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7391700 |
Optical storage in discs having multiple data layers
Optical pick-up apparatus for retrieving data stored on an optical storage disc having a plurality of record layers ( 6, 7 ), the radiation beam reflected back from the disc when a first layer ( 7...
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7388822 |
Liquid crystal lens element and optical head device
A liquid crystal lens element having a lens function is provided, which is small sized without having moving part, and which can stably carry out correction of spherical aberration containing a...
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7385905 |
Apparatus for reading from and/or writing to optical recording media
When an optical recording medium having a plurality of data layers is being read from and/or written to, the input beam experiences an aberration, inter alia in the top layers of the data layers....
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7362688 |
Optical scanning device
An optical scanning device for scanning first and second type of record carriers includes a radiation-generating device for generating a radiation beam having first and second wavelengths in the...
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7362687 |
Method and device for holographic recording
A holographic recording method for recording information as phase information of light by projecting a signal beam and a reference beam onto a recording medium, wherein an X direction is defined as...
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7358471 |
Optical head device
An optical head device includes a light source which emits a light beam, an objective lens which condenses the light beam on the optical disk, a condensing lens which condenses reflected light from...
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7355952 |
Liquid crystal device, its driving method, and driving apparatus
A liquid crystal device, and a method and an apparatus for driving the same in which the refractive index of the liquid crystal device is adjusted using a simple driving method and apparatus, which...
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7352664 |
Optical element, optical head, optical recording reproducing apparatus and optical recording/reproducing method
The invention presents an optical element with which an optical head can be configured, in which there is little deterioration of the correctional effect when the objective lens shifts, as well as...
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7345981 |
Optical pickup
An optical pickup including an optical member which inhibits interference light reflected from an adjacent layer from being received by a photodetector when an optical information storage medium...
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7324255 |
Spatial optical modulator
A spatial light modulator, in which light modulation elements are arranged in a same plane. In the spatial light modulator, a plurality of the light modulation elements are arranged such that there...
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7310297 |
Optical disk device
This invention provides an optical disk device comprising an optical pick-up being structured to irradiate light beams onto an optical disk through an objective lens unit, receive the light beams...
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7301869 |
Spherical aberration correcting method and apparatus
In a spherical aberration correcting apparatus, a test recording unit is configured to perform a test recording on an optical disk. A characteristic obtaining unit is configured to obtain a...
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7298686 |
Optical pickup and optical disk reproducing device
An optical pickup in an optical disk reproducing device is operable to switch operations between a low-power operation mode and a high-power operation mode, and includes a liquid crystal element...
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7283439 |
Optical disk apparatus using mechanism for controlling spherical aberration
In the past there has been a problem that on a detection surface the influence of interference causes a defocusing signal to degrade, narrowing the range in which spherical aberration can be stably...
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7277619 |
Nano-imprinted photonic crystal waveguide
This invention relates to a method for forming a nano-imprinted photonic crystal waveguide, comprising the steps of: preparing an optical film on a substrate; preparing a template having a...
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7272099 |
Exposure apparatus of an optical disk master, method of exposing an optical disk master and pinhole mechanism
An exposure apparatus of an optical disk master having a laser source, a deflector for deflecting a recording laser beam obtained based on the laser beam of the laser source and an objective lens...
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7262820 |
Liquid crystal panel, optical pickup, and information reproducing apparatus
The transparent electrode of the liquid crystal panel includes the first partial electrode portion constituted by the pattern electrodes and the second electron portion constituted by the pattern...
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7257070 |
Optical disc recording and/or reproducing apparatus and aberration adjustment method
The astigmatic aberration in an optical system is to be adjusted. Specifically, in an optical disc device on which can be selectively loaded a first optical disc having a first index of double...
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7251203 |
Optical disc drive apparatus, information reproducing or recording method
Disclosed here is a method for solving a conventional problem that no spherical aberration signal can be detected from any push-pull signal that is easy to adjust an object photodetector when a...
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7248543 |
Tilt servo system for correcting tilt angle of light beam in information read/write apparatus
A highly accurate and stable tilt servo system is provided. A liquid crystal device for phase correction is driven based on drive data stored in a lookup memory to thereby make a tilt correction....
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7242510 |
Aberration correction element, optical pickup, and information equipment
An aberration correction element is intended to correct an aberration. The aberration correction element is placed in a middle of an optical path between a light source and an optical element for...
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7236444 |
Wavefront aberration correcting device and optical pickup equipped with the same
An object of the present invention is to provide a wavefront aberration correcting device comprising a liquid crystal device that maximizes transmittance and minimizes light transmittance...
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7209426 |
Liquid crystal optical element and optical device
The invention is directed to the provision of a liquid crystal optical element, for correcting wavefront aberrations (principally, coma aberration and spherical aberration), that can be mounted...
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7209415 |
Optical pickup device and recording and/or reproducing device
Provided are an optical pickup device, which is capable of detecting and correcting spherical aberration while suppressing an increase in the number of construction elements and without increasing...
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7202919 |
Holographic data storage with PDLC spatial light modulator generating reference and object beams
The invention is directed to a holographic data storage system including a spatial light modulator device (SLM) that comprises optical elements in the form of polymer dispersed liquid crystal...
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7177259 |
Optical head and optical recording medium drive device
The present invention is directed to an optical head adapted for performing recording or reproduction of information signals with respect to an optical disc ( 102 ), which controls light coupling...
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7170846 |
Light receiving and emitting unit and optical pickup using the same
A light receiving and emitting unit has a plurality of light sources, a light receiving element, a light control unit, and an optical block. The optical block has at least a first and a second...
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7170845 |
Aberration correcting apparatus
An aberration correcting element includes a first aberration correction element movable along the optical axis of the light beam for correcting the aberration of the light beam; a driver for...
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7170832 |
Optical scanning device
A optical scanning device ( 1 ) for scanning an information layer ( 2 ) with a radiation beam ( 25 ) in a writing mode and a reading mode comprises a radiation source ( 7 ) for emitting the beam...
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7154837 |
Optical pickup and optical information recording/reproducing device
An optical pickup and an optical information recording/reproducing device are provided, each of which is capable of forming a super-resolution spot to conduct micro-mark recording, and does not...
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7151724 |
Disk recording apparatus and disk recording method
A disk recording apparatus for recording data to a disk includes: a reading and writing element for emitting a read beam onto the disk to read out recorded data therefrom while emitting a plurality...
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7126901 |
Device and unit for correcting aberration of light beam
An aberration correcting unit is provided for correcting an aberration of a light beam radiated onto an object to be detected and then reflected from the object. This unit comprises an aberration...
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7120106 |
Optical disc recording and/or reproducing apparatus and aberration adjustment method
The astigmatic aberration in an optical system is to be adjusted. Specifically, in an optical disc device on which can be selectively loaded a first optical disc having a first index of double...
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7110343 |
Spherical aberration correction apparatus
An aberration correction apparatus includes a first aberration correction element having aberration correction portions, a second aberration correction element which causes the wave front of the...
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7095701 |
Optical disc recording and/or reproducing apparatus and aberration adjustment method
The astigmatic aberration in an optical system is to be adjusted. Specifically, in an optical disc device on which can be selectively loaded a first optical disc having a first index of double...
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7079470 |
Diffraction device for reading and/or writing a record carrier
A device for reading and/or writing a record carrier ( 13 ), the device comprising converging means ( 35, 45, 47, 106, 108 ) for focusing a radiation beam ( 27, 101 ) originating from a radiation...
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7068583 |
Nano-scale resolution optical pickup for reading/writing ultra-high density data on CD and DVD data storage elements
A single high resolution holographic pickup, for reading/writing both a CD and DVD optical recording medium, has an electrical tuning control for applying a DC and AC signal to a tunable Bragg...
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7068572 |
Optical head and optical disk apparatus
To stably carry out recording and reproducing to and from a high density optical disk without using a double servo in the optical disk using a high NA objective lens. A detection of a spherical...
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7054253 |
Optical head
An optical head device including a phase correcting element having an anisotropic optical medium sandwiched between a pair of substrates. The paired substrates have surfaces provided with...
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7031247 |
Liquid crystal driver and optical head for tilt correction
Tilt which is inclination of a normal of optical disk relative to optical axis of optical head is corrected with a liquid crystal element. In a driver for the liquid crystal element, a periodic...
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7019812 |
Liquid crystal optical element and an optical device
The present invention provides a compact liquid crystal optical element for optical modulation and a compact optical device. A liquid crystal optical element for optical modulation is prepared by...
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7012875 |
Optical disk apparatus using focal shift signals to control spherical aberration
In the past there has been a problem that on a detection surface the influence of interference causes a defocusing signal to degrade, narrowing the range in which spherical aberration can be stably...
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7002892 |
Optical pickup reproducing apparatus having reading compatibility among recording media with respective recording densities different from one another
A liquid crystal element is provided as a polarization plane rotating device between a laser beam source and a beam splitter. Light emitted from the laser beam source passes through the liquid...
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6977881 |
Optical pickup with holding mechanism to effectively prevent comatic aberration
In an optical pickup, an objective lens and an aberration correcting mechanism are held so that they can be moved together.
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6950384 |
Optical pickup appratus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method
An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a...
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6950383 |
Objective lens, light converging optical system, optical pickup apparatus, and recording and/or reproducing apparatus
An objective lens for recording and/or reproducing information of an optical information recording medium, is a single lens having an aspherical surface on at least one surface. The objective lens...
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6944104 |
Method of moving optical pickup, optical pickup, and optical disc apparatus
The present invention can simplify and miniaturize an optical pickup and further can prevent the deterioration of various characteristics even if an aberration correction mechanism is composed of a...
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6940798 |
Optical-disk reproducing apparatus, optical pickup apparatus and optical-disk recording and reproducing apparatus
The present invention is capable of selectively reproducing an information signal from an optical disk with any of a plurality of types having different track pitches of recording tracks, that is,...
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6937381 |
Optical pickup device
An optical pickup device which includes (A) a light source, and (B) an objective lens and an aberration correcting optical system which are located in a light path from the light source to an...
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6934226 |
Optical disk apparatus
The quantity of spherical aberration correction is predetermined for each recording plane of an optical disk on which focusing control is performed. Before operating the focusing control, the...
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