Patents
Sitemap › G11 - Information storage › G11B - Information storage based on relative movement between record carrier and transducer › G11B 7 - Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
Patents for G11B 7 - Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor (102,715)
10/1981
10/20/1981US4296419 Antimony-bismuth alloy thin film
10/20/1981US4296316 Optical focusing device
10/20/1981CA1111194A1 Method of duplicating plastics information carriers, as well as a moulding resin, substrate and die used in said method
10/14/1981EP0037607A1 Optically readable information disk
10/13/1981US4295162 Reading one-dimensional line image holograms of a video from a disc with a guide track
10/13/1981CA1110763A1 Video disc player
10/07/1981EP0037073A2 Centering device to make a centre hole in discs
10/07/1981EP0036890A1 Apparatus and method for detecting crossmodulation distortion
10/06/1981US4293944 Information play-back apparatus with astigmatic auto-focusing
10/06/1981US4293634 Binders, aggregation, crystallization
10/06/1981US4293195 Simultaneous multi-beam optical modulation system
09/1981
09/29/1981US4292511 Apparatus and method for reading an identifying label on an information record
09/29/1981US4292109 Method of making laser disc memory storage article
09/29/1981CA1109961A1 Optical system
09/29/1981CA1109960A1 Apparatus for optically detecting informations recorded on a carrier
09/29/1981CA1109944A1 Safety apparatus for stopping gas leakages
09/23/1981EP0036224A1 Device for pivoting an optical element under electrodynamic control
09/23/1981EP0036222A2 Focus servo system and focussing method
09/22/1981US4291119 Recording material
09/22/1981CA1109560A1 Apparatus for reading a radiation-reflecting record carrier
09/22/1981CA1109559A1 Optical read unit for scanning a record carrier having a radiation-reflecting information structure
09/16/1981EP0035933A1 Cartridge for an optical disk
09/16/1981EP0035803A2 Disc spindle servo system
09/15/1981US4290132 Focus servo device for use in an optical information read-out device
09/15/1981US4290122 Self-synchronizing clock source for optical memories
09/15/1981US4290075 Optical recording device having several ablative recording layers
09/15/1981CA1109148A1 Optical reader for information discs equipped with means for automatic access to the information
09/09/1981EP0035289A2 Optical tracking system
09/09/1981EP0035288A2 Optical tracking method and system
09/09/1981EP0035287A2 Signal correction system and method
09/09/1981EP0035236A1 Tracking servo control device
09/08/1981US4288528 Method of making an embossed pattern on an information bearing substrate
09/08/1981US4288510 Process of making an optically recordable and readable information carrier and the carrier obtained by this process
09/03/1981WO1981002490A1 Real-time optical disc and method for record and readout
09/01/1981US4287413 Automatic focus servomechanism in optical information reading device
09/01/1981US4287316 Said composition containing a graft copolymer and a random copolymer both made from an unsaturated nitrile and other unsaturated monomers
09/01/1981US4286848 Reproducing objective lens for videodiscs
09/01/1981US4286790 Optical disc changer apparatus
08/1981
08/25/1981USRE30723 Disc phonograph record playback by laser generated diffraction pattern
08/25/1981US4286318 Control loop
08/25/1981US4286290 Fast recovery squelch circuit for a video disc player
08/25/1981US4286147 In-focus detecting device
08/25/1981US4285687 Machine for folding plastic sheet material
08/25/1981CA1107555A1 Colored dichroic, birefringent glass articles produced by optical alteration of additively-colored glasses containing silver and silver halides
08/19/1981EP0034066A2 Printer with forms overlay
08/19/1981EP0033968A2 Method for optical recording of information in a digital system
08/18/1981US4285056 Replicable optical recording medium
08/18/1981US4285015 Method and apparatus for locating a movable servo controlled member during position signal drop-out
08/18/1981US4284716 Filamentary and nonfilamentary silver particles
08/18/1981CA1107395A1 Apparatus for reading a radiation-reflecting record carrier
08/12/1981EP0033667A1 Reversible memory structure for thermo-optical recording and optical reading, and recording and erasing process for this structure
08/12/1981EP0033431A1 Permanent memory structure for thermo-optical recording and optical reading, and recording process in such a structure
08/12/1981EP0033430A1 Thermo-optical information-recording process and information carrier to carry out this process
08/11/1981US4283785 Optical information recording apparatus
08/11/1981US4283777 Optical memory having a parallel read out
08/11/1981CA1106560A1 Method of manufacturing a plastics record carrier having a stratified structure as well as a device for carrying out the method
08/06/1981WO1981002236A1 Process for making discs
08/06/1981WO1981002216A1 Process and equipment for recording and displaying laser interference images
08/06/1981WO1981002137A1 Information carrying discs
08/05/1981EP0033240A1 Optical data storage
08/05/1981EP0033052A1 Optical recording-reproducing device of record carriers and optical memory system comprising such a device
08/05/1981EP0033047A1 Mobile equipment for a video disc recording scanner and video disc recording scanner comprising such equipment
08/05/1981EP0033046A1 Method for the thermo-optical recording of data and record carrier to carry out this method
08/04/1981US4282598 Video disc read back scanner
08/04/1981US4282534 Thermal recording elements
08/04/1981CA1106496A1 Recording device for optically recording information on a carrier with a light spot and a positional control of the spot
08/04/1981CA1106493A1 System for automatically correcting the duty factor of the carrier wave arising from reading-out a data carrier
07/1981
07/28/1981CA1106061A1 Rotary recording medium with intermediate pits
07/23/1981WO1981001981A1 Manufacture of blanks for recording discs utilizing coextrusion and blanks and records made thereby
07/22/1981EP0032452A2 Manufacture of blanks for recording discs utilizing coextrusion and blanks and records made thereby
07/22/1981EP0032271A1 Apparatus for writing digital information in a disc-shaped optically readable record carrier
07/21/1981US4280215 Focussing lens servo driving device for optical information reading device
07/21/1981US4279989 Gelatin-epoxy sheet materials
07/21/1981CA1105616A1 Multiple beam optical record playback apparatus for simultaneous scan of plural data tracks
07/14/1981US4278758 Diffusion transfer
07/14/1981US4278756 Reflective data storage medium made by silver diffusion transfer
07/14/1981US4278734 Optical information recording material and method of recording and reproducing information using same material
07/07/1981US4277071 Disc records having surface markings
07/07/1981CA1104716A1 Optical disc reader having diffraction minima at non- interrogated tracks
06/1981
06/30/1981US4275960 System for enhanced light uniformity in a document scanning system
06/30/1981CA1104251A1 Rotatable record carrier and method and apparatus for producing same
06/25/1981WO1981001767A1 A method for recording signals on bands by means of laser beams and apparatus for carrying out the method
06/23/1981US4275275 Recording device for optically recording information on a carrier with a light spot and a positional control of the spot
06/23/1981US4275091 Method of duplicating plastics information carriers
06/16/1981US4274101 Laser recorder with piezoelectric bimorph focal length vibrator
06/16/1981US4273998 Servo unit for optical type information reading device
06/16/1981CA1103351A1 Binary coded digital optical record
06/16/1981CA1102973A1 Method and means for replicating centrally apertured video disc records
06/09/1981US4272651 Optical system having diode laser light source
06/09/1981US4272574 Optically readable information disc
06/03/1981EP0029755A1 Stigmatic optical device for transmission/reception of coherent radiation and an optical read/write head including such a device
06/02/1981US4271489 Optical disc player system
06/02/1981US4271334 Apparatus for correcting for temperature-induced tracking errors in a system for recovering information from a recording disc
06/02/1981US4270843 Objective for video disks
05/1981
05/26/1981US4270132 Information record
05/26/1981US4270130 Thermal deformation record device with bleachable dye
05/26/1981US4270045 Apparatus for reading an optical radiation-reflecting information carrier for controlling focus
05/26/1981US4269917 Supported colloid matrix having depth-wise gradient of silver particle concentration; laser recording; direct reading after write
05/26/1981US4269486 Multi-axis movable mirror device
05/19/1981US4268840 Optical recording member
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