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| Number | Title | Issue Date |
| 8139463 | Objective lens, optical pickup, and optical disc apparatus Provided is an objective lens for selectively focusing each of light beams having three wavelengths λ1, λ2, and λ3 on a signal recording surface of a corresponding optical disc, the wavelengths λ1, λ2, and λ3 satisfying at least a r... | 03/20/2012 |
| 8134907 | 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 transmi... | 03/13/2012 |
| 8107346 | 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 se... | 01/31/2012 |
| 8094540 | Optical pickup and optical device An optical pickup includes a first laser beam light source 1 for emitting a light flux of a first wavelength, a diffraction grating 5 and an optical device 6 having a second laser beam light source 7 for emitting a light flux of a second ... | 01/10/2012 |
| 8064314 | Optical head and optical disc device A compact and inexpensive optical head that enables stable compatible playback and compatible recording with optical discs of different kinds with the use of a single objective lens is achieved. The order of diffracted light at which the diffraction efficiency by a ... | 11/22/2011 |
| 8054733 | Optical pickup device An optical pickup device has an astigmatism element, a polarization setting element, and a polarizer. The astigmatism element converges laser light reflected on a disc in a first direction and a second direction to form a first focal line and a second focal line. Th... | 11/08/2011 |
| 8045443 | Optical pickup apparatus An optical pickup apparatus comprising: a laser-light source that selectively emits first and second laser lights parallel with each other; a diffraction grating that includes a plurality of periodic structures joined to be different in phase from each other in a di... | 10/25/2011 |
| 8040779 | Optical pickup device and optical disc device An optical pickup device includes an astigmatism element which sets focal line positions to be defined by convergence of laser light away from each other, a diffraction element which diffracts four light fluxes obtained by a light flux of the laser light to disperse... | 10/18/2011 |
| 8040778 | Diffraction element and optical head device equipped therewith A grating portion has a plurality of convex portions provided on at least one principal plane of a transparent substrate having a first layer containing a first transparent material and a second layer containing a second transparent material, and extended in paralle... | 10/18/2011 |
| 8036090 | Optical pickup device Provided is an optical pickup device capable of stabilizing a tracking signal and a focusing signal and of preventing quality deterioration of a data signal by eliminating a multi-layer crosstalk. Of reflected lights from a multi-layer disc, a reflected light from a... | 10/11/2011 |
| 8036091 | Optical pick-up and optical information recording and reproducing apparatus An optical pick-up which permits the relative position of a diffracting optical element and a photodetector to be adjusted by feedback control with signals which are generated when more than one kind of diffracted light differing in order is received, the diffracted... | 10/11/2011 |
| 8018815 | Micro-Fresnel zone plate optical devices using densely accumulated ray points An embodiment generally relates to an optical device suitable for use with an optical medium for the storage and retrieval of data. The optical device includes an illumination means for providing a beam of optical radiation of wavelength λ and an optical path that ... | 09/13/2011 |
| 8014256 | Optical pickup and information device An optical pickup for irradiating an information recording medium, such as a DVD, with a laser beam when an information signal is recorded or reproduced, and information equipment provided with the optical pickup. ... | 09/06/2011 |
| 8004954 | Optical pickup, optical disk device, computer and optical disk recorder A diffraction grating is constituted such that directions of diffraction are disposed asymmetrically with respect to the optical axis, by causing light subjected to aperture restriction to have a difference of one half wavelength in the optical path length by making... | 08/23/2011 |
| 7986605 | Optical pickup and optical disc apparatus using the same An optical pickup includes a light source emitting a light beam, an objective lens condensing the light beam emitted from the light source onto an optical disc, at least one divergent angle conversion lens (collimator lens) disposed between the light source and the ... | 07/26/2011 |
| 7965610 | Optical pickup device In an optical pickup capable of removing inter-layer crosstalk, a dark line that may appear in a central portion of a beam is removed. Thereby, an error in a data signal is reduced. Reflected light from a multi-layer disc is split into two parallel bundles with a sp... | 06/21/2011 |
| 7965609 | Optical pickup device and optical recording medium information reproduction device The present invention provides an optical pickup device and optical recording medium information reproduction device that are capable of reproducing information that is recorded on a plurality of kinds of optical discs having different track pitches. With the presen... | 06/21/2011 |
| 7911921 | Diffraction optical element, molding die for the optical element and manufacturing method thereof A diffraction optical element is provided to reduce harmful lights and also suppress deterioration in the optical characteristics of the element. The diffraction optical element 22 is formed with a plurality of diffraction gratings 17′, 18′, 19′ ... | 03/22/2011 |
| 7885165 | Optical pick-up device An optical pickup device according to an embodiment of the present invention comprises a light source for projecting a beam of light to record and reproduce information with respect to an optical recording medium. A collimating lens is disposed on a path of the ligh... | 02/08/2011 |
| 7872957 | Optical pickup and optical data processing device using the same An optical pickup including a light source, a light focus device, a diffraction element, an optical split element, a ¼ wavelength board, a light reception device and a correction element wherein the correction element is divided into multiple areas in a surface ver... | 01/18/2011 |
| 7852735 | Optical pickup device A diffraction element is disposed between a beam branching element (such as a beam splitter) and a photodetector. The diffraction element further segment an interference fringe introduced into stray light by a diffraction grating which divides a laser beam emitted f... | 12/14/2010 |
| 7835250 | Optical pickup device and information recording/reproduction device The present invention makes it possible to accurately and adequately adjust the position where sub beams are shone when performing tracking correction or CTC using three beams. The invention adjusts the positions where the sub beams are shone onto the surface... | 11/16/2010 |
| 7821899 | Optical pickup device The present invention provides an optical pickup device requiring no position adjustment of a diffraction grating at the time of assembling the optical pickup device, and capable of suppressing fluctuations in a differential push-pull signal amplitude and cancelling... | 10/26/2010 |
| 7821900 | Diffractive optical element and method of designing the same A transmissive or reflective diffractive optical element, comprising: a substrate having a top surface, the top surface being etched into a pattern, the pattern including a periodic surface pattern of grooves formed such that when an incoming light beam is shone ont... | 10/26/2010 |
| 7801008 | Diffractive optical element, objective optical system including the same, and optical pickup including the same A diffractive optical element includes a first optical part and a second optical part bonded to each other with a bonded surface therebetween configured as a diffraction surface. In this diffractive optical element, the diffraction order of diffracted light with the... | 09/21/2010 |
| 7778138 | Objective optical element for optical pickup device, optical element for optical pickup device, objective optical element unit for optical pickup device and optical pickup device An optical element for optical pickup device is provided with an optical path difference providing structure which provides a substantial phase change to a light flux having a predefined wavelength. The optical path difference providing structure is provided with a ... | 08/17/2010 |
| 7729227 | Diffractive element, method of manufacturing the same, optical pickup device, and optical disc apparatus There is provided a diffractive element including a first member 2, which includes a first resin 2a and has a predetermined refractive index, and a second member 3, which has the same refractive index as the first member 2 having t... | 06/01/2010 |
| 7729228 | Optical pickup and optical disc apparatus An optical pickup which includes first to third light sources each emitting a light beam each having a first to third wavelength; an objective lens condensing each of the light beams emitted from the light sources on a signal recording face of an optical disc; a col... | 06/01/2010 |
| 7706235 | Optical pickup device Disclosed herein is an optical pickup device. In an embodiment of the present invention, sub beams from which an AC component has been removed are generated using a first diffractive element based upon properties that a beam incident on a disc is reflected with bein... | 04/27/2010 |
| 7697394 | Optical pickup and optical information recording apparatus using the same An optical pickup includes a diffraction grating partitioned into three areas, in which the phase of periodic grating groove structure in an area is successively shifted from that in the adjacent area by 90°. In the generation of a differential push-pull signal, an... | 04/13/2010 |
| 7697393 | Optical pickup and optical information recording apparatus using the same An optical pickup includes a diffraction grating partitioned into three areas, in which the phase of periodic grating groove structure in an area is successively shifted from that in the adjacent area by 90°. In the generation of a differential push-pull signal, an... | 04/13/2010 |
| 7602690 | Aberration adjustment device, method thereof, optical pickup, and optical information recording apparatus A method for adjusting an aberration is disclosed that adjusts the aberration existing in a light spot by using a control signal generated from a wobbling signal and a reproduction signal, and thereby maintaining an appropriate S/N ratio for both the wobbling signal... | 10/13/2009 |
| 7596070 | Device for reading and/or writing optical recording media The present invention relates to an appliance for reading from and/or writing to optical recording media 1 having a first laser diode LD1 for producing a first scanning beam AS1 at a first wavelength λ1 and having a second laser diod... | 09/29/2009 |
| 7593306 | Diffraction element and optical pick-up apparatus having the same A diffraction element for an optical pick-up apparatus is provided that enables more accurate focusing control. The diffraction element for an optical pick-up apparatus is divided into first and second regions, each being formed with a grid pattern in which grids ar... | 09/22/2009 |
| 7590043 | Optical pickup and optical information recording apparatus using the same An optical pickup includes a diffraction grating partitioned into three areas, in which the phase of periodic grating groove structure in an area is successively shifted from that in the adjacent area by 90°. In the generation of a differential push-pull signal, an... | 09/15/2009 |
| 7577076 | Tilt sensor using diffraction grating A tilt sensor for detecting information related to a tilt of an object to a reference plane is disclosed. The tilt sensor includes a diffraction element disposed that diffracts an incident light at diffraction efficiency depending on the incident angle, and a photo ... | 08/18/2009 |
| 7564762 | Optical head device and optical information recording or reproducing device A diffractive optical element for dividing a light emitted from a light source into a main beam and at least one sub-beam, an objective lens for focusing the beams on a disk-shaped optical recording medium with spiral tracks, and a photodetector for receiving the be... | 07/21/2009 |
| 7502298 | Optical pickup apparatus for optical data media of different formats and method thereof An optical pickup apparatus for reading and writing information from and to optical data media in different formats and a method thereof are provided. The optical pickup apparatus comprises a twin laser diode (Twin LD), a diffraction element for dividing a laser bea... | 03/10/2009 |
| 7443779 | Objective optical system for optical recording media and optical pickup device using it An objective optical system includes a diffractive optical element on the light source side of an objective lens for focusing incident light of three different wavelengths with two different numerical apertures onto three different optical recording media. The diffr... | 10/28/2008 |
| 7436750 | Optical storage with ultra high storage capacity Systems, materials, and methods for increasing the storage capacity of optical recording media are provided. In one aspect, the systems of the present invention take advantage of high NA optics to realize ultra high storage capacity. In another aspect, the systems o... | 10/14/2008 |
