Patent application number | Description | Published |
20080253263 | Optical head device and diffractive element, optical information apparatus, computer, disc player, car navigation system, optical disc recorder, and vehicle - In an optical head device responding to optical disc of different track pitches, an effect of both obtaining the tracking error signal by the optimum DPP method using a single diffractive element and suppressing the lowering amount in the amplitude of the tracking error signal in a state the object lens is moved by track following is obtained. In the optical head device, the grating phase of left and right regions of a sub-beam generating diffractive element differ from each other by 180 degrees. A central region of the sub-beam generating diffractive element has a grating pattern different from the left and right regions, and is divided into a plurality of regions to form different gratings different from each other. | 10-16-2008 |
20090010137 | OPTICAL DISC DRIVE AND OPTICAL INFORMATION SYSTEM - The type of a disc is determined by detecting focus error signals and the amount of returned light while emitting light with a wavelength such as infrared light which maximizes the focal length and moving an objective lens in the direction of an optical axis. If the S shape and AS immediately after the surface are greater than those at the surface, the optical disc is determined to be an optical disc with a largest capacity. It is determined whether or not there is a reflective layer at a depth equal to or less than 0.1 mm. If there is no reflective layer thereat, it is determined whether or not there is a reflective layer at a depth of 0.6 mm. If there is a reflective layer thereat, the type of the reflective layer is determined based on TE and RF signals with blue light. If the blue light is not adaptable to the layer, red light is emitted, and replay of the recording layer at a depth of 0.6 mm is performed. | 01-08-2009 |
20090028035 | OPTICAL HEAD DEVICE AND OPTICAL INFORMATION PROCESSING DEVICE - An optical head device according to the present invention includes a splitting section for splitting a light beam having been reflected from an optical storage medium. The splitting section includes: a first main region transmitting a first interfering portion; a second interfering portion transmitting a second main region; and first and second sub-regions through which the first interfering portion is transmitted with a lower rate than in the first main region and through which the second interfering portion is transmitted with a lower rate than in the second main region. The splitting section splits the reflected light beam into: a first main light beam transmitted through the first main region; a second main light beam transmitted through the second main region; a first sub-light beam transmitted through the first sub-region; and a second sub-light beam transmitted through the second sub-region. The splitting section further includes a swapping section for swapping a portion of the first sub-light beam with a portion of the second sub-light beam. | 01-29-2009 |
20090034402 | Optical Head Device, Optical Information Device, Optical Disc Player, Car Navigation System, Optical Disc Recorder, and Optical Disc Server - In an optical head device including a light source for emitting a light of a predetermined wavelength; a collimator lens for converting a divergence degree of the light; a folding mirror for folding a direction of the light emitted from the light source; an objective lens for converging the light on a recording surface of an optical disc; a photodetector for receiving the light reflected at the recording surface of the optical disc, and converting to an electric signal; and an optical path adjustment unit for guiding the light emitted from the light source to the collimator lens and guiding the light reflected at the recording surface of the optical disc to the photodetector; a wavelength plate for polarizing the light reflected by the folding mirror is arranged on an actuator base between the folding mirror and the objective lens. | 02-05-2009 |
20090034403 | OPTICAL PICKUP DEVICE AND OPTICAL DISC DEVICE - An optical pickup device which can more improve heat radiation efficiency and an optical disk apparatus including the optical pickup device are provided. The optical pickup device having a base ( | 02-05-2009 |
20090040909 | Optical head device and optical information device - An optical head device is provided with a light source | 02-12-2009 |
20090080298 | OPTICAL HEAD, OPTICAL HEAD MANUFACTURING METHOD AND OPTICAL DISC DEVICE - It is aimed to provide an optical head, an optical head manufacturing method and an optical disc device capable of correcting coma aberration generated due to different positions of emission points of a plurality of laser lights having different wavelengths. | 03-26-2009 |
20090086330 | OPTICAL PICKUP, OPTICAL DISC DRIVE DEVICE, AND OPTICAL INFORMATION DEVICE - A small optical pickup of wide spherical aberration correction range is provided. The optical pickup includes a rising mirror for deflecting a light beam at substantially right angle and guiding to an entrance surface of the objective lens; a spherical aberration correction lens having one surface formed to a larger curvature than the other surface; a lens holder for holding the spherical aberration correction lens so that the surface of large curvature partially projects out towards the rising mirror side; a guide member extending in an optical axis direction of the spherical aberration correction lens sand having an end arranged to the side of a reflecting surface of the rising mirror; and a slidable part slidable along the guide member; wherein the projecting portion of the slidable part is configured to be fitted within the side surface of the reflecting surface of the rising mirror, and the projecting portion from the lens holder of the spherical aberration correction lens overlaps the reflecting surface of the rising mirror when the spherical aberration correction lens approaches the rising mirror the most. | 04-02-2009 |
20090138901 | OPTICAL PICKUP, OPTICAL ELEMENT, OPTICAL INFORMATION DEVICE, COMPUTER, OPTICAL INFORMATION MEDIUM PLAYER, CAR NAVIGATION SYSTEM, OPTICAL INFORMATION MEDIUM RECORDER AND OPTICAL DISK SERVER - An optical pickup includes: a laser light source which outputs an divergent beam having an elliptical far-field pattern; a beam shaping element having at least one cylindrical plane and which shapes the divergent beam outputted from the laser light source into an divergent beam having a prescribed shape in which at least the length in the major axis direction of the elliptical shape is shortened; a light collecting portion having a beam splitter which perpendicularly collects the divergent beam that is outputted from the beam shaping element and which has a prescribed shape on the recording surface of an optical disk, and a mirror or the like; and a light detecting portion The optical axis of the divergent beam is rotated so that the direction in which the major axis of the divergent beam having a prescribed shape is shortened conforms to the radial direction of an optical information recording medium. | 05-28-2009 |
20090141614 | OPTICAL PICKUP - An adhesive positions a beam shaping element in such a manner as to satisfy the following relational expressions (1) and (2): | 06-04-2009 |
20090147659 | OBJECTIVE LENS UNIT, OPTICAL PICKUP, AND OPTICAL INFORMATION DEVICE - An objective lens unit according to the present invention includes a first objective lens | 06-11-2009 |
20090185473 | OBJECTIVE LENS AND OPTICAL PICKUP DEVICE - In order that thickness reduction, weight reduction, and mass productivity improvement should be achieved in an objective lens even in the case where NA is high, an objective lens according to the present invention is a bi-convex single lens having at least one aspheric surface, and satisfies conditions: (1) 3.507-23-2009 | |
20090245075 | OPTICAL HEAD DEVICE, OPTICAL INFORMATION DEVICE, COMPUTER, DISC PLAYER, CAR NAVIGATION SYSTEM, OPTICAL DISC RECORDER, AND VEHICLE - An optical head device compatible to different types of optical discs and capable of guaranteeing a sufficiently wide dynamic range for a low density optical disc, and the like are provided. | 10-01-2009 |
20090257340 | OPTICAL HEAD - To provide an optical head to produce good servo and read signals by reducing the influence of interference by light reflected from a non-read layer of a multilayer optical disc. | 10-15-2009 |
20090262629 | OPTICAL HEAD, OPTICAL DISC DEVICE AND INFORMATION RECORDING AND/OR REPRODUCING DEVICE - An optical head is provided with a light source for emitting a first laser beam having a first wavelength shorter than 430 nm, a two-wavelength light source for emitting a second laser beam having a second wavelength equal to or longer than 430 nm, a flat beam splitter in the form of a single plate for reflecting the first laser beam emitted from the light source, a wedge prism in the form of a single plate for reflecting the first laser beam reflected by the flat beam splitter and transmitting the second laser beam emitted from the two-wavelength light source, and an objective lens for focusing the first laser beam reflected by the wedge prism on an information recording surface of a BD. The light source is arranged such that the optical axis of the first laser beam emitted from the light source is inclined with respect to that of the second laser beam emitted from the two-wavelength light source. By this construction, the miniaturization of the optical head can be realized. | 10-22-2009 |
20090310465 | OPTICAL HEAD AND OPTICAL INFORMATION DEVICE - An optical head according to the present invention includes: a first light source that emits light with a first wavelength; a beam splitter that splits the light emitted from the first light source into a first light beam traveling in a first direction and a second light beam traveling in a second direction different from the first direction; a first collimator lens for changing degrees of divergence of the first light beam; a first mirror that changes the traveling directions of the first light beam, of which the degrees of divergence have been changed; a first objective lens for converging the first light beam, which has had its traveling directions changed, toward a storage layer of a first optical disk; a mover that holds the first objective lens; a first photodetector that receives the first light beam reflected from the storage layer of the first optical disk and converts it into an electrical signal; a condenser lens for condensing the second light beam; and a second photodetector that receives the second light beam condensed by the condenser lens and converts it into an electrical signal. | 12-17-2009 |
20100034073 | OPTICAL HEAD DEVICE AND RECORDING/REPRODUCTION DEVICE - An optical head device includes a first light source and a second light source which respectively emits a first light beam and a second light beam, a luminous flux separating section which selectively separates the first and second light beams for which the same optical path is used, to first and second optical paths, respectively, a first objective lens for converging the first light beam that has been separated to the first optical path on the first optical information recording medium, a second objective lens made of resin for converging the second light beam separated to the second optical path on the second optical information recording medium, and a first filtering section formed on a beam exit face of the second objective lens, for reducing the transmittance of the first light beam to be lower than transmittance of the second light beam. | 02-11-2010 |
20100074067 | OPTICAL DISK DRIVING APPARATUS, OPTICAL DISK DRIVING SYSTEM, VEHICLE EQUIPPED WITH OPTICAL DISK DRIVING SYSTEM, METHOD OF CORRECTING SPHERICAL ABERRATION IN OPTICAL DISK DRIVING APPARATUS, PROGRAM AND RECORDING MEDIUM - An optical disk driving apparatus includes an optical head device having a laser light source, a converging optical system converging a light beam emitted by the laser light source onto an optical disk, a photo detector receiving reflected light reflected by the optical disk, and an aberration correcting optical system controlling aberration of the converging optical system; a motor rotating the optical disk; and a control section receiving a signal from the photo detector, wherein the converging optical system has an objective lens formed using resin as a main material, the aberration correcting optical system has a spherical aberration correcting element correcting spherical aberration, and the control section evaluates quality of a reproduction signal for information in the optical disk by using the reflected light received by the photo detector, and utilizes a result of the evaluation to perform closed loop control on the spherical aberration correcting element. | 03-25-2010 |
20100103803 | OPTICAL HEAD, OPTICAL DISC DEVICE AND INFORMATION PROCESSING DEVICE - It is aimed to provide an optical head, an optical disc device and an information processing device capable of suppressing the amount of third-order astigmatism created upon recording or reproducing information on or from a multi-layer optical disc including at least three information recording surfaces. | 04-29-2010 |
20100118685 | OPTICAL RECORDING MEDIUM, MANUFACTURING METHOD FOR OPTICAL RECORDING MEDIUM, INFORMATION RECORDING/REPRODUCING METHOD AND INFORMATION RECORDING/REPRODUCING DEVICE - An optical recording medium is capable of preventing a back focus at the face thereof and reducing the interference between beams reflected by each recording surface, thereby improving the quality of a servo signal and a reproductive signal. In a disk having (N-1) layers if N is a natural number (more than three), if a cover-layer thickness and intermediate-layer thicknesses are d | 05-13-2010 |
20100128590 | Optical information medium measurement method, optical information medium, recording apparatus, and reproducing apparatus - An optical information medium measurement method of the present invention, for measuring a degree of modulation in an optical information medium of a multilayered structure having a plurality of information layers, includes a first step of measuring the modulation degree of each layer of the optical information medium, by use of a measurement optical system, a second step of obtaining a thickness between layers of the optical information medium, a third step of obtaining a reflectance of each layer of the optical information medium, and a fourth step of converting the modulation degree of each layer, the modulation degree being measured in the first step, into a modulation degree at a reference optical system differing from the measurement optical system, based on a value indicative of the thickness between layers, the thickness being obtained in the second step, and a value indicative of the reflectance of each layer, the reflectance being obtained in the third step. | 05-27-2010 |
20100142348 | OPTICAL INFORMATION MEDIUM MEASUREMENT METHOD, OPTICAL INFORMATION MEDIUM, RECORDING APPARATUS AND REPRODUCING APPARATUS - An optical information medium measurement method of the present invention, for measuring a degree of modulation in an optical information medium of a multilayered structure having a plurality of information layers, includes a first step of measuring the modulation degree of each layer of the optical information medium, by use of a measurement optical system, a second step of obtaining a thickness between layers of the optical information medium, a third step of obtaining a reflectance of each layer of the optical information medium, and a fourth step of converting the modulation degree of each layer, the modulation degree being measured in the first step, into a modulation degree at a reference optical system differing from the measurement optical system, based on a value indicative of the thickness between layers, the thickness being obtained in the second step, and a value indicative of the reflectance of each layer, the reflectance being obtained in the third step. | 06-10-2010 |
20100142356 | OPTICAL ELEMENT, OPTICAL HEAD, OPTICAL INFORMATION RECORDING AND REPRODUCTION APPARATUS, COMPUTER, IMAGE RECORDING DEVICE, IMAGE REPRODUCTION DEVICE, SERVER AND CAR NAVIGATION SYSTEM - The present invention provides a first light source ( | 06-10-2010 |
20100142357 | OBJECTIVE LENS SYSTEM AND OPTICAL PICKUP DEVICE - Provided are an optical pickup device which is compatible with a plurality of disc standards, and can stably monitor the outputs from light sources, and an objective lens system used in the optical pickup device. An optical pickup device | 06-10-2010 |
20100142358 | OPTICAL HEAD, OPTICAL DISC DEVICE, COMPUTER, OPTICAL DISC PLAYER AND OPTICAL DISC RECORDER - An optical head ( | 06-10-2010 |
20100143637 | Optical recording medium, and method for producing optical recording medium - An object of the invention is to provide an optical recording medium and a method for producing an optical recording medium that enable to improve the quality of a servo signal and a reproduction signal. The optical recording medium satisfies: t | 06-10-2010 |
20100149932 | OPTICAL RECORDING MEDIUM, AND OPTICAL INFORMATION DEVICE - An object of the invention is to provide an optical recording medium and an optical information device that enable to improve the quality of a servo signal and a reproduction signal. In the case where shape-wise thicknesses tr | 06-17-2010 |
20100165823 | OPTICAL PICKUP DEVICE AND INFORMATION PROCESSOR - In an optical beam transmissive adjusting mechanism ( | 07-01-2010 |
20100177621 | OPTICAL PICKUP DEVICE AND COLLIMATE LENS - It is an object of the present invention to provide an optical pickup device being capable of correcting coma aberration induced in a light-condensing optical system including an objective lens for an optical disc and having a reduced size and a reduced thickness in comparison with the conventional art. The present invention includes a first coma-aberration correction actuator ( | 07-15-2010 |
20100208563 | INFORMATION RECORDING MEDIUM, REPRODUCING APPARATUS AND REPRODUCING METHOD - An information recording medium according to the present invention includes at least three information recording layers. If the readout power of a laser beam in reading information from an information recording layer L(n) is identified by Pw(n), and if the readout power of the laser beam in reading information from an information recording layer L(n+a) is identified by Pw(n+a), then a base thickness between the information recording layers is determined so that the intensity of the light when the information recording layer L(n+a) is irradiated with a laser beam having the readout power Pw(n) becomes equal to or lower than that of the light when the information recording layer L(n+a) is irradiated with a laser beam having the readout power Pw(n+a). | 08-19-2010 |
20100208564 | OPTICAL PICKUP, OPTICAL INFORMATION DEVICE, COMPUTER, OPTICAL DISK PLAYER, CAR NAVIGATION SYSTEM, OPTICAL DISK RECORDER, AND OPTICAL DISK SERVER - To provide an optical pickup and an optical information device, capable of obtaining excellent signal characteristics for an optical disk on and/or from which recording and/or reproducing are performed using a laser. The optical pickup includes an optical detector, a support holder for holding the optical detector, and an optical base for fixing the support holder. The support holder has at least two notches at its both ends, the optical base has convex portions corresponding to the notches of the support holder, the optical base and the support holder are fixed by photo-curable adhesives for bonding the convex portions and the support holder to each other, and the shortest distance between the side faces of the convex portions, which do not face each other, is equal to or less than the width of the support holder in the direction of right and left ends. | 08-19-2010 |
20100246347 | OPTICAL PICKUP DEVICE, OPTICAL INFORMATION DEVICE, COMPUTER, OPTICAL DISK PLAYER, CAR NAVIGATION SYSTEM, OPTICAL DISK RECORDER, AND OPTICAL DISK SERVER - An object of the invention is to prevent damage or performance degradation of an optical component constituting a second optical system, and suppress degradation of the recording/reproducing performance of an optical pickup device. A first laser light source 1 emits a first light beam having a first wavelength. A first optical system | 09-30-2010 |
20100260488 | OPTICAL DISC DEVICE, VIDEO REPRODUCING APPARATUS, SERVER, CAR NAVIGATION SYSTEM USING THE OPTICAL DISC DEVICE, INTEGRATED CIRCUIT AND RECORDING/REPRODUCING METHOD - An optical disc device is provided with an optical head ( | 10-14-2010 |
20100271925 | OPTICAL HEAD, OPTICAL ELEMENT WITH DIFFRACTION GRATING, OPTICAL DISC DEVICE AND INFORMATION PROCESSING DEVICE - An optical head ( | 10-28-2010 |
20110002217 | OBJECTIVE LENS AND OPTICAL PICKUP DEVICE - In order that thickness reduction, weight reduction, and mass productivity improvement should be achieved in an objective lens even in the case where NA is high, an objective lens according to the present invention is a bi-convex single lens having at least one aspheric surface, and satisfies conditions: (1) 3.501-06-2011 | |
20110032805 | INFORMATION RECORDING MEDIUM, REPRODUCING DEVICE AND REPRODUCING METHOD - An information recording medium according to the present invention includes at least three information recording layers. If the readout power of a laser beam in reading information from an information recording layer L(n) is identified by Pw(n), and if the readout power of the laser beam in reading information from an information recording layer L(n+a) is identified by Pw(n+a), then a base thickness between the information recording layers is determined so that the intensity of the light when the information recording layer L(n+a) is irradiated with a laser beam having the readout power Pw(n) becomes equal to or lower than that of the light when the information recording layer L(n+a) is irradiated with a laser beam having the readout power Pw(n+a). | 02-10-2011 |
20110051585 | MANUFACTURING METHOD FOR OPTICAL RECORDING MEDIUM, OPTICAL RECORDING MEDIUM, OPTICAL INFORMATION DEVICE, AND INFORMATION REPRODUCING METHOD - An object of the invention is to improve the quality of a servo signal and a reproduction signal. Shape-wise thicknesses tr | 03-03-2011 |
20110069601 | OPTICAL ELEMENT, OPTICAL HEAD, OPTICAL INFORMATION DEVICE AND METHOD OF CONTROLLING OPTICAL HEAD - An optical head includes a laser light source of emitting laser, an objective lens which focuses the laser emitted from the laser light source on an optical recording medium and an optical element placed between the light source and the optical recording medium, of which the transmittance varies depending on a voltage applied. The voltage applied to the optical element is switched so that the optical element has a lower transmittance upon reproducing a signal on the optical recording medium than upon recording a signal on the optical recording medium, at times when recording a signal on the optical recording medium and when reproducing a signal on the optical recording medium. | 03-24-2011 |
20110075534 | OPTICAL RECORDING MEDIUM, AND OPTICAL INFORMATION DEVICE - An object of the invention is to provide an optical recording medium and an optical information device that enable to improve the quality of a servo signal and a reproduction signal. In the case where shape-wise thicknesses tr | 03-31-2011 |
20110076436 | OPTICAL RECORDING MEDIUM AND METHOD FOR MANUFACTURING THE SAME - An optical recording medium having three or more information recording layers reduces crosstalk caused by multi-reflected beams and improves signal quality. In the optical recording medium having three or more information recording layers, the refractive index of a plurality of intermediate layers disposed between adjacent information recording layers is greater than the refractive index of a cover layer disposed between a light incident surface and an information recording layer being the closest from the light incident surface. | 03-31-2011 |
20110078711 | OPTICAL RECORDING MEDIUM, AND OPTICAL INFORMATION DEVICE - An object of the invention is to provide an optical recording medium and an optical information device that enable to improve the quality of a servo signal and a reproduction signal. In the case where shape-wise thicknesses tr | 03-31-2011 |
20110096645 | OPTICAL HEAD FOR OPTICAL RECORDER/REPRODUCER - An optical head for recording or reproducing a signal on or from an optical recording medium including a light source, an objective lens for condensing light emitted from the light source to the optical recording medium, and a light-separating device arranged between the light source and the objective lens in order to separate the light reflected from the optical recording medium from the light emitted from the light source. The light-separating device includes a first glass, a multilayer film formed on the first glass, and an adhesive layer arranged on the multilayer film in order to bond a second glass onto the multilayer film. The majority of the light emitted from the light source enters into the light-separating device through the first glass and is reflected by the multilayer film. | 04-28-2011 |
20110122744 | OBJECTIVE LENS UNIT, OPTICAL PICKUP, AND OPTICAL INFORMATION APPARATUS - An objective lens unit according to the present invention includes a first objective lens | 05-26-2011 |
20110122745 | OBJECTIVE LENS UNIT, OPTICAL PICKUP, AND OPTICAL INFORMATION APPARATUS - An objective lens unit according to the present invention includes a first objective lens | 05-26-2011 |
20110134737 | COMPLEX OBJECTIVE LENS, OPTICAL HEAD, OPTICAL INFORMATION APPARATUS, COMPUTER, OPTICAL DISK PLAYER, CAR NAVIGATION SYSTEM, OPTICAL DISK RECORDER, AND OPTICAL DISK SERVER - A complex objective lens composed of a hologram and an objective lens, capable of realizing stable and high-precision compatible reproducing/recording of a BD with a base thickness of about 0.1 mm for a blue light beam (wavelength λ1) and a DVD with a base thickness of about 0.6 mm for a red light beam (wavelength λ2). In an inner circumferential portion of the hologram, a grating is formed, which has a cross-sectional shape including as one period a step of heights in the order of 0 time, twice, once, and three times a unit level difference that gives a difference in optical path of about one wavelength with respect to a blue light beam, from an outer peripheral side to an optical axis side. The hologram transmits a blue light beam as 0th-order diffracted light without diffracting it, and disperses a red light beam passing through an inner circumferential portion as +1st-order diffracted light and allows it to be condensed by an objective lens. Because of this, the focal length of the red light beam becomes longer than that of the blue light beam, whereby a working distance is enlarged. | 06-09-2011 |
20110170389 | OPTICAL INFORMATION MEDIUM MEASUREMENT METHOD, OPTICAL INFORMATION METHOD, OPTICAL INFORMATION MEDIUM, RECORDING APPARATUS, AND REPRODUCING APPARATUS - An optical information medium measurement method of the present invention, for measuring a degree of modulation in an optical information medium of a multilayered structure having a plurality of information layers, includes a first step of measuring the modulation degree of each layer of the optical information medium, by use of a measurement optical system, a second step of obtaining a thickness between layers of the optical information medium, a third step of obtaining a reflectance of each layer of the optical information medium, and a fourth step of converting the modulation degree of each layer, the modulation degree being measured in the first step, into a modulation degree at a reference optical system differing from the measurement optical system, based on a value indicative of the thickness between layers, the thickness being obtained in the second step, and a value indicative of the reflectance of each layer, the reflectance being obtained in the third step. | 07-14-2011 |
20110170394 | MANUFACTURING METHOD FOR OPTICAL RECORDING MEDIUM, OPTICAL RECORDING MEDIUM, OPTICAL INFORMATION DEVICE, AND INFORMATION REPRODUCING METHOD - An object of the invention is to improve the quality of a servo signal and a reproduction signal. Shape-wise thicknesses tr | 07-14-2011 |
20110170398 | OPTICAL HEAD DEVICE, OPTICAL INFORMATION DEVICE, COMPUTER, DISC PLAYER, CAR NAVIGATION SYSTEM, OPTICAL DISC RECORDER, AND VEHICLE - An optical head device compatible to different types of optical discs and capable of guaranteeing a sufficiently wide dynamic range for a low density optical disc, and the like are provided. | 07-14-2011 |
20110235492 | OPTICAL HEAD, DIFFRACTION DEVICE, OBJECTIVE LENS, AND OPTICAL DISC APPARATUS - An object of the present invention is to reduce the influence of a stray light incident on a light receiving device by reflection of an unnecessary diffraction light not contributing to write or read on a disc surface at write or read of an optical disc having a large surface reflectivity with respect to an information recording surface. A position in which a diffraction light with an n-order in an advancing path and the n-order in a returning path, reflected on the information recording surface of a first information recording medium, is focused by a condensing lens is different from a position in which a diffraction light different from the n-order diffraction light in at least one of the advancing path and the returning path, reflected on a surface of the first information recording medium, is focused by the condensing lens. | 09-29-2011 |
20110242950 | COMPOSITE OBJECTIVE LENS, DIFFRACTION ELEMENT, OPTICAL HEAD DEVICE, OPTICAL INFORMATION DEVICE, OBJECTIVE LENS DRIVING METHOD AND CONTROL DEVICE - In an optical head device which performs recording or reading of data in/from a high-density optical disc using an objective lens with a large NA, a saw-tooth shape diffraction element is used for also performing recording or reading of data in/from a conventional optical disc, such as DVD, CD, or the like. A step difference that produces an optical path length for blue light which is equal to or longer than the wavelength of the blue light and optical path lengths for red and infrared light which are shorter than the wavelengths of the red and infrared light is utilized so as to exert an inverse action on the blue light to those exerted on the red and infrared light. The effect of increasing the working distances for CD and DVD enables multiple compatibility. The above optical element is integrally combined with the objective lens to perform a tracking servo following operation. | 10-06-2011 |
20110267934 | OPTICAL PICKUP, OPTICAL INFORMATION DEVICE, COMPUTER, OPTICAL DISK PLAYER, CAR NAVIGATION SYSTEM, OPTICAL DISK RECORDER, AND OPTICAL DISK SERVER - To provide an optical pickup and an optical information device, capable of obtaining excellent signal characteristics for an optical disk on and/or from which recording and/or reproducing are performed using a laser. The optical pickup includes an optical detector, a support holder for holding the optical detector, and an optical base for fixing the support holder. The support holder has at least two notches at its both ends, the optical base has convex portions corresponding to the notches of the support holder, the optical base and the support holder are fixed by photo-curable adhesives for bonding the convex portions and the support holder to each other, and the shortest distance between the side faces of the convex portions, which do not face each other, is equal to or less than the width of the support holder in the direction of right and left ends. | 11-03-2011 |
20110305131 | INFORMATION RECORDING MEDIUM, INFORMATION SUPPLY SYSTEM, AND OPTICAL INFORMATION DEVICE - An optical disk compliant with both a conventional optical disk such as a BD, HD DVD, and the like and a next-generation high-density optical disk according to a near-field light recording system and the like is provided. | 12-15-2011 |
20120011523 | OPTICAL RECORDING MEDIUM, MANUFACTURING METHOD FOR OPTICAL RECORDING MEDIUM, INFORMATION RECORDING/REPRODUCING METHOD AND INFORMATION RECORDING/REPRODUCING DEVICE - An optical recording medium (disk) capable of preventing a back focus at a face thereof and reducing the interference between beams reflected by each recording surface, thereby improving a quality of a servo signal and a reproductive signal. In a disk having (N−1) layers, if N is a natural number (more than three), and if a cover-layer thickness and intermediate-layer thicknesses are d1, d2, . . . dN, then a difference of 1 μm or above is set between the sum of di to dj and the sum of dk to dm for arbitrary natural numbers i, j, k, m (i≦j≦k≦m≦N). If refractive indexes are different from a standard value or different for each layer, then the thickness of each layer is converted based on a spread width of light according to the thickness. | 01-12-2012 |
20120011524 | OPTICAL RECORDING MEDIUM, AND OPTICAL INFORMATION DEVICE - An optical recording medium and an optical information device that improve the quality of a servo signal and a reproduction signal. In the optical recording medium, when shape-wise thicknesses tr | 01-12-2012 |
20120023514 | COMPOUND OBJECTIVE LENS, OPTICAL HEAD DEVICE, OPTICAL INFORMATION DEVICE, AND INFORMATION PROCESSING DEVICE - A compound objective lens, an optical head device, an optical information device, and an information processing device that can inhibit the occurrence of aberration even when a light beam source wavelength shifts from the designed value. A diffraction structure having a sawtooth or stepwise cross section is formed in the region (R | 01-26-2012 |
20120075982 | Objective Lens Element and Optical Pickup Device - An optical pickup device is provided which is compatible with at least two types of optical disc standards having different NAs and which controls an effective NA when a light beam for an optical disc standard having a relatively small NA is converged, thereby forming a desired spot. An inner part | 03-29-2012 |
20120075983 | INFORMATION RECORDING MEDIUM, INFORMATION SUPPLY SYSTEM, AND OPTICAL INFORMATION DEVICE - An information recording medium includes a first information recording layer and a second information recording layer. The first information recording layer is formed at a laser beam entrance surface, and is configured so that information can be recorded thereupon and/or reproduced therefrom using a first objective lens having a numerical aperture NA | 03-29-2012 |
20120113787 | MANUFACTURING METHOD FOR OPTICAL RECORDING MEDIUM, OPTICAL RECORDING MEDIUM, OPTICAL INFORMATION DEVICE, AND INFORMATION REPRODUCING METHOD - Shape-wise thicknesses tr | 05-10-2012 |
20120134256 | OPTICAL HEAD, OPTICAL ELEMENT WITH DIFFRACTION GRATING, OPTICAL DISC DEVICE AND INFORMATION PROCESSING DEVICE - An optical head includes a blue-violet laser light source for emitting a blue-violet laser beam, a mirror with a diffraction grating for transmitting and reflecting the blue-violet laser beam at a predetermined ratio, and a front monitor sensor for receiving transmitted light or reflected light from the mirror with a diffraction grating and creating an APC signal for controlling an output of the blue-violet laser light source. The mirror with a diffraction grating includes a first surface which the blue-violet laser beam enters, and a second surface facing the first surface. The first surface and the second surface are mutually parallel. A reflecting coat for transmitting and reflecting the blue-violet laser beam at a predetermined ratio is formed on the first surface, and a diffraction grating is formed on the second surface. | 05-31-2012 |
20120151508 | OPTICAL HEAD DEVICE, OPTICAL INFORMATION DEVICE, AND INFORMATION PROCESSING DEVICE - When information is recorded or reproduced on or from an optical information medium having three or more recording layers using blue light, interference by another layer light is reduced and, when information is reproduced from an optical information medium using red light, an S/N ratio is held excellently high. | 06-14-2012 |
20120163157 | Optical Element and Optical Pickup Device - An optical element which can be shared by three wavelengths for BD, DVD, and CD and which is easily manufactured is provided. An objective lens system includes an optical element | 06-28-2012 |
20120170122 | Objective Lens Element - An objective lens element which has excellent compatibility with optical discs having different base material thicknesses is provided. An objective lens element | 07-05-2012 |
20120170431 | OPTICAL HEAD DEVICE, OPTICAL INFORMATION DEVICE AND INFORMATION PROCESSING DEVICE - An optical head device includes a light blocking region ( | 07-05-2012 |
20120170439 | Objective Lens Element - An objective lens element having excellent compatibility with optical discs having different base material thicknesses is provided. The objective lens element has optically functional surfaces on an incident side and an exit side. At least either one of the optically functional surfaces on the incident side and the exit side includes a diffraction portion which satisfies at least either one of the following formulas (1) and (2): | 07-05-2012 |
20120182852 | OBJECTIVE LENS, OPTICAL HEAD, OPTICAL DISK APPARATUS, AND INFORMATION PROCESSING APPARATUS - An objective lens, an optical head, an optical disk apparatus and an information processing apparatus which can suppress deterioration of a focal spot caused by a drop in the diffraction efficiency are provided. An inner circumference area ( | 07-19-2012 |
20120207008 | Objective Lens Element and Optical Head Device Including the Same - An objective lens element having improved diffraction efficiency at least one of used wavelengths is provided. The objective lens element includes one surface including: a first region including an optical axis; and a second region surrounding the first region. A periodic first diffraction structure is formed on the first region, and a periodic second diffraction structure different from the first diffraction structure is formed on the second region. The objective lens element satisfies the following conditions. | 08-16-2012 |
20120213044 | MANUFACTURING METHOD FOR OPTICAL RECORDING MEDIUM, OPTICAL RECORDING MEDIUM, OPTICAL INFORMATION DEVICE, AND INFORMATION REPRODUCING METHOD - Shape-wise thicknesses of a cover layer and first through (N−1)th intermediate layers of an optical recording medium having refractive indexes nr | 08-23-2012 |
20120213045 | MANUFACTURING METHOD FOR OPTICAL RECORDING MEDIUM, OPTICAL RECORDING MEDIUM, OPTICAL INFORMATION DEVICE, AND INFORMATION REPRODUCING METHOD - Shape-wise thicknesses of a cover layer and first through (N−1)th intermediate layers of an optical recording medium having refractive indexes nr | 08-23-2012 |
20120213052 | OPTICAL HEAD, OPTICAL DISC DEVICE, INFORMATION PROCESSING DEVICE, AND OBJECTIVE LENS - Provided are an optical head capable of favorably recording or reproducing information to or from an information recording medium including a plurality of information recording surfaces, an optical disc device including the optical head, an information processing device including the optical disc, and an objective lens. The optical head ( | 08-23-2012 |
20120314558 | COMPOSITE OBJECTIVE LENS, DIFFRACTION ELEMENT, OPTICAL HEAD DEVICE, OPTICAL INFORMATION DEVICE, OBJECTIVE LENS DRIVING METHOD AND CONTROL DEVICE - In an optical head device which performs recording/reading of data in/from a high-density optical disc using an objective lens with a large NA, a saw-tooth shape diffraction element is used for also performing recording/reading of data in/from a conventional optical disc, such as DVD, CD, or the like. A step difference that produces an optical path length for blue light which is equal to or longer than the wavelength of the blue light and optical path lengths for red and infrared light which are shorter than the wavelengths of the red and infrared light is utilized so as to exert an inverse action on the blue light to those exerted on the red and infrared light. The effect of increasing the working distances for CD and DVD enables multiple compatibility. The optical element is integrally combined with the objective lens to perform a tracking servo following operation. | 12-13-2012 |
20120320728 | OBJECTIVE LENS, OPTICAL HEAD AND OPTICAL DISK DEVICE - A lens surface ( | 12-20-2012 |
20130021884 | OPTICAL DISK DRIVING APPARATUS, OPTICAL DISK DRIVING SYSTEM, VEHICLE EQUIPPED WITH OPTICAL DISK DRIVING SYSTEM, METHOD OF CORRECTING SPHERICAL ABERRATION IN OPTICAL DISK DRIVING APPARATUS, PROGRAM AND RECORDING MEDIUM - An optical disk driving apparatus includes an optical head device having a laser light source, a converging optical system converging a light beam emitted by the laser light source onto an optical disk, a photo detector receiving reflected light reflected by the optical disk, and an aberration correcting optical system controlling aberration of the converging optical system; a motor rotating the optical disk; and a control section receiving a signal from the photo detector, wherein the converging optical system has an objective lens formed using resin as a main material, the aberration correcting optical system has a spherical aberration correcting element correcting spherical aberration, and the control section evaluates quality of a reproduction signal for information in the optical disk by using the reflected light received by the photo detector, and utilizes a result of the evaluation to perform closed loop control on the spherical aberration correcting element. | 01-24-2013 |
20130064057 | OBJECTIVE LENS, OPTICAL HEAD, OPTICAL DISK DEVICE, AND INFORMATION PROCESSING DEVICE - A disclosed objective lens includes: a lens having an entrance surface and an emission surface; and an anti-reflection coat formed on the emission surface, wherein a transmittance T | 03-14-2013 |
20130170042 | OBJECTIVE LENS ELEMENT - An objective lens element having excellent compatibility with optical discs having different base material thicknesses is provided. The objective lens element has optically functional surfaces on an incident side and an exit side. At least either one of the optically functional surfaces on the incident side and the exit side includes a diffraction portion which satisfies at least either one of the following formulas (1) and (2): | 07-04-2013 |
20140098656 | OPTICAL ELEMENT - An optical element has at least one surface divided into a plurality of regions and includes: a first region configured to converge light with a wavelength λ | 04-10-2014 |
20140146653 | OBJECTIVE LENS ELEMENT AND OPTICAL HEAD DEVICE INCLUDING THE SAME - An objective lens element having improved diffraction efficiency at at least one of used wavelengths is provided. The objective lens element includes one surface including: a first region including an optical axis; and a second region surrounding the first region. A periodic first diffraction structure is formed on the first region, and a periodic second diffraction structure different from the first diffraction structure is formed on the second region. The objective lens element satisfies the following conditions. | 05-29-2014 |
20140247493 | OBJECTIVE LENS ELEMENT - An objective lens element which has excellent compatibility with optical discs having different base material thicknesses is provided. An objective lens element | 09-04-2014 |
20140254345 | OBJECTIVE LENS, OPTICAL HEAD, OPTICAL DISK DEVICE, AND INFORMATION PROCESSING DEVICE - Assuming that third-order coma aberration per unit angle generated by tilt of BD ( | 09-11-2014 |
20140269244 | OPTICAL HEAD, OBJECTIVE LENS, OPTICAL DISC DEVICE, COMPUTER, OPTICAL DISC PLAYER AND OPTICAL DISC RECORDER - An objective lens ( | 09-18-2014 |
20140321252 | OPTICAL INFORMATION DEVICE, TILT DETECTION METHOD, COMPUTER, PLAYER, AND RECORDER - A photodetector outputs a first signal and a second signal corresponding to light amounts of the received first light flux and the received second light flux, first and second low band extraction circuits extract low band components of the first signal and the second signal, first and second high band extraction circuits extract high band components of the first signal and the second signal, a differential circuit calculates a difference signal between a high band component difference signal as a difference between the high band component of the first signal and the high band component of the second signal and a low band component difference signal as a difference between the low band component of the first signal and the low band component of the second signal, and a control signal processing section generates a tilt control signal based on the calculated difference signal. | 10-30-2014 |
20140341007 | OPTICAL INFORMATION DEVICE, CROSS-TALK REDUCTION METHOD, COMPUTER, PLAYER, AND RECORDER - A ratio Xm of an information item recorded on an adjacent track relative to an information item recorded on a main track included in a first signal obtained from a first light flux having passed through a center region ( | 11-20-2014 |