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)
07/1979
07/12/1979WO1979000404A1 Medium for recording by thermal deformation
07/12/1979WO1979000400A1 Automatic focusing system
07/03/1979US4160270 Tracking servo system for video disc player/recorder
07/03/1979US4160269 Apparatus for optically reading a phase-modulated optical record carrier
06/1979
06/27/1979EP0002547A1 Optical read unit for reading a moving information carrier, in particular for reading a video disc
06/26/1979CA1057399A2 Apparatus and method for reading videodisc
06/26/1979CA1057398A2 Apparatus and method for stabilizing light beam modulation of a videodisc
06/26/1979CA1057397A1 Synchronous detection tracking
06/19/1979CA1056950A1 Device for detecting focussing error in an optical reader head
06/19/1979CA1056628A1 Magnetically controllable optical beam deflection device
06/12/1979US4157931 Process for producing information carrying discs
06/05/1979US4157568 Method and apparatus for optically reproducing a rotatable record with a scanning light beam of changing size
05/1979
05/30/1979EP0002043A1 Process for the manufacture of an information carrier
05/29/1979CA1055605A1 Focusing system for videodisc player
05/22/1979CA1055157A2 Apparatus and method for storing information on and retrieving information from a videodisc
05/22/1979CA1055156A1 Apparatus for reading a disc-shaped record carrier
05/15/1979US4155041 System for reducing noise transients
05/15/1979CA1054687A1 Device for compensating for signal dropouts in an angle-modulation signal
05/08/1979US4153341 Automatic focusing apparatus
05/08/1979CA1054256A1 Frequency compensation apparatus for disc-shaped record reproduction
05/08/1979CA1053959A1 Metal film recording media for laser writing
05/01/1979US4152728 Releasable carriage drive unit for an optical disc player
05/01/1979US4152726 Record disk and method for producing the same with constant width groove
05/01/1979US4152586 Optical transducer and focusing system
04/1979
04/24/1979CA1053369A1 Optical reader utilizing semiconductor laser diode
04/17/1979US4150407 Electrically controllable carrying-arm arrangement
04/17/1979US4150399 Apparatus for reading a record carrier with an optical information structure
04/17/1979US4150398 Linear method of optically recording a video or other signal
04/17/1979CA1052907A1 Reproduction of optical sound tracks
04/17/1979CA1052906A1 Method for protecting a flexible record disc and disc so protected
04/10/1979USRE29963 Servo system for reading from a disc-shaped record carrier containing signals coded in optical form
04/10/1979CA1052469A1 Apparatus for reading a flat reflecting record carrier on which information is stored in a optically readable structure
04/03/1979CA1052005A1 Stop frame for optical playback system
03/1979
03/27/1979CA1051550A2 System for reproducing pulse time modulated waveforms stored along a diffractive track
03/27/1979CA1051549A1 Arrangement for aligning the image of an information structure on a converter
03/20/1979US4145758 Error checking method and apparatus for digital data in optical recording systems
03/13/1979US4144542 Audio-visual reproduction device
03/06/1979US4143402 System for the optical read-out by reflection of a data carrier using half beams
03/06/1979CA1050163A1 Reading head for video disc player
02/1979
02/27/1979US4142210 Rotatable record carrier and method and apparatus for producing same
02/27/1979US4142209 Disc track servo system
02/27/1979US4142208 System for automatically correcting the duty factor of the carrier wave arising from reading-out a data carrier
02/27/1979US4142107 Resist development control system
02/27/1979US4142098 Optical readout for reflective video discs
02/27/1979US4141731 Method of creating a replicating matrix
02/27/1979CA1049306A1 Optical record focus control system
02/20/1979US4140373 Dual-hologram identity card
02/20/1979CA1048842A1 Metal film recording media for laser writing
02/13/1979US4139853 Laserbeam recording
02/13/1979US4139263 Optical device for projecting a radiation beam onto a data carrier
02/13/1979CA1048644A1 Dual sound track sensor and calibration strip therefor
02/06/1979US4138741 Disc eccentricity compensating system
02/06/1979US4138663 Optical reader for information discs equipped with means for automatic access to the information
01/1979
01/30/1979CA1047644A1 Record carrier on which information is stored in an optically readable structure
01/30/1979CA1047643A1 Apparatus for reading a record carrier on which information is stored in an optically readable structure
01/30/1979CA1047642A1 Record carrier on which information is stored in an optically readable structure
01/23/1979US4136362 Optical video playback apparatus with tracking control and tbc
01/23/1979US4135721 Video disc player
01/16/1979US4135207 Apparatus for reading an optical radiation-reflecting record carrier including a narrow focus control beam
01/16/1979US4135206 Objective mount for video disc player
01/16/1979US4135083 Optical scanning device
01/16/1979CA1046636A1 Plano-concave and plano-convex lens system for deflecting read beam in optical recording system
01/16/1979CA1046318A2 Opto-electronic system for determining a deviation between the actual and the desired position of a plane in an optical imaging system
01/02/1979US4133005 Apparatus for the treatment of information in an optical form
12/1978
12/19/1978US4130898 Motion blur compensation for moving media optical data recording system
12/19/1978US4130620 Photoresist
12/19/1978US4129930 Method of manufacturing an electrically controllable pivoting mirror device
12/05/1978US4128847 Optical reading device comprising a focussing detection device
12/05/1978US4128309 Automatic optical focusing device
11/1978
11/28/1978US4127651 Isolation of uteroevacuant substances from plant extracts
11/28/1978US4127328 Apparatus for conducting secondary tests for security validation
11/21/1978US4126780 On the fly optical card reader
11/21/1978US4126726 Disc-shaped information carrier having information in the form of a beam-reflecting structure and a process for producing the same
11/21/1978US4126456 Visual image recording device
11/14/1978US4125860 Reproducer for an eraseable videodisc
11/14/1978US4125859 Videodisc play-back apparatus with variable width beam
11/14/1978US4125842 Method for laser recording using zeroth order light and heat deformable medium
11/14/1978US4125405 Colored, dichroic, birefringent glass articles produced by optical alteration of additively-colored glasses containing silver and silver halides
11/07/1978US4124868 Head control means for optical videodisc player
11/07/1978US4124784 Motion picture sound system
11/07/1978US4124672 Replication utilizing a casting process
11/07/1978US4124273 Variable vergency focussing apparatus
10/1978
10/31/1978US4123788 Magnetic information carrier with optical servo tracks and apparatus for reading and writing the same
10/31/1978US4123780 Signal noise filtration for laser beam recording system
10/31/1978US4123652 Apparatus for reading a radiation-reflecting record carrier
10/31/1978US4123147 Electrically controlled adjusting device for a light beam with digital and analog deflection control
10/31/1978US4123146 Electrically controllable pivoting mirror arrangement
10/24/1978US4122551 Optical data storage and retrieval system
10/24/1978CA1040908A1 Optical fiber deflection device
10/17/1978US4121249 Card recording and reproduction apparatus and method
10/17/1978US4120559 Method of establishing secret information
10/17/1978CA1040741A1 Device for optically scanning an information track on a rotating information carrier
10/10/1978US4119361 Multilayer identification card
10/10/1978CA1039999A1 Method of creating a replicating matrix and the matrix created thereby
10/03/1978US4118736 Method of and apparatus for controlling the optical reading of recorded information
10/03/1978US4118735 Synchronous detection tracking of video disc
10/03/1978US4118734 Optical videodisc with variable width tracks
10/03/1978US4118229 High energy recording on an acetyl acetonate
09/1978
09/26/1978CA1039402A1 Record carrier on which information is recorded in an optical structure
09/19/1978US4115809 Laser beam system for optically recording information signals on a record disc
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