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9007881 Optical head device and optical disc device  
An optical head device (11) provided with: an optical element (36) for transmissively diffracting a light beam emitted from a semiconductor laser (34), generating a zero-order diffracted light...
8958277 Information recording method, information reading method, and optical disc device  
An optical disc device and information recording/reading method for an optical disc in which a recording layer is formed through volume recording by aligning recording tracks, which hold...
8953424 Optical recording medium driving apparatus, and method of generating tracking error signal  
An optical-recording-medium driving apparatus includes: a light irradiating/receiving section configured to irradiate light on a medium so as to form a first side spot, a main spot, and a second...
8929184 Optical disk device with independent servo layer focus and tracking control on a multilayered disc  
There is a problem that when the relative angle between laser light and an optical disc is changed by temperature, or a chucking state of an optical disc and so forth, the formerly recorded data...
8867324 Reproducing device and reproducing method  
A reproducing device includes a light generation and emission unit that obtains signal light as reflection light, which reflects recording signals of a land and a groove, by irradiating an optical...
8830809 Optical information recording device  
An optical information recording/reproduction device includes a detection unit which detects a focus-direction height of a recording medium, a focus adjustment unit which adjusts a focus-direction...
8750083 Optical pickup apparatus and disc apparatus including the same  
An optical pickup apparatus includes at least: a light emitting element capable of emitting at least first wavelength light and second wavelength light; and a diffraction grating configured to...
8737180 Optical pickup device and optical disc apparatus for recording and reproducing information on and from optical disc including plurality of recording layers  
Provided is an optical pickup device that suppresses a fluctuation of a tracking error signal caused by stray light when recording/reproducing information on/from an optical disc including a...
8730775 Optical information reproducing device, optical information recording device, and method for recording optical information  
Multi-level recording is quite effective for attaining a larger capacity and a higher transfer rate in the case of an optical disk; however, with conventional technologies, a SIGNAL-TO-NOISE RATIO...
8687470 Optical disk playback device with three-dimensional playback functionality  
An optical disk playback device comprises one or more lasers, an optical assembly, an optical detector, and controller circuitry coupled to the optical detector. The optical assembly is configured...
8665679 Optical read/write apparatus and read apparatus  
In one embodiment, the optical read/write apparatus includes a plurality of optical pickups arranged to cross tracks of an optical storage medium and a control section. On finding the data that...
8644120 Optical information processing device and tracking control method thereof for use with grooveless multilayer optical disc  
An optical information device used with a grooveless multilayer disc including multiple recording layers used to record and reproduce information signals and a guide layer dedicated to detect...
8630154 Apparatus comprising a pickup providing multiple beams  
The apparatus includes a pickup for reading data from a super-resolution optical disc, the pickup comprising a laser for generating a main beam, a first and a second satellite beam, the two...
8619520 Lens driving unit for optical pickup and optical disc drive including the lens driving unit  
Provided is a lens driving unit for an optical pickup and an optical disc drive employing the lens driving unit. First and second driving coils are directly wound around a coil winding unit...
8619522 Optical pickup and optical read/write apparatus  
In one embodiment, an optical pickup includes an optical system which forms multiple light beams based on the light emitted from a light source and which converges a write beam and a read beam,...
8599661 Optical disk device, optical pickup, and optical recording medium  
The present invention can properly correct spherical aberration. An optical disk device (10) displaces an objective lens (18) so that the objective lens is displaced to a reference lens position...
8547814 Semiconductor laser device, optical pickup apparatus, and method of manufacturing semiconductor laser device  
In a diffractive element, its grating pattern is so configured that a diffraction angle of a diffracted light beam of a light source that is subject to the first-order diffraction in a diffraction...
8542560 Diffraction grating and optical pickup device  
Disclosed are a module to detect a tracking error signal that is easy to be assembled and robust against variation in a track angle, a diffraction grating, an optical pickup, and an optical disc...
8526284 Multilayer optical recording medium with interfacial surfaces  
A multilayer optical recording medium includes a plurality of interfacial surfaces that reflect an incident light beam, and neighboring ones of the interfacial surfaces has a spacer therebetween....
8514675 Suspension system for an optical pickup assembly  
A suspension system is provided for an objective lens housing. The objective lens housing is supported by the suspension system and is moved in either a tracking direction Y or focusing direction...
8503273 Optical disc device and recording method  
An optical disc device and a recording method is provided in which information can be additionally recorded on an optical disc, which has a servo layer and recording layers separately formed, by...
RE44397 Single objective lens for use with CD or DVD optical disk  
An optical disk reader or read/write system for CD or DVD formats. First and second laser diodes operating at different wavelengths have their output beams collimated and directed at a single...
8493831 Compatible optical pickup and optical recording and/or reproducing apparatus employing the same  
A compatible optical pickup including an optical unit and a focusing unit. The optical unit emits a short wavelength light for high-density recording media and a long wavelength light for...
8493824 Optical head and optical disc device  
A tilt can be detected highly accurately by minimizing the tilt detection error. An optical head includes: an objective lens for converging a light beam from a light source onto an optical disc; a...
8488425 Optical pickup device and optical disc apparatus  
An optical pickup device including: a laser diode for emitting laser light; an objective lens which irradiates an optical beam emitted from the laser diode; an actuator which displaces the...
8477577 Method for recording on and reading out from optical information recording medium  
Recording and reading method for optical information recording medium comprising: recording layer having thickness not less than 2λ/n, where λ is wavelength of recording beam and n is refractive...
RE44333 Optical device  
The present invention relates to an optical device which includes a first laser diode, a beam splitter, a first objective lens, a photo-detector, a second laser diode, a wedged plate beam...
8472300 Optical head device and optical disc device  
An optical head device mounted in an optical disc device. The optical head device is provided with a diffractive optical element and a photodetector. The diffractive optical element has: a primary...
8446802 Optical drive device and focus servo control method  
An optical drive device includes first and second light sources, an objective lens configured to receive a first light emitted from the first light source and a second light emitted from the...
8427921 Light emitting device, optical pickup apparatus and method for manufacturing the same  
In the present invention, to improve CD read/write characteristics having poor image height characteristics, a third light emitting source emitting a third laser beam for CD is disposed on an...
8416656 Reproducing method and reproducing apparatus  
A reproducing method includes: irradiating a laser spot for servo to which astigmatism making up a generally 45-degree angle in the tangential direction of an information recording track has been...
8415606 Configurable photo detector circuit  
A configurable photo detector circuit comprises a photo detector array including a plurality of photo detectors coupled to a plurality of amplifiers. A method for programming a detection pattern...
8400899 Optical pickup device with detection optical system  
A tracking signal and a focusing signal are stabilized by eliminating multi-layer crosstalk. The diffraction position, with respect to a semiconductor detector, from a center region of a...
8395975 Optical read/write apparatus  
In one embodiment, an optical read/write apparatus includes first and second optical pickups 2a, 2b and a control section. The first optical pickup 2a includes a first lens 3a that condenses a...
8385179 Optical disk device and optical disk discriminating method  
An optical disk discriminating method and an optical disk device which can detect reflected rays for making discrimination among kinds of optical disks with high accuracies. By switching a...
RE43961 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...
8335136 Optical pickup apparatus  
Provided is an optical pickup apparatus using a reduced number of parts. An optical pickup apparatus (26) of the present invention includes: a laser unit (108) for emitting a laser beam complying...
8331207 Optical pickup and optical disc unit  
For use with a multi-layer optical disc, an optical pickup can eliminate a problem of causing a focus error signal and a tracking error signal to fluctuate due to interference of a signal light...
8289831 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...
8284643 Recording apparatus and control method  
A recording apparatus for performing information recording using formation of marks by focusing a first light with an objective lens at a given position in a recording layer included in an optical...
8279725 Control device, control method, program, and recording medium  
A control device includes n optical pickups, n being an integer greater than one; a dividing unit configured to divide one block into n pieces of data, the one block being a predetermined amount...
8279724 Optical pickup  
An optical pickup has a first optical system and a second optical system. The optical axis of the first optical system and the optical axis of the second optical system are inclined, for example,...
8274875 Optical disc device and focus control method  
Disclosed is an optical disc device that is able to increase accuracy in reproducing information from an optical disc. The optical disc device 10 calculates a focus error signal SFE2 and a sum...
8270281 Optical pickup device and optical disc apparatus using same  
According to the present invention, of all beams of light reflected from the optical disc, only light in a peripheral region excluding a push-pull region is used to generate a DPD signal. In this...
8264922 Optical disc drive having a mechanism to reduce the noise level of a focus error signal  
There is provided an optical disc drive, which includes a light source emitting a light beam, a beam dividing element that divides the light beam into main and sub-beams, an objective lens, an...
8254224 Servoing system for master with parallel tracks in a holographic replication system  
Techniques are provided for controlling the reading of optical data from a master disk in a holographic replication system. Imperfections in the master disk or movement of the disk during a...
8238210 Optical recording medium, optical recording medium driving apparatus, and optical recording medium driving method  
An optical recording medium driving apparatus includes an optical pickup which irradiates first and second laser lights from one object lens with respect to an optical recording medium having a...
8238221 Optical pickup device and recording/reproduction device  
An optical pickup device includes: a first light source for emitting recording laser light; a second light source for emitting reproducing laser light having a wavelength different from a...
8213278 System comprising an optical disc and an apparatus for reading of respective data  
The optical disc comprises a substrate layer and a data layer disposed on the substrate layer, the data layer having a mark/space data structure arranged in tracks which are arranged in groups...
8213279 Optical recording medium and optical recording-reading method  
An optical recording medium including recording and reading layers and a servo layer increases the recording capacity thereof. In the optical recording medium including the plurality of recording...