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)
08/1990
08/21/1990US4950876 Optical card recording/reproducing apparatus with compensation for displacement deviation between data area of optical card and laser beam
08/21/1990US4950754 Chromogenic dicyanomethylenepyrazolinones
08/21/1990US4950731 Reacting phosgene with spirobiindane bisphenol in heterogeneous base; adding interfacial polymerization catalyst
08/21/1990US4950716 Compatible polycarbonate/methyl-meth-acrylate polymer mixtures
08/21/1990US4950579 Optical disc recording medium having a microstructure-derived inhomogeneity or anisotropy
08/21/1990US4950547 Bariumand strontium titinates and their nitrides; coatings
08/21/1990US4950520 Optical recording medium and method manufacturing thereof
08/20/1990CA2010338A1 Method of producing a multiple layer identification card, an apparatus for practicing such method and an identification card
08/16/1990EP0382553A1 Apparatus for driving objective lens
08/16/1990EP0382528A1 Optical disk
08/16/1990EP0382477A1 Resin having a high refractive index
08/16/1990EP0382425A1 Optical recording medium
08/16/1990EP0382420A2 Microstructure-bearing composite plastic articles and method of making
08/16/1990EP0382280A1 Apparatus for scanning a disc-type information carrier
08/16/1990EP0382154A2 Optical disc recording system
08/16/1990EP0381768A1 Laser diode driving apparatus
08/16/1990DE4003962A1 Optisches system eines geraetes zur aufzeichnung und wiedergabe optischer informationen The optical system of an apparatus for recording and reproduction of optical information
08/15/1990CA2009706A1 Objective lens moving apparatus
08/14/1990US4949332 Optical record carrier having contrast enhancing information and servo-tracks
08/14/1990US4949331 Apparatus and record carrier for optical disc memory with correction pattern and master disc cutting apparatus
08/14/1990US4949330 Apparatus for pre-forming servo-track portions and sector addresses having the same predetermined width
08/14/1990US4949329 Method of effecting erasure of optical information media including varying duty cycle, laser power and focus offset
08/14/1990US4949311 Single laser direct read after write system (draw)
08/14/1990US4948984 Optical scanning head with objective position measuring and mirrors
08/14/1990US4948715 Polymeric polymethine dyes and optical data storage media containing same
08/14/1990US4948703 Ultraviolet light curable composition and use thereof
08/14/1990US4948230 Objective lens driving apparatus
08/14/1990CA1272845A1 Recording disks and process
08/14/1990CA1272803A1 Apparatus for reading information from a record carrier
08/14/1990CA1272666A1 Multilayered article including crystallization inhibiting layer and method for fabricating same
08/08/1990EP0381492A2 Optical recording medium, optical recording method, and optical recording device used in method
08/08/1990EP0381443A2 Focus detection apparatus
08/08/1990EP0381394A1 Tracking error detecting apparatus and optical disc recording and/or apparatus including the same
08/08/1990EP0381212A2 Electrostatic-type multidimensional actuator
08/08/1990EP0381211A2 Optical recording media
08/08/1990EP0381210A2 Optical recording media and process for preparing same
08/08/1990EP0381150A2 Video disk player
08/08/1990EP0381099A2 Optical information reading system for reading information on mass-production information medium
08/08/1990EP0380746A2 Recording medium playing apparatus
08/08/1990EP0380532A1 Preparation of thin layers of iron iii oxide for optical and/or magnetic recording.
08/07/1990US4947481 Information reader for disk player
08/07/1990US4947384 Optical disk having narrow and wide guide grooves
08/07/1990US4947383 Machine readable markers for cartesian information storage media
08/07/1990US4947372 Optical information memory medium for recording and erasing information
08/07/1990US4947367 System for converting digital data from magnetic tape format apparatus and method for converting a sequentially accessible magnetic tape data format to directly accessible write-once disk data format to worm optical disk format
08/07/1990US4947273 Autoloading, interchangeable-media, disk-drive apparatus
08/07/1990US4947093 Shock resistant winchester disk drive
08/07/1990US4946762 Thermally alterable recording layers; improved laser optics
08/07/1990US4946730 Method of and photomask for manufacturing optical memory element
08/07/1990US4946724 Lead,tin,phosphorus,fluorine,oxygen containing glass
08/07/1990US4946261 Recording method and recording apparatus
08/03/1990CA2045165A1 Erasable optical information storage system
08/01/1990EP0380323A1 Optically writable record of digital information and recording apparatus therefor
08/01/1990EP0380320A2 An optical pickup apparatus
08/01/1990EP0380073A2 Layered material
08/01/1990EP0380002A2 Optical disk substrate and optical information-storage medium
08/01/1990EP0379585A1 Recordable optical disc
08/01/1990EP0293493B1 Optical-mechanical memorizing device
08/01/1990EP0227530B1 Method for recording with updating and for the reproduction of data on a non-erasable sectorial record carrier
08/01/1990EP0160095B1 Tracking servo circuit for optical disk
08/01/1990CN1044358A Optical scanning apparatus
08/01/1990CN1009035B Optical disc driving device
08/01/1990CA2008998A1 Optical recording media and process for preparing same
08/01/1990CA2008997A1 Optical recording media
07/1990
07/31/1990US4945529 Optical head comprising a diffraction grating for directing two or more diffracted beams to optical detectors
07/31/1990US4945527 Optical pickup apparatus for detection of focusing error, tracking error, and information
07/31/1990US4945526 Actuator assembly for optical disk systems
07/31/1990US4945525 Optical information processing apparatus
07/31/1990US4945524 Compact optical pickup apparatus for optical disk player
07/31/1990US4944981 Optical recording medium
07/31/1990US4944980 Optical recording material
07/31/1990US4944967 Process for the preparation of information recording medium
07/27/1990CA2008550A1 Composite structure
07/26/1990WO1990008382A1 Optical disk and method of manufacturing the same
07/26/1990WO1990008381A1 Optical scanning device
07/26/1990DE3901574A1 Optical scanning device
07/25/1990EP0379363A2 Optical head device for use in optical disk system
07/25/1990EP0379285A2 Tracking control apparatus for a recording/reproducing apparatus on or from an optical disk
07/25/1990EP0379277A2 Napthtalocyanine based compound and optical recording medium containing the same
07/25/1990EP0379276A2 Erasable optical recording medium and method for writing, reading and/or erasing thereof
07/25/1990EP0379130A1 Optical disk substrate, optical information-storage medium, and process and apparatus for manufacturing the optical disk substrate
07/25/1990EP0378913A2 Apparatus and process for measuring data disk runout and acceleration parameters
07/25/1990EP0378650A1 Process and circuit arrangement for compensating offset voltages in a focus and/or track-regulating circuit
07/25/1990CN1008952B Information reproducing and recording apparatus
07/24/1990US4944037 Optical system for recording information in erasable and non-erasable modes
07/24/1990US4943957 Magneto-optical, glass layer
07/24/1990US4943681 Phthalocyanine complex, high sensitivity, lasers
07/24/1990US4943611 Resin composition for spacers of information recording disc
07/24/1990US4943515 Radiating a substrate-supported recording layer comprising an organic solvent-soluble silver salt and a dye with a laser beam
07/24/1990US4943166 Device for detecting the position of an optical head
07/24/1990US4943131 Thin-film optical function element, and optical head using the same
07/24/1990US4943129 Tapered optical waveguide, waveguide type optical head using same and optical waveguide
07/24/1990US4943126 Replication of carriers bearing digitally recorded information
07/18/1990EP0378443A2 Method for recording and reproducing information
07/18/1990EP0378438A2 An optical pickup apparatus
07/18/1990EP0378394A2 Track counter for optical disk
07/18/1990EP0378344A2 Optical recording medium
07/18/1990EP0378336A1 Naphthalocyanine derivatives, production thereof, optical recording medium using the same, and production thereof
07/18/1990EP0378330A2 Servo circuit control system
07/18/1990EP0378222A1 Magnetic recording medium and method of magnetically recording and reading data
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