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)
11/1990
11/20/1990US4972404 Optical disc
11/20/1990US4972403 Record carrier body with an optical servo track and optical apparatus for writing and reading information from the carrier
11/20/1990US4972402 Optical card
11/20/1990US4972401 Optically readable record carrier with track undulations for producing a synchronizing clock signal and apparatus for forming such track
11/20/1990US4972400 Optical pickup apparatus having switch for allowing positional adjustment
11/20/1990US4972399 Apparatus and method for accessing a disk characteristic data recording area of an optical disk
11/20/1990US4972398 Optical disk drive with servo loop for detecting defective disks
11/20/1990US4972397 Dithering optical data logger
11/20/1990US4972396 Multiple independently positionable recording-reading head disk system
11/20/1990US4972350 Position mode track seek servo for high capacity disk drive system
11/20/1990US4972344 Dual beam optical turntable
11/20/1990US4972075 Automatic focusing system with dual diffraction gratings and converging means
11/20/1990US4971548 Injection molding halves for disks
11/20/1990US4971414 Optical information record/read apparatus
11/20/1990CA1276722C Optical recording disc
11/18/1990CA2017059A1 Read-only optical disk
11/15/1990WO1990011601A3 Method of manufacturing an optical disc
11/15/1990DE4005658A1 Kompatibles abspielgeraet fuer bildplatten verschiedener systeme Compatible player for picture discs of various systems
11/14/1990EP0397545A1 Method and structure enabling the generation of non-linear electrooptic effects
11/14/1990EP0397541A2 Track access system for magnetooptical reading and recording apparatus
11/14/1990EP0397354A2 Device for detecting cross talk level of optically read signal
11/14/1990EP0397322A2 An actuator magnetic circuit and method therefore
11/14/1990EP0397238A1 Information recording system, and recording device and record carrier for use in such an information recording system
11/14/1990EP0397234A1 Apparatus for reading an information pattern from a record carrier and signal-processing circuit for use in such apparatus
11/14/1990EP0397126A2 Defect inspecting apparatus for disc-shaped information recording media
11/14/1990EP0396943A2 Optical storage medium and storage process
11/14/1990CN1010445B Optically readable record carrier for recording information
11/14/1990CN1010443B Data storage apparatus
11/14/1990CN1010442B Information erasing method
11/14/1990CN1010441B Optical reproduction method
11/13/1990US4970712 Method for recording data onto optical data recording cards using pits for indicating the center line positions of data arrays provided on said cards
11/13/1990US4970711 Bulk eraser for optical memory media
11/13/1990US4970710 Method and apparatus for focus and tracking in an optical disk system
11/13/1990US4970707 Optical tape apparatus with a tracking control mechanism and/or a focusing control mechanism
11/13/1990US4970021 Phthalocyanine compounds and utility thereof
11/13/1990US4969790 Apparatus on the carousel principle for the coating of substrates
11/13/1990US4969715 Device for supporting object lens in optical head
11/08/1990DE4013933A1 On-off track detection for universal disc system - is based upon comparison of signal envelope to identify track condition
11/07/1990EP0396040A2 Optical information recording medium and recording method
11/07/1990EP0395885A2 Substrate for optical recording media and molding composition therefor
11/07/1990EP0395832A2 Optical head
11/06/1990US4969143 Information recording medium including a spacing member having portions aligned with and bonded to preformatted data recording areas
11/06/1990US4969142 Reproduction of optically recorded signal
11/06/1990US4969141 Optical memory for storing and retrieving information by light exposure
11/06/1990US4969139 Optical information recording and reproducing apparatus having an improved detection system for detecting fouling of a disk or an internal optical system
11/06/1990US4969137 Optical recording and reproducing apparatus having a multi-spot positioning control mechanism
11/06/1990US4968874 Optical pickup with astigmatism correcting lens
11/06/1990US4968593 Optical information recording medium
11/01/1990WO1990013117A1 Optical reading device for an optical recording medium
11/01/1990WO1990013116A1 Optical recording/reproducing apparatus
10/1990
10/31/1990EP0395413A2 Optical recording medium
10/31/1990EP0395403A2 Optical information recording/ reproducing apparatus comprising digital servo device for performing focusing and/or tracking of optical head based on digital information
10/31/1990EP0395395A2 Roll stamper for molding substrate used for optical recording medium, process for preparing same, and process for preparing optical recording medium making use of it
10/31/1990EP0395369A2 Optical recording medium and process for production thereof
10/31/1990EP0395115A2 Information recording system
10/31/1990EP0395095A2 Metastable metal colloids and preparation
10/31/1990EP0395053A2 Optical information recording medium
10/31/1990EP0394919A2 A video disc player
10/31/1990EP0394846A2 Organic photochromic compound
10/31/1990EP0394572A1 Data storage device
10/31/1990EP0394566A1 Optical recording media
10/31/1990EP0394461A1 Optical head
10/31/1990EP0394219A1 Optical modulation and measurement process.
10/31/1990CN1046632A 光学记录介质 The optical recording medium
10/30/1990US4967417 Laser driving device provided with two reference signal sources, and optical information recording apparatus using the same device
10/30/1990US4967404 Focus/tracking servo automatic gain control for optical recording
10/30/1990US4967403 Multi-format optical disk and reading device
10/30/1990US4967286 Method and apparatus for forming a digital image on an optical recording disc
10/30/1990US4966798 Optical recording medium
10/30/1990CA1275731C Optical head having a hologram lens and polanzed for use with magnetic-opticmedium
10/30/1990CA1275730C Reading circuit in an optical disk apparatus
10/28/1990CA2014140A1 Metastable metal colloids and preparation
10/27/1990CA2014554A1 Organic photochromic compound
10/24/1990EP0394032A2 Optical pickup device
10/24/1990EP0393978A2 Optical information recording-reproducing apparatus
10/24/1990EP0393889A2 Optical system
10/24/1990EP0393885A2 Optical recording and reproducing apparatus
10/24/1990EP0393719A2 Signal reproducing apparatus for optical recording and reproducing equipment and method for the same
10/24/1990EP0393576A2 Information recording media
10/24/1990EP0393118A1 Method for reading data pages on a data surface
10/24/1990EP0221936B1 Automatic correction system for the servo-circuit of a device with optical scanning of a rotating information support
10/23/1990US4965785 Optical head including a collimator having lenses of different focal lengths
10/23/1990US4965784 Method and apparatus for bistable optical information storage for erasable optical disks
10/23/1990US4965783 Compatible polymers, and use of same for registering optically readable information
10/23/1990US4965782 Off-track bit shift compensation apparatus
10/23/1990US4965781 Data reading device having servo controlled position reset
10/23/1990US4965684 Low height disk drive
10/23/1990US4965591 Recording with polymer liquid crystal recording medium
10/23/1990US4965178 Optical recording medium
10/23/1990US4965153 Optical recording medium
10/23/1990US4965118 Adapter for reproduction of digital information; suitable for mass production
10/23/1990US4965114 Excellent stability, durability and capable of high sensitivity recording
10/23/1990US4964958 Electroless deposition of gold layer, electro-deposition of metal peel
10/23/1990US4964934 Laminating flow process
10/23/1990CA1275503C Micro mechanical actual transducer head on a slider
10/18/1990WO1990012395A1 Method and apparatus for automatic marker recording
10/18/1990WO1990012394A1 Switchover circuit for the optical-scanning device of an optical recording and/or playing device
10/17/1990EP0393001A2 Method and apparatus for operating a disk recorder
10/17/1990EP0392853A2 An apparatus for recording and reproducing information on and from an optical disk
10/17/1990EP0392852A2 An optical head
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