Matches 551 - 600 out of 699 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 >
Match Document Document Title
5031162 Magneto-optical recorded medium with a transparent substrate layer  
An optically-recorded medium in which a reflecting optomagnetic layer is applied to a transparent substrate layer. The recorded medium stores data magnetically and by pits. The magnetically stored...
5028467 Dithiolate metal complex compound, production method of the same, and optical information recording medium comprising the same  
A dithiolate metal complex compound having formula [I] ##STR1## wherein each R individually represents an alkyl group having 1 to 6 carbon atoms, a halogen, a halogenated alkyl group having 1 to 6...
5019487 Method of manufacturing a metal matrix and a master disc suitable for the manufacture of matrices  
A master disc which is provided on one side with a reflective optical structure and a recording double-layer is exposed to a first laser beam which scans the optical structure and to a second laser...
5017414 Method for manufacturing a second surface optical storage device  
A method for large scale and economical manufacture of a second surface optical recording disk is disclosed. An optically transparent disk cover with tracking grooves and data etched on a mating...
5013594 Optical information recording medium and its production  
There is disclosed an optical information recording medium comprising forming at least a recording or reflecting film on one surface of a substrate, wherein an plasma-polymerized film of a...
5001699 Recording method and apparatus  
An optical storage medium is disclosed. In general, the storage medium includes a substrate, with a first, expansion layer, a second, reflective layer bonded to the first layer, and a third,...
4998239 Optical information recording medium containing a metal alloy as a reflective material  
An optical memory storage media is described, e.g. a compact disc. A method of preparing the media (e.g. discs) is also taught. The storage media is formed from a substrate material having tightly...
4996682 Optical information medium having paired wobble pitts with continuous groove therebetween  
The present invention relates to an optical information medium for recording and reproducing information optically. Particularly, it is concerned with a so-called sample servo type optical...
4984231 Optical information phase change recording medium having double protective layer  
An optical information recording carrier which comprises an information recording film susceptible to a change in atomic arrangement upon exposure to a recording beam, a first transparent film for...
4980262 Producing a replicate video disc by a method of photographic contact printing  
A photographic contact printing process is disclosed having application in the mass production of replicate video discs from a master disc, and other applications wherein it is desired to replicate...
4980881 Optical information carrier having buffer spaces for maintaining its flat shape  
Optical information carrier comprising an optically transparent layer and a reflective layer adjacent to each other whereby the interface comprises an optically readable information structure...
4975310 Substrate for information recording medium and production method thereof  
A substrate for an information recording medium having an uneven preformat on its face side and a specular surface on its rear side is characterized by having a degree of crosslinking which is...
4972402 Optical card  
An optical card has a track portion and a track groove portion as the guide groove on a substrate which can be irradiated with coherent light in shape of a spot to detect the tracking signal from...
4972403 Record carrier body with an optical servo track and optical apparatus for writing and reading information from the carrier  
Disclosed is a system for optically recording information on a disc-shaped record carrier body along an information track, with the write spot being accurately guided in the radial and tangential...
4969141 Optical memory for storing and retrieving information by light exposure  
An optical disc memory for optically storing and retrieving information formed of a substrate and a recording layer supported on the substrate. The recording layer has a chemically stable...
4965114 Optical recording medium  
An optical recording medium of a substrate and a thin metal film laminated thereon formed of a noble metal (A), a chalcogen (B) and bismuth (C) as essential components in amounts within the region...
4964934 Optical disk manufacturing process  
A process for manufacture of a second surface optically recordable disk is disclosed. A reflective sheet of aluminum, flow process produced by precipitation of a layer of aluminum from gasified...
4962493 Record carrier with a follow-on track and apparatus for recording information thereon  
An apparatus for recording information on a disk-shaped record carrier body by a beam of radiation. The carrier body comprises a diffractive follow-on track which is capable of being scanned with...
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...
4954380 Optical recording medium and process for production thereof  
An optical recording medium comprises an optical recording layer on a transparent substrate. The optical recording layer is then selectively irradiated with an energy beam to form therein a...
4954841 Optical recording medium and method of manufacturing the same  
An optical recording medium and methods of manufacturing the same are disclosed. The optical recording medium is provided with a transparent adhesive layer containing organic compounds such as...
4952787 Method and apparatus for detecting focus error using pits and light beams having astigmatism  
A light beam which is to be focused onto a recording medium is provided with astigmatism. By focusing the light beam having tghe astigmatism with a focusing lens, two orthogonal focal lines having...
4949330 Apparatus for pre-forming servo-track portions and sector addresses having the same predetermined width  
Apparatus is described for pre-forming a relief structure of optically detectable servo-track portions and sector addresses on the recording layer of a record-carrier body, the maximum transverse...
4949329 Method of effecting erasure of optical information media including varying duty cycle, laser power and focus offset  
Provided is a process for the erasure of information recorded in an optical information medium. The erasure is effected by irradiating the medium with a laser beam, with the duty cycle, laser power...
4947384 Optical disk having narrow and wide guide grooves  
An optical disk of the type including guide grooves is improved by regulating the width of the grooves, and thus the width of the adjacent land portion, in accordance with the type of information...
4937810 Optical recording tape with continuous prerecorded tracks  
An optical recording medium in tape form which may either be strips of tape or reels of tape, all having preformatted continuous servo tracks from one end to the other. Preformatted servo tracks...
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...
4918661 Optical disk  
An optical disk and an apparatus for recording/reproducing on the disk. The disk has extra tracks that are used for tracing by the pickup when the apparatus is started or remains in a pause mode...
4910725 Optical recording method for data cards  
A method of recording data on a card in which track indicia are laser recorded by a user on at least one end of a card prerecorded with tracks only. Track indicia include start and stop marks...
4907216 Optical record carrier having position indentifying track modulation  
A system for recording and/or reading an information signal (V i ) on an elongated track (4) of an optically readable record carrier (1). A position-identifying signal (V p ) which is synchronous...
4893297 Disc-shaped member  
A transparent record disc is provided which may appropriately have video signals optically recorded thereon, the record is composed of a lamination, for example, of pliant transparent plastic on a...
4888266 Process for producing information supports capable of being optically read by variations in absorption  
The invention relates to a process for producing supports intended for the optical recording and reading of information. A layer containing a diazo compound is deposited onto a metallized...
4885736 Optical recording medium with track and track number guides  
An optical recording medium having a plurality of tracks juxtaposed each other and capable of easily and rapidly detecting a desired track. An optical recording medium includes a data recording...
4881214 Data record formatting system and reading/writing system for optical recording medium  
A data record formatting system for an optical recording medium in which the reading and/or writing is carried out along tracking lines, and a data reading/writing system for the optical recording...
4879691 Optical recording system with optical recording medium having multilevel recording surface for tracking  
An optical recording medium which has data tracks and tracking lines juxtaposed with each other in a data recording region so as to write/read data into/from the data tracks, using the tracking...
4872156 Record carrier with a preformed information track for recording information with a radiation beam  
A record carrier is described for optically writing and reading information, which record carrier is provided with a pre-formed track. This track is formed by a ridge disposedon the substrate...
4872154 Method for recording indicia for indicating presence or absence of error in medium after error checking and apparatus therefor  
There is disclosed an information record method comprising the steps of recording information in one record area of an information record medium having a plurality of record areas, reproducing the...
4866686 Optical record carrier and apparatus for reading the record carrier  
The recording surface of an optical record carrier (1) is divided into a succession of first (A) and second (B) annular zones, each including a plurality of substantially concentric information...
4861699 Method of making a master disk used in making optical readable information disks  
A method of manufacturing an optical master disk, matrix derived from the master disk and synthetic resin information disk derived from the matrix. A method of manufacturing an optical master disk...
4860273 Method of recording information and information recording medium employed for the same  
A method of recording information comprising the steps of: irradiating a light-absorbing material (which is arranged in contact with a polymer blend which changes in its phase condition between a...
4855984 Method of making and pretesting a digital recording medium  
A digital recording medium formed of a thermoplastic substrate having rows of equally-spaced microscopic optically-alterable mirrors each supported by a mesa projecting from one surface. The medium...
4842381 Electrochromic data recording systems  
An electrochromic data recording device such as a disc including at least one electrochromic zone (4) in and as a part of an electrical cell (2, 4, 5, 6, 7) for selectively supplying and...
4842824 Optical storage medium  
An optical storage medium comprises a thermoplastic resin substrate having a concave and convex surface grating on one surface thereof, and a metal layer covering the concave and convex surface...
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...
4830465 Irreversible optical recording media and fabrication thereof  
Irreversible optical recording media record information through local alteration of the optical properties of a recording layer on exposure to light.
4829509 Optical recording medium, its preparation and its use as a read only memory information carrier  
An optical recording medium containing a storage layer and, if required, one or two substrate layers, the storage layer containing graphite as the storage material, a process for the production of...
4811326 Method of recording digital information on an array of equally spaced micromirrors  
A method of recording digital information on a thermoplastic substrate having an array of equally-spaced microscopic optically-alterable mirrors each supported by a mesa projecting from one surface...
4783776 Method of recording and reproducing digital information and apparatus therefor  
A digital information recording and reproducing method for significantly improving the transfer rate of digital information, comprises the steps of: forming a plurality of light beam guide tracks...
4782477 Optical recording medium with fluorine resin adhesive  
A magneto-optical recording disk has a transparent resinous substrate with a pre-groove, and a metallic recording layer formed above the substrate. A transparent adhesive layer is provided between...
4761775 Optical disc using tracking and clocking prepits and address prepits between adjacent ones of the tracking and clocking prepits, and an optical apparatus using such a disc  
An optical disc and an apparatus using it. Prepits are preformed on a surface of the disc at a pitch to facilitate tracking thereof. The prepits are used for both tracking and clock generation. A...
Matches 551 - 600 out of 699 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 >