVICE AND APPLICATIONS - A device that provides light beam switching, agile steering of the light beam over a range of angles, and generation of arbitrary wavefront shapes with high spatial and temporal resolution. The agile device can include a volume diffractive structure comprising Bragg planes having one refractive index and the Bragg planes separated by regions containing an active optical medium. Electrodes (which may be the Bragg planes themselves, or may be arrayed adjacent to the active optical medium) are used to control the electric field intensity and direction across the structure, and thereby control the diffraction efficiency of the structure and the local phase delay imposed on a diffracted wavefront. Means are provided for addressing the many thousands of electrodes required for precise and rapid wavefront control. Applications include free-space atmospheric optical communications, near-eye displays, direct-view 3D displays, optical switching, and a host of other applications. | 10-02-2008 |
| 20080239421 | HOLOGRAM RECORDER - A hologram recorder is provided, in which coherent light from a light source is split into a signal beam and a reference beam, and the signal beam is modulated by a spatial light modulator to be directed to a hologram recording medium, while the reference beam is directed to the hologram recording medium to overlap with the signal beam for recording a hologram on the hologram recording medium. The hologram recorder includes a beam phase modulator provided with a plurality of optical devices ( | 10-02-2008 |
| 20080259420 | Apparatus for reading from and/or writing to holographic storage media - The present invention relates to an apparatus for reading from and/or writing to holographic storage media with a simplified common aperture setup. | 10-23-2008 |
| 20080316557 | HOLOGRAPHIC RECORDING/REPRODUCING APPARATUS - A holographic recording/reproducing apparatus that easily controls an incident angle of a reference beam and that is less sensitive to a tilt of a holographic recording medium, the holographic recording/reproducing apparatus including: a light source to emit a light; and an optical system to divide the emitted light into a reference beam and a signal beam, and to provide the reference beam and the signal beam to the holographic recording medium, wherein the optical system provides the signal beam to be incident on an upper surface of the holographic recording medium, and provides the reference beam to be guided along the inside of the holographic recording medium by reflection due to a refraction index difference between the holographic recording medium and the outside of the holographic recording medium. | 12-25-2008 |
| 20090015889 | VOLTAGE CONTROL CIRCUIT, VOLTAGE CONTROL METHOD AND LIGHT CONTROL APPARATUS UTILIZING THE SAME - A voltage control circuit which can prevent the occurrence of imprint phenomenon is provided. | 01-15-2009 |
| 20090040577 | System and method for holographic storage - A system and a method for holographic storage mainly involve forming a holographic interference pattern in a holographic recording medium. The holographic storage system utilizes a light source to emit a coherent beam. The coherent beam is irradiated to a first reflector to form a divergent beam. The divergent beam is then irradiated to a second reflector to form collimating beams (a signal beam and a reference beam). The signal beam goes through a spatial light modulator (SLM) and is modulated by the SLM. After that, the reference beam and the modulated signal beam are irradiated to a convergent unit, and are directed to the holographic recording medium for forming the holographic interference pattern. The holographic storage system that the light source is split into a signal beam and a reference beam by a set of reflectors according to the reflection principle without involving refraction may employ wavelength multiplexing. | 02-12-2009 |
| 20090059328 | HOLOGRAM READING APPARATUS, HOLOGRAM READING METHOD, HOLOGRAM RECORDING APPARATUS AND HOLOGRAM RECORDING METHOD - A hologram reading apparatus includes: a unit holding a hologram recording medium in which data page is recorded by irradiating as a single beam both reference light and signal light modulated by a spatial light modulator including a first pixel area for modulating the reference light and a second pixel area for modulating the signal light, a pitch of pixels in the first pixel area being different from that in the second pixel area; a Fourier transform lens subjecting reproduction light to a Fourier transformation; a filter disposed on a Fourier transform plane of the reproduction light by the Fourier transform lens, the filter shielding the reference light at a first spatial frequency band and transmitting the signal light at a second spatial frequency band; and a reading unit receiving the reproduction light transmitted through the filter and reading the data page modulated to the signal light included in the reproduction light. | 03-05-2009 |
| 20090147330 | Laser processing apparatus - A laser processing apparatus includes a laser source ( | 06-11-2009 |
| 20090231650 | OPTICAL REPRODUCTION DEVICE, OPTICAL RECORDING/REPRODUCTION DEVICE, AND OPTICAL REPRODUCTION METHOD - There is provided an optical reproduction device that reproduces a hologram that is recorded on an optical recording medium by interference between a signal light and a reference light coaxial to the signal light. The device has: a coherent light source; a light distribution unit distributing light from the light source, to a signal light optical path and a reference light optical path; a spatial light modulator that includes a signal light region and a reference light region, a spatial light modulator, a first irradiation optical system spatially separating light distributed to the reference light optical path and light distributed to the signal light optical path, making optical axes of both lights coincide, and irradiating the both lights onto the spatial light modulator; and a second irradiation optical system irradiating reference light onto the optical recording medium as reading light, and reproducing the hologram. | 09-17-2009 |
| 20090251750 | OPTICAL REPRODUCING METHOD AND OPTICAL REPRODUCING APPARATUS - An optical reproducing method is provided. A diffracted light is generated by irradiating a reference light onto a hologram. A combined light is generated by applying a direct-current component formed by a polarized light having a third polarization component with a first polarization plane having a polarization direction orthogonal to the diffracted light and having the same phase as the diffracted light, and a fourth polarization component with a second polarization plane having an opposite phase to the diffracted light, onto the diffracted light. The combined light is separated into a fifth polarization component including a first polarization component and the third polarization component, and a sixth polarization component including a second polarization component and the fourth polarization component. A first reproduced image is reproduced from the separated fifth polarization component, and a second reproduced image is reproduced from the separated sixth polarization component. | 10-08-2009 |
| 20090262406 | RECORDING DEVICE, RECORDING/REPRODUCING METHOD, AND REPRODUCING METHOD - A hologram recording and reproduction method is configured such that the number of values which can be implemented per one pixel is increased from two according to a conventional method to three or more to achieve increase of the data recording capacity. While two values are conventionally represented by two different values of “0” and “1” of the amplitude, for example, phases “0” and “π” are combined with the amplitudes “0” and “1” thereby to make it possible to represent three values of “0,” “1” and “−1” (amplitude “1”×phase “π”). In particular, a two-value data train of “0” and “1” is converted into another data train of three values of “0,” “1” and “−1” in accordance with a rule for encoding determined in advance, and the amplitude “0” is allocated to pixels of the value “0”; the amplitude “1” (phase “0”) is allocated to pixels of the value “1”; and the amplitude “1” and the phase “π” are allocated to pixels of the value “−1,” to carry out recording. Increase of the data recording capacity can be achieved thereby. | 10-22-2009 |
| 20090268268 | RECORDING AND REPRODUCING DEVICE, RECORDING AND REPRODUCING METHOD, RECORDING DEVICE, RECORDING METHOD, REPRODUCING DEVICE AND REPRODUCING METHOD - A recording technique for performing data recording onto a hologram recording medium in accordance with information on phases by performing spatial light phase modulation as spatial light modulation corresponding to recording data, and a reproducing technique for reproducing recorded data by properly reading information on phases recorded as described above are suggested. A signal beam having a phase modulation pattern provided thereto corresponding to recording data and a reference beam having a specific phase modulation pattern provided thereto are applied to the hologram recording medium. Thus, recording data can be recorded onto the hologram recording medium in accordance with information on phases. In addition, at the time of reproduction, a reference beam and a DC beam having the entire phase whose phase difference with respect to a reference phase within the reference beam is π/2 are applied to the hologram recording medium. By providing a phase difference based on π/2 as described above, the phase of a reproduction beam obtained from the hologram recording medium in accordance with application of the reference beam and the phase of the DC beam can be set to be the same. Thus, the DC beam can be added as a component of an amplitude of “1” to the reproduction beam. By reading the reproduction beam to which the DC beam is added as described above, recorded information on phases can be correctly read, and recorded data can be reproduced in accordance with the phase information. | 10-29-2009 |
| 20090303560 | Spatial Light Modulator - A spatial light modulator applied to the collinear volume holographic storage system uses a hollow phase modulator to modulate the surrounding portion of an incident light to be a reference light, and the center portion of the incident light is modulated by a strength modulator to be a signal light. Thus, the spatial light modulator can enhance the convergence of the point spread function of the system. | 12-10-2009 |
| 20100060959 | REPRODUCTION APPARATUS AND REPRODUCTION METHOD - In a reproduction apparatus, a modulation control generates reference light by performing a drive control on respective pixels in reference light areas of a spatial light modulator and a phase modulator and also generates DC light added to a reproduction image by performing a drive control in a signal light area of a spatial light modulator to apply a spatial light intensity modulation at a same modulation amount in all pixels and performing a drive control in a signal light area of the phase modulator while setting one part of phase modulation amounts as a phase modulation amount for setting a same phase as a reference phase in the reproduction image obtained from a hologram recording medium in accordance with irradiation of the reference light and setting the other part of the phase modulation amounts as a phase modulation amount different by π with respect to the one part of the phase modulation amounts. | 03-11-2010 |
| 20100060960 | REPRODUCTION DEVICE AND REPRODUCTION METHOD - A reproduction device includes a light-emitting unit that emits reference light and coherent light, which is generated so as to have uniform light intensity and uniform phase, onto a hologram recording medium on which data is recorded by an interference pattern of signal light and the reference light, and a light-attenuating unit that attenuates the light intensity of the coherent light. | 03-11-2010 |
| 20100060961 | RECORDING/PLAYBACK APPARATUS, RECORDING APPARATUS, PLAYBACK APPARATUS, RECORDING/PLAYBACK METHOD, RECORDING METHOD, AND PLAYBACK METHOD - A recording/playback apparatus includes a light-generating and intensity-modulating section for generating signal light and reference light to be shined on a hologram recording medium and a phase modulating section for performing phase modulation on the signal light and the reference light on the basis of a pixel unit by using the first to nth phase modulation levels. For the phase modulation on the reference light, all pixels corresponding to the reference light are divided and set using random phase units, each having a predetermined pixel array pattern having at least two pixels, the number of pixels corresponding to each of the first to nth phase modulation levels in each random phase unit is common to the random phase units, and the array pattern of the pixels corresponding to the first to nth phase modulation levels is random for each random phase unit. | 03-11-2010 |
| 20100103487 | HOLOGRAPHIC STORAGE SYSTEM FOR READING A HOLOGRAM STORED ON A HOLOGRAPHIC STORAGE MEDIUM AND A METHOD CARRIED OUT THEREWITH - The invention relates to a holographic storage system for reading a hologram stored on a holographic storage medium. The system comprises: storage medium holding means arranged along an optical path of a reference beam; a spatial light modulator (SLM) arranged along said optical path for encoding a reference beam with a code pattern; a detector for detecting an image of the reconstructed hologram; and a servo control unit for determining a misalignment of said reference beam and said storage medium from the detected image and for acting upon said SLM to shift said code pattern. The invention further relates to a method of reading a hologram stored on a holographic storage medium comprising the steps of: a) encoding a reference beam with a code pattern created by a spatial light modulator (SLM); b) detecting an image of the reconstructed hologram; c) determining a misalignment of said reference beam and said storage medium from the detected image; and d) shifting said code pattern on the SLM based at least in part on said misalignment. | 04-29-2010 |
| 20100123944 | REPRODUCTION APPARATUS AND REPRODUCTION METHOD - A reproduction apparatus includes: a wavelength-tunable light source that outputs light illuminating a hologram recording medium such that a wavelength is variable; an optical system that illuminates through an objective lens the hologram recording medium with the reference light generated on the basis of light emitted from the wavelength-tunable light source and that includes a power changing section which changes a zoom power of the reference light incident on the objective lens; a temperature detecting section that detects a temperature of the hologram recording medium; and a control section that, when setting the zoom power of the reference light and the wavelength of the wavelength-tunable light source in response to a result of the temperature detected by the temperature detecting section, performs control such that the zoom power of the reference light and the wavelength of the wavelength-tunable light source satisfy a condition | 05-20-2010 |
| 20100157399 | Holographic Display - Disclosed is a holographic display including a spatial light modulator, and including a position detection and tracking system, such that a viewer's eye positions are tracked, with variable beam deflection to the viewer's eye positions being performed using a microprism array which enables controllable deflection of optical beams. | 06-24-2010 |
| 20100172002 | OPTICAL PICKUP APPARATUS, REPRODUCTION APPARATUS, AND REPRODUCTION METHOD - An optical pickup apparatus includes: a light source to irradiate light onto a hologram recording medium onto which information is recorded by interference fringes of signal light and reference light; a spatial light modulation portion to generate the reference light by performing a spatial light modulation on the light from the light source; and an optical system to irradiate the reference light onto the hologram recording medium via a relay lens system and an objective lens and guide reproduction light obtained from the hologram recording medium in accordance with the irradiation of the reference light to an image pickup device via the objective lens and the relay lens system, the optical system being provided with, in an optical path between the relay lens system and the image pickup device, an angle permselective device that selectively transmits light with an incidence angle of a predetermined angle or less. | 07-08-2010 |
| 20100182663 | LIGHT ILLUMINATING APPARATUS AND LIGHT ILLUMINATING METHOD - There is provided a light illuminating apparatus including: a light source allowing light to illuminate a hologram-recording medium having a recording layer, where information is recorded by an interference fringe of a signal light and a reference light, and a cover layer on an upper-layer side thereof; a spatial light-modulator performing spatial light-modulation on the light from the light source to generate the signal light and/or the reference light; and a light illuminating unit allowing the light, which is subject to the spatial light-modulation by the spatial light-modulator, as a recording/reproduced light to illuminate the hologram-recording medium through an objective lens, wherein a focus position of the recording/reproduced light is set so that a distance from a surface of the hologram-recording medium to the focus position of the recording/reproduced light is smaller than a distance from the surface to a lower-layer side surface of the recording layer. | 07-22-2010 |
| 20100195178 | Device for Light Modulation - In known light modulation means, complex phase and amplitude values for modulating light waves are implemented and modulated either separately by two different light modulation means or a light modulation means having two layers of double-refracting materials, leading to increased expenses for material and adjustment. A new device is disclosed that simplifies the modulation of light waves in phase and amplitude in a single light modulation means made of double-refracting material. In a device having regularly disposed, controllable light-modulated elements having a double-refracting material for complex modulation of coherent light waves, and a modulation controller controlling the force-induced alignment of the optical axes of the molecules of the double-refracting material, means are provided for independently aligning the optical axes of the molecules in the light-modulating elements in two dimensions. The alignment can take place by electrical, magnetic, or optical acting means. | 08-05-2010 |
| 20100253987 | Method and Device for Individual Holographic Drum Exposure - A method and a device produce an individualized hologram from a generated light beam. According to the method, the light beam is individually modulated in a spatial light modulator, a holographic recording material is arranged relative to a holographic master, and the individually modulated light beam is guided in such a manner that at least part of the individually modulated light beam is refracted and/or reflected on the holographic master and an interference pattern representing the individualized hologram is produced in the holographic recording material. The individually modulated light beam is displaced relative to the holographic recording material and the holographic master to scan the entire holographic master. The recording material is arranged so as to rest on a cylindrical drum or a cylindrical drum segment and the drum is rotated about a drum axis of the drum or the drum segment during scanning of the holographic master. | 10-07-2010 |
| 20110134497 | Hologram Generating Device And Hologram Printer - [Object] Provided are a hologram generating device and a hologram generating method that allows the generation of a hologram for reproducing an easily observable three-dimensional image without restrictions on object sizes. | 06-09-2011 |
| 20110216383 | HOLOGRAPHIC COLOR DISPLAY - Disclosed is a color filter with parallel, vertical color strips of the RGB base colors associated with the image separating means, the color strips repeating horizontally within the color filter in periodic fashion. The light modulator contains a sequence of two registered holograms for each base color interlaced into six pixel columns for a left observer eye and for a right observer eye, and the sequence is repeated horizontally in periodic fashion. The periods of the color filter and the hologram are arranged relative to one another with the same degree of expansion, with a color strip and at least two pixel columns with holograms of the base color of the color strip are associated with a separating element. | 09-08-2011 |
| 20110273754 | HOLOGRAPHIC MEMORY DEVICE AND REPRODUCTION/RECORDING METHOD - An optical beam with the same amplitude distribution and phase distribution as those of the signal beam used for recording is radiated to the hologram recording medium via an optical system of the signal beam prior to reproduction so that the optical beam with the amplitude and phase of the reference beam upon recording is generated through diffraction. A wavefront sensor detects the wavefront configuration of the diffraction beam and obtains preliminarily the suitable wavefront of the reference beam for reproduction. The wavefront control element preliminarily corrects the wavefront of the reference beam to an optimum wavefront. | 11-10-2011 |
| 20110273755 | DYNAMICALLY RECONFIGURABLE HOLOGRAMS - Various embodiments of the present invention relate to systems that can be used as holograms and can be electronically controlled and dynamically reconfigured to generate three-dimensional motion picture images. In one embodiment, a dynamically reconfigurable hologram ( | 11-10-2011 |
| 20120019883 | HOLOGRAPHIC DISPLAYS WITH HIGH RESOLUTION - Provided is a holographic display that realizes a high-resolution three-dimensional (3D) image as a spatial light modulation panel system having a fast response time and enabling the formation of high-density pixels is developed. The holographic display includes, a spatial light modulator using a polymer thin film or a dielectric thin film that enable the formation of high-density pixels and has a fast response time, a fine displacement panel system sequentially moving the spatial light modulator in synchronization with a hologram fringe signal, and an optical system including a coherent light source, a spatial light modulation panel system, and an optical element that are efficiently disposed. The holographic display has a feature that realizes a high-resolution 3D image in a scheme that integrates and displays an image while sequentially moving a spatial light modulator simply or overlaps a hologram fringe pattern. | 01-26-2012 |
| 20120092735 | THREE-DIMENSIONAL LIGHT MODULATION ARRANGEMENT FOR MODULATING A WAVE FIELD HAVING COMPLEX INFORMATION - The present invention relates to a three-dimensional light modulator, of which the pixels are combined to form modulation elements. Each modulation element can be coded with a preset discrete value such that three-dimensionally arranged object points can be holographically reconstructed. The light modulator according to the invention is characterized in that assigned to the pixels of the modulator are beam splitters or beam combiners which, for each modulation element, combine the light wave parts modulated by the pixels by means of refraction or diffraction on the output side to form a common light beam which exits the modulation element in a set propagation direction. | 04-19-2012 |
| 20120182591 | APPARATUS AND METHOD FOR IRRADIATING A SCATTERING MEDIUM - An apparatus includes a low-coherent light source configured to emit an electromagnetic wave; a spatial light modulator configured to modulate a wavefront of the electromagnetic wave; an interferometer including a movable mirror to set a depth of a medium to be irradiated by the electromagnetic wave and a beam splitter configured to the electromagnetic wave into a reference beam and an object beam; a detector to detect information about an interference pattern formed by the object beam coming from the medium via the beam splitter and the reference beam reflected by the movable mirror; and a controller configured to control the spatial light modulator, based on the information, to form a modulated wavefront for irradiating the medium. | 07-19-2012 |
| 20120250121 | PHASE ADDRESSED HOLOGRAPHIC ASSOCIATIVE MEMORY - The present invention provides a holographic storage apparatus comprising a polarizing beam splitter configured to split an incoming beam into an object beam and a reference beam; a first spatial light modulator configured to modulate the object beam with an array of data; a second spatial light modulator configured to phase modulate the reference beam with an orthogonal phase function; a holographic medium configured to record an interference pattern between the modulated object beam and the modulated reference beam; a first image sensor configured to read an image of the modulated object beam; and a second image sensor configured to read an image of the modulated reference beam. | 10-04-2012 |
| 20130120814 | HOLOGRAM REPLICATING METHOD AND HOLOGRAM REPLICATING APPARATUS - A hologram master having a hologram image recorded thereon is brought into intimate contact with a surface of a hologram recording medium containing a photosensitive material directly or via a refractive index adjuster. The hologram image is made to have continuous parallax in at least a first direction with a movement of an eyepoint along the first direction with respect to a normal line when the hologram master is illuminated at a predetermined angle. First laser light is applied onto the hologram master and the hologram recording medium via a diffusion plate configured to diffuse incident light in a second direction. Second laser light is applied onto the hologram recording medium via the hologram master simultaneously with the first laser light. The hologram image recorded on the hologram master and first additional information are recorded on the hologram recording medium. | 05-16-2013 |
| 20130148180 | PHOTOREFRACTIVE COMPOSITE, SPATIAL LIGHT MODULATOR, AND HOLOGRAM DISPLAY DEVICE USING THE SAME - A photorefractive composite, a spatial light modulator and a hologram display device using the same include at least one carborane compound expressed as the following Chemical Formulae 1A through 1C: | 06-13-2013 |
| 20130148181 | PHOTOREFRACTIVE COMPOSITE, SPATIAL LIGHT MODULATOR, AND HOLOGRAM DISPLAY DEVICE USING THE SAME - A photorefractive composite, a spatial light modulator and a hologram display device using the same include at least one carborane compound expressed as the following Chemical Formulae 1A through 1C: | 06-13-2013 |
| 20130208328 | HOLOGRAPHIC DISPLAY APPARATUS CAPABLE OF STEERING VIEW WINDOW - Holographic display apparatuses are provided. The holographic display apparatus may include a light source module generating coherent light, at least two input optical systems converging the light generated from the light source module on at least two converging points, an output optical system mixing the lights provided from the at least two input optical systems to provide a hologram image, and a spatial light modulating module modulating the light. | 08-15-2013 |
| 20130215484 | HOLOGRAM DISPLAY MODULE AND STEREOSCOPIC DISPLAY DEVICE - A hologram display module | 08-22-2013 |
| 20130321888 | COMPLEX SPATIAL LIGHT MODULATOR AND HOLOGRAPHIC 3D IMAGE DISPLAY DEVICE HAVING THE SAME - A complex spatial light modulator includes a polarization-phase modulator for separating an incident beam into a first beam having a first polarization and a first phase, and a second beam having a second polarization and a second phase, and for outputting the first beam and the second beam; and a beam synthesizer including a prism structure formed of an optical anisotropic material having a first refractive index with respect to the first beam having the first polarization and having a second refractive index, different form the first refractive index, with respect to the second beam having the second polarization, where the beam synthesizer combines the first beam and the second beam. | 12-05-2013 |
| 20140204437 | DYNAMIC APERTURE HOLOGRAPHIC MULTIPLEXING - Systems and methods for dynamic aperture holographic multiplexing are disclosed. One example process may include recording a set of holograms in a recording medium by varying both the reference beam angular aperture and the signal beam angular aperture. The angular aperture of the signal beam may be dynamically changed such that the closest edge of each signal beam angular aperture is selected to be a threshold angle different than the angular aperture of the reference beam used to record it. In some examples, the dynamic aperture holographic multiplexing process may include dynamic aperture equalization to reduce cross-talk, to improve error correction parity distribution for improved recovery transfer rate, to provide multiple locus aperture sharing for increased recording density, and to provide polarization multiplexed shared aperture multiplexing for increased transfer rate in both recording and recovery. | 07-24-2014 |
| 20140320942 | APPARATUS FOR PRODUCING A HOLOGRAM - An apparatus for producing a hologram includes a collimation lens configured to receive incoherent light emitted from an object; a spatial light modulator (SLM) that includes at least one diffractive lens which is configured to receive the incoherent light from the collimation lens and split the incoherent light into two beams that interfere with each other; and a camera configured to record the interference pattern of the two beams to create a hologram, wherein a ratio between a distance from the SLM to the camera and a focal length of the diffractive lens is greater than 1. | 10-30-2014 |
| 20140347714 | APPARATUS AND METHOD FOR GENERATING WIDE-ANGLE COHERENT LIGHT AND DISPLAY APPARATUS USING WIDE-ANGLE COHERENT LIGHT - A method and apparatus for generating coherent light, and a display apparatus using coherent light are provided. A wide-angle coherent light generation apparatus may focus parallel light onto a focal point, and may generate coherent light at a wide angle, using an optical device. | 11-27-2014 |
| 20150077820 | IMAGE PROJECTION APPARATUS - An aperture forming member is provided on a light path from a laser light source to a collimator lens, and a plurality of apertures are formed by a plurality of wall bodies of the aperture forming member. The distances between the apertures and the outer surface of an effective beam decrease in the order of L1, L2, and L3. By providing the plurality of apertures, entrance of stray light into a phase conversion array can be prevented. | 03-19-2015 |
| 20160011564 | BEAM SPLITTING DEVICE | 01-14-2016 |
| 20160077339 | NEAR-EYE DEVICE - A near-eye device includes a spatial light modulator and a beam combiner. The spatial light modulator includes an array of phase modulating elements arranged to apply a phase delay distribution to incident light. The beam combiner includes a first optical input arranged to receive spatially modulated light from the spatial light modulator and a second optical input having a field of view of the real world. | 03-17-2016 |
| 20160147003 | BACKLIGHT UNIT FOR HOLOGRAPHIC DISPLAY APPARATUS AND HOLOGRAPHIC DISPLAY APPARATUS INCLUDING THE SAME - A backlight unit (BLU), for a binocular holographic display apparatus, and the binocular holographic display apparatus including the BLU are provided. The BLU includes: a light source unit that emits coherent illumination light; and a light guide plate that is transparent and includes a light incidence surface onto which the coherent illumination light emitted by the light source unit is incident and a light emission surface through which the illumination light is output. The light source unit includes a beam deflector that adjusts an incidence angle of the illumination light incident onto the light guide plate. | 05-26-2016 |
| 20160170372 | SCALABLE AND TILEABLE HOLOGRAPHIC DISPLAYS | 06-16-2016 |
