Matches 401 - 450 out of 699 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 >
Match Document Document Title
5604013 Magnetic recording medium and recording/reproducing method  
A magnetic recording medium comprising a non-magnetic transparent support, a magnetic layer, and a conductive intermediate layer formed between the non-magnetic transparent support and the magnetic...
5604726 Pre-format configuration of optical disks and method of data processing using the same  
The optical disk disclosed has optical memory systems for data recording and reproduction, and includes a plurality of grooves, a plurality of lands, and a plurality of pre-bits. The grooves extend...
5602824 Optical disk capable of recording information on both land and groove tracks  
An optical disk has neighboring land tracks, and groove tracks for separating the land tracks. Pits each having a predetermined depth are formed on the land tracks, and islands each having a...
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...
5600627 Optical disk and a method for recording, reproducing, and deleting information on and from the optical disk  
The method of the present invention is for recording, reproducing, and deleting information on and from an optical disk including a plurality of tracks each having M guide grooves (M is an integer...
5591501 Optical recording medium having a plurality of discrete phase change data recording points  
A phase change optical recording medium which includes 1) a substrate having a planar surface; and 2) a plurality of discrete data recording points deposited upon the substrate. The discrete data...
5592452 Optical disk with logical tracks formed thereon and optical disk drive device  
An optical disk physical has a recording region divided into zones, each zone including physical tracks adjacent to each other. An integer number of sectors are provided in each physical track. The...
5589244 Magneto-optical disc  
A magneto-optical disc has a resin substrate and a magneto-optical film. A birefringence distribution of the substrate in a static state is so set that a disc phase difference during rotation of...
5587987 Information recording method having a liquid crystal substrate  
Changes-with-time in the voltages of exposed and unexposed portions of a liquid crystal recording layer with respect to a photoconductive layer having a varying dark current value are found by...
5582891 Optical disk substrate with land planes of uniform height  
A method of making a stamper uses a photoresist disk cut by the application of a laser beam on the land planes thereof, or a stamper which is different in depth between the land plane on the...
5583840 ROM type optical recording medium with a high reflectivity and an optical head operable on ROM, write-one and rewritable disk  
An optical information handling device in which reflectivity of the conventional reproduction-only type optical disk is lowered to 60% or less and is made equal to the reflectivity of write-once...
5581539 Optical recording medium  
The disclosure describes an optical recording medium for recording, erasing and reading-out information by irradiation a laser beam, comprising: a lower dielectric protective layer, a...
5580639 Method of manufacturing magnetic patterns  
A magnetic medium comprising a substrate formed with a stepped pit and a magnetic substance buried in the stepped pit. A method of manufacturing a magnetic medium comprising the steps of forming a...
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...
5566387 Diamond shaped holographic storage regions oriented along a common radial column line for higher storage density  
A disk-based holographic storage media includes a disk fabricated from a holographic storage media. A plurality of holographic storage regions are defined within the storage media such that pages...
5559787 Polarization of a reflected light beam is changed according to the depth of pits  
An optical disk includes: information recording surface on which information is recorded by irradiating laser light, the information being readable based on the laser light reflected by the...
5559786 Information recording on a track by logical operation of the information on a neighboring track  
An optical recording medium on which information data is to be recorded and on which an n-th recording track is located at a distance from the (n-1)th recording track preceding the n-th recording...
5557600 Optical recording medium with trays located so that multiple tracks can be scanned simultaneously  
An apparatus for playback of an optical recording medium where data are recorded after combined calculation of a difference signal and a sum signal generated by detecting reference patterns and the...
5556681 Optical information recording medium  
An optical information recording medium is disclosed. The optical information recording medium has a transparent substrate having pits and lands corresponding to information signals formed therein,...
5554451 Optical data recording medium  
An optical data recording medium of the present invention includes: a substrate; a reflective material layer formed of light-reflective material, the reflective material layer being provided over...
5555537 Optical data storage system with multiple write-once phase-change recording layers  
An optical disk drive uses an optical disk with spatially separated multiple phase-change WORM recording layers. The optical disk has a light transmissive substrate onto which the laser light is...
5553049 Reproduction of digital audio data optically recorded in a motion picture film  
An apparatus for optically reproducing digital speech data recorded on a motion picture film is disclosed. The digital speech data recorded on an emulsifier surface of the motion picture film is...
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...
5548572 Spare and calibration sector management for optical WORM media  
The present invention provides efficient management of calibration and spare sectors on a banded optical write-once, read-many (WORM) disk. A portion of each band on the disk includes a user data...
5544137 Optical disc record/playback apparatus  
An optical disc record and playback apparatus is provided in which it is possible to record and play back information on erasable discs, as well as write-once discs. When a disc is first inserted...
5541909 Optical disc with phase pits and a reproducing apparatus for data recorded on the optical disc  
A masking type light control layer for decreasing its reflection factor in a high-temperature region is formed on phase pits of an optical disc, and the phase pit depth is set to a predetermined...
5539721 Reducing the recording power based on the timing of recorded synchronization signal  
A method of recording an optical disk, by irradiating a laser light onto a predetermined track of the optical disc to record information pits corresponding to an input composite signal including...
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:...
5537387 Information storage disk with display data recorded in a lead-in region and an apparatus for recording and/reproducing the disc  
An optical disc, and a disc recorder and a disc reproducer therefor, wherein in a lead-in region of the disc table of contents data indicating the record position on the disc of main data, e.g....
5526338 Method and apparatus for storage and retrieval with multilayer optical disks  
A multilayer optical disk system, which includes an optical disk unit having a number of connected optical disks. A number of light sources, such as diode lasers, are used to provide a number of...
5526341 Test disk having defect patterns uniformly distributed in recording areas  
A test disk having defect patterns uniformly arranged in recording areas is produced by a production method including: producing a stamper having a plurality of data pits in accordance with test...
5518788 Antistatic hard coat incorporating a polymer comprising pendant fluorinated groups  
An optical recording disk having an antistatic hard coat layer provided on at least one surface of the disk, wherein the hard coat layer comprises a fluorinated ionic salt; a polymer comprising a...
5516568 Optical recording medium  
There is disclosed an organic optical recording medium with high data storage density, high data rates and long data archival capabilities, useful as a medium for recording a variety of information...
5511057 Multiplane information storage system with an improved record carrier  
A reading device (6) and an optical record carrier (5) having at least two information planes (1, 2, 3). The radiation from the record carrier is converted in a detection system (15) into a...
5504734 Optical disc  
An optical disc is formed with a land and a groove, and information is recorded on one of the land and the groove. Track pitch P and the width W of the other of the land and the groove satisfy the...
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...
5499231 Optical disk drive with multiple data layer disk and system for focusing the optical beam  
An optical disk drive with a multiple data layer optical disk uses computed axial velocity values of the data layers to optimize the interlayer transition of the focused light beam. In the...
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...
5493561 Optical information recording medium and information recording and reproducing method thereof  
An optical information recording medium, wherein concave and convex shaped guide grooves narrower in width W than the spot diameter of the laser beam is formed in the face of the recording film...
5485452 Optical information recording medium  
An optical information recording medium configured to prevent signal reproduction due to intermodulation as well as to ensure a compatibility to players that involve read lights with different...
5481530 High density optical recording method and recording medium  
Disclosed herein are an optical recording method of conducting recording/reading out for information by irradiating a laser beam at a wavelength of not more than 500 nm onto a recording layer of an...
5479382 Information recording medium comprising recording layer capable of recording under-exposure to recording laser beam  
An information recording medium has a thin-film recording layer and a reflective layer that reflects a laser beam. The recording layer can be composed of an inorganic substance whose optical...
5479394 Optical recording medium, recording system and reproducing system  
An optical recording medium includes in sequence a transparent substrate, a light-reflecting layer, a transparent intermediate layer and a light-absorbing layer. The light-reflecting layer, the...
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...
5471606 Information storage and processing  
Data and directories are separated and stored on separate parts of an optical disk. Directories are on the inner tracks and data are on the outer tracks, in a first format. Data and directories are...
5463565 Data block format for software carrier and player therefor  
An optical disk format for representing several synchronized signals, e.g., multiple versions of motion pictures and multiple soundtracks. All signals are represented digitally, and the bits are...
5463614 Optical recording medium having large guide groove track pitch/meander amplitude ratio  
A writable optical disk with meandering guide grooves is so arranged that a ratio of "track pitch/meander amplitude" is not less than a certain value, for example 57, at least in an out-of-phase...
5459710 Apparatus for recording information in data sections having number of bytes which increases with increase in circumference of tracks on medium  
An information recording and reproducing method and apparatus with increased recording density of an information recording medium using the sample servo method driven with a fixed angular velocity...
5453975 Optical disc with surface coating and manufacturing method therefor  
An optical disc includes a recording film formed on one surface of a disc-shaped plastics substrate having light transmission properties, and a coating film formed on the other surface of the...
Matches 401 - 450 out of 699 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 >