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Match Document Document Title
7345987 Optical disc which stores digital information in informational units which diffract a line of laser light at one of 1024 angles and a corresponding light detecting apparatus for reproducing information from said optical disc  
The present invention includes an optical disc whose informational units each contain a raised pad designed to reflect laser light at a compound angle which is 45 degrees from the disc surface and...
7180834 Apparatus and methods for digital data recording  
An apparatus for holding digital data. The apparatus includes a medium in which a plurality of dimples are spaced for tracking by a playing apparatus. Each dimple includes a plurality of facets,...
6898169 Optical pickup head device, information recording/reproducing apparatus, and method for recording information  
An optical pickup head device includes a diffraction grating for generating zero-order diffracted light and at least first-order diffracted light and provides a tracking error signal with a DPP...
6891675 Optical device  
There is disclosed an optical device in which a first light source for outputting a first wavelength light is apart from a second light source for outputting a second wavelength light by a...
6683832 Optical recording/reproducing apparatus for writing and/or reading data to and/or from optical recording medium having data recorded in pit trains of mutually different depths  
In an optical disc recording medium having formed thereon a first pit train and a second pit train, these pit trains are formed to be different in pit depth from each other and meet following two...
6600711 Optical recording medium including prepit sequence formed at predetermined interval between land track and neighboring groove track along spiral  
An optical recording medium includes a land track and a groove track formed as a recording track to record and write information. A prepit sequence is formed on a middle position between the land...
6556537 Optical recording medium having two pit trains of mutually different depths, and master for manufacturing the optical recording medium  
In an, optical disc recording medium having formed thereon a first pit train and a second pit train, these pit trains are formed to be different in pit depth from each other and meet following two...
6529463 Very-high-density memory device utilizing a scintillating data-storage medium  
A very-high-density memory device which utilizes a scintillating medium for data storage. In one mode, the device operates as a read-only-memory (ROM) unit. In another mode, the device functions as...
6512732 Device for optically scanning information tracks on a plane using two subbeams  
A device for optically scanning an information plane having tracks. Radiation is supplied by a radiation source focused on the information plane by an objective system. The beam reflected by the...
6400671 Optical head device  
In a photodetector, the minimum size of the photodetection area for detecting a focus error signal from a light beam on the inner radius side of a hologram is made smaller than the minimum diameter...
6091693 Optical recording medium and optical information storage unit  
An optical recording medium is made up of an optically transparent substrate having a groove and a land which have approximately the same width and are formed spirally or concentrically, where the...
5875170 Optical data carriers and reading devices therefor  
An optical data carrier is written along data tracks with diffraction patterns, each diffraction pattern representing a predetermined bit sequence with n bits. The bit sequences of a diffraction...
5838651 Optical read-out head capable of improved read-out of media with different pit heights  
In an optical read-out head used for a multi-value information recording medium, fluctuations in a reproduction signal-to-noise ratio can be greatly reduced to reproduce reflected light with...
5761175 Apparatus and method for reproducing information recored on an optical recording medium on which pits with 2.sup.N depths are formed  
An apparatus for reproducing information recorded on an optical recording medium comprising a substrate on which a series of pits which have depth of 2 N (N is an integer equal to or more than 2)...
5659536 Optical storage method and device for storing and reading digital information  
Disclosed is a system for the recording of data on optic disks. Presently used optic disks, which can be read with lasers working in wavelengths of the visible region (between 0.5 and 0.8 microns),...
5644565 Optical recording medium including a plurality of diffracted grating cells  
In an optical information recording medium of this invention, at least one cell including diffraction gratings is disposed on a planar substrate. This cell is divided into n (n is an integer of 2...
5625619 Optical recording medium having a plurality of different diffraction grating cells  
In an optical information recording medium of this invention, at least one cell including diffraction gratings is disposed on a planar substrate. In accordance with exemplary embodiments, a ratio...
5602819 Optical information system to detect reflection of pit depth by evanescent wave  
The information recording and reproducing apparatus includes: a recording medium including a plurality of concavo-convex pits; a light source for emitting laser light; a section for changing an...
5577016 Recording medium having concavo-convex pits with a maximum and a minimum pit depth depending on the wavelength of a laser light  
The information recording and reproducing apparatus includes: a recording medium including a plurality of concavo-convex pits; a light source for emitting laser light; a section for changing an...
5572508 Optical disc having square information pits arranged in symmetrical patterns  
An optical disc is provided with a plurality of information units arranged in the circumferential direction on the track, each of which has a square shape, and has a predetermined unit length in...
5570338 Optical information recording medium which uses diffraction grating  
In an optical information recording medium of this invention, at least one cell including diffraction gratings is disposed on a planar substrate. This cell is divided into n (n is an integer of 2...
5553051 Increased intensity optical recording medium with adjacent grooves of different optical depth and a method and apparatus for reproducing the same  
An optical recording medium on which information is recorded by irradiating the medium with a light spot to cause a characteristic change of an actual reflection factor, the optical recording...
5539722 Optical information reproducing system with a reading beam having frequency components of N wavelengths corresponding to four times the N depths to a row of pits  
Disclosed is an optical disk having at least one pit in each of unit areas continuously provided in a circumferential direction of the disk, said pit having a depth of at least one of n depths (n:...
5530641 Optical recording medium having grooves and lands and/or plural pit lines, and reproducing apparatus therefor  
A recording film of a recording medium has tracks with a track pitch of 1.6 μm. Each track has a land and a groove, and the width of each of the land and groove is about 0.8 μm. The groove and...
5500849 Construction of optical disk  
An optical disk apparatus is provided which includes an incident light optical system which causes a light beam, having a wavefront aberration in which an odd function component with respect to two...
5493552 Phase change optical information recording system with a header area in the form of prepit rows  
An optical recording and readout system comprises a first optical system for projecting a plurality of optical beams onto a phase-change optical disk, a second optical system for picking out the...
5485441 Method of optically reading information, optical pickup apparatus and optical reproducing apparatus  
A method of optically reproducing information from an optical recording medium on which concave or convex signal pits are formed, is provided with the steps of: irradiating each of pit edge...
5471455 High density optical storage system  
Digital information is represented by surface steps orthogonal to the surface of a record carrier, said steps having a plurality of values between one tenth and 10,000 nanometers. The steps are...
5463609 Information recording and reproducing device and a method using the same  
The information recording and reproducing apparatus includes: a recording medium including a plurality of concavo-convex pits; a light source for emitting laser light; a section for changing an...
5444689 Detection of phase and amplitude modulation information on optical medium with a waveguide  
An optical recording medium includes a substrate, first information for modulating a phase of read light radiated on the substrate, and second information for modulating an amplitude of the read...
5436883 Recording medium and information recording and reproducing apparatus therefor  
A recording medium from which recorded information is reproduced by irradiating a read-out light, including an information recording surface and a plurality of information recording surface and a...
5339304 Optical disc having two-step pit structure and pickup apparatus  
An optical disc has a two-step pit structure in which first pits and second pits whose depth is a half of that of the first pits are arranged in superposition in the same track direction. A first...
5331623 Optical retrieval system for encoding pit angular data and optical recording element therefor  
In the optical recording element of the invention, alignments of long thin pits inclined in various directions with respect to the track direction are formed on the tracks and information is...
5291471 Recording/reproducing system using phase encoding of optical storage medium  
Apparatus and method for encoding information and recording same as sets of spaced and variably phased marks stored on the optical record wherein the encoded information is read by illuminating...
5285274 Optical waveguide recording medium and apparatus for playing the same  
An optical waveguide recording medium including an optical waveguide having a photocoupler for receiving a light beam, and a plurality of refractive index-discontinuous portions aligned on the...
5278816 Recording/reproducing system using wavelength/depth selective optical storage medium  
Apparatus and method for encoding information and recording same as sets of variably spaced related marks stored in wavelength (color) and/or depth selective layers on the optical record wherein...
5235587 Optical data storage apparatus and method  
An optical data storage apparatus and disc in which information is stored in the form of multiple submicron depths at information-storage sites on the disc surface. The depth information is read by...
5220556 Optical disk with identification phase-encoded area  
An optical disk having a recording area and an identification phase-encoded part (PEP) area with pits from which system data on the optical disk is reproduced without tracking, in which when the...
5179547 Phase change optical information recording medium including means for preventing movement of the recorded portion  
On the phase change optical information recording medium, a plurality of protection pits each smaller than one pit on the pre-pit region are provided over the entire data region of the recording...
5168490 Record carrier with optically readable phase structure having tracks with different phase depths and apparatus for reading such a record carrier  
A record carrier having information stored thereon in tracks comprised of areas separated from each other in the track direction by intermediate regions which are optically distinguishable from the...
5166989 Integrated polarization detection system  
A substrate has a pair of overlapping optical couplers for separately coupling a first and a second polarization component of a light beam into a first and a second waveguide channel. The channels...
5117412 Optical disc with servo pattern providing enhanced reliability of servo clock detection and apparatus for accessing the optical disc  
An optical disc having a plurality of information tracks. Each information track having a data field including multiple data bytes and a servo field including a first servo byte having a pair of...
5084860 Apparatus for optical disc memory with correction pattern and master disc cutting apparatus  
A record carrier having a disc-shaped substrate and a recording layer for optically writing information therein is disclosed which includes a guide groove extended in the rotational direction of...
5060223 Optical type information recording medium having specified pit and guide groove shapes  
An optical type information recording medium has guide grooves for tracking formed in a concentric or spiral shape at a predetermined pitch; and a pre-format pit formed approximately midway between...
4963464 Optical medium having pits of different depths, and method and apparatus for reproducing information therefrom  
An optical information recording medium includes a plurality of kinds of pits independently representing information and having different depths, wherein the plurality of kinds of pits are formed...
4959822 Record-carrier body provided with a relief structure of optically detectable servo-track portions and sector addresses and apparatus for forming said structure  
A record carrier body is disclosed which is, provided with sector addresses and servo-track portions. The maximum width of the servo-track portions is at least 60% of the track period, in a...
4949331 Apparatus and record carrier for optical disc memory with correction pattern and master disc cutting apparatus  
A record carrier having a disc-shaped substrate and a recording layer for optically writing information therein is disclosed which includes a guide groove extended in the rotational direction of...
4932015 Method of reproducing signals from optical disk  
A method of reproducing signals formed in slant surfaces of a V-shaped track groove formed in an optical disk. The beam reflected from each slant surface has a portion having a small crosstalk...
4930116 Record carrier containing information in an optically readable information structure  
A record carrier is described having an optically readable information structure comprising information areas arranged in information tracks and spaced from each other by intermediate areas. The...
4839882 Record carrier with an optically readable trackwise-arranged information structure  
A record carrier is described with an optically readable trackwise-arranged information structure, and an apparatus for reading said carrier. The distances between the tracks of the information...
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