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)
05/1990
05/15/1990US4926405 High-speed search method for use in a disc player system
05/15/1990US4926403 Magneto-optic recording apparatus for recording information selectively on both sides of the recording medium
05/15/1990US4926082 Superconductor devices for disk drives
05/15/1990US4926036 Light detector
05/15/1990US4925776 Optical memory element and manufacturing method thereof
05/15/1990US4925717 Disk-shaped recording medium and disk apparatus
05/15/1990US4925589 Addition acrylic type polymer
05/15/1990US4925283 Objective lens for optical memory device
05/15/1990CA1269163A1 Photocell embedded in transparent resin body
05/14/1990CA2002744A1 Low profile voice coil actuator for use in an optical data storage device
05/10/1990DE3838012A1 Workpiece carrier
05/09/1990EP0367589A2 Optical recording media
05/09/1990EP0367588A2 Optical recording media
05/09/1990EP0367465A2 Optical pickup devices
05/09/1990EP0367300A2 Portable laser diode scanning head
05/09/1990EP0367299A2 Portable laser diode scanning head
05/09/1990EP0367298A2 Portable laser diode scanning head
05/09/1990EP0367094A2 Optical disk apparatus
05/08/1990US4924483 Track counting circuit for use in an optical disk driver
05/08/1990US4924455 Apparatus for generating tracking error signals in a differential phase detection system
05/08/1990US4924454 For the reproduction of data
05/08/1990US4924447 Optical memory device for recording, reproducing or erasing information onto a recording medium, including a recorded region detecting circuit.
05/08/1990US4924436 Data storage device having a phase change memory medium reversible by direct overwrite and method of direct overwrite
05/08/1990US4924199 Optical card for data storage for use in a data recording and retrieving apparatus
05/08/1990US4924082 Optical scanning device, mirror objective suitable for use in said device and optical write and/or read apparatus provided with said device
05/08/1990US4924079 Apparatus for optically scanning an information plane
05/08/1990US4923962 Optical disk substrate comprising aromatic polycarbonate
05/08/1990US4923390 Amine or quaternary salts used as photostabilizers with methine dyes; heat and radiation resistance; durability; optical cards and disks; lasers
05/03/1990WO1990004812A1 Hologram production
05/03/1990DE3836573A1 Apparatus for reading out information introduced into an information carrier
05/02/1990EP0366455A2 Optical recording medium and method of its production
05/02/1990EP0366440A2 Naphthalocyanine derivatives, production thereof, optical recording medium using the same, and production thereof
05/02/1990EP0366322A2 Interchangeable helical recording drum
05/02/1990EP0366000A2 Method and arrangement to avoid read-out errors attributed to wear in a magnetic information storage device
05/02/1990EP0365552A1 Optical storage disk and method of its manufacture.
05/02/1990CN1007845B Optical record carrier and apparatus for reading record carrier
05/01/1990US4922477 Optical head unit
05/01/1990US4922462 Reversible memory structure for optical reading and writing and which is capable of erasure
05/01/1990US4922351 Optical information recording and reproducing apparatus
05/01/1990US4922160 Impedance load driving circuit
05/01/1990US4921317 Infrared absorbent comprising a metal complex compound containing two thiolato bidentate ligands
05/01/1990CA1268369A1 Optical pickup device
04/1990
04/28/1990CA2001542A1 Optical recording medium and method of its production
04/26/1990DE3836250A1 Process for producing round polycarbonate plates
04/25/1990EP0365368A2 An optical pickup device
04/25/1990EP0365333A2 Optical recording element
04/25/1990EP0365070A1 Optical scanning unit, optical write and/or read apparatus comprising said unit and a method of manufacturing the scanning unit and the write and/or read apparatus
04/25/1990EP0364796A2 Moulding compositions from mixtures of polycarbonates having a higher dispersed solubility
04/25/1990EP0364586A1 Disk recording apparatus
04/25/1990CN1041662A Device for scanning record carrier and control circuit for use in such device
04/25/1990CN1007762B Sound generator for electronic musical instrument
04/24/1990US4920527 Focusing error detection apparatus
04/24/1990US4920424 Method of recording and reproducing multi-channel information on and from recording medium
04/24/1990US4920359 Optical information recording medium having protective layer
04/24/1990US4920007 Film; durability, corrosion resistance,improved reading and writing efficiency
04/24/1990US4919988 Information recording medium and process for producing the same
04/24/1990CA1268252A1 Information recording method
04/24/1990CA1268251A1 Data storage device and system
04/19/1990WO1990004252A1 Single stage seek method
04/18/1990EP0364224A1 Optical information processing method and apparatus in which malfunctioning during tracking servo pull-in is prevented
04/18/1990EP0364213A1 Method and apparatus for driving light source by stored current value and for processing information
04/18/1990EP0364120A2 A cycloalkene compound and a recording material using the compound
04/18/1990EP0364085A2 Tracking servo apparatus
04/18/1990EP0363966A2 Optical head device
04/18/1990EP0363422A1 Integrated optical read/write head and apparatus incorporating same.
04/18/1990CN1041471A Connectorless hermetic optical disk system
04/18/1990CN1041469A 光盘介质 CD media
04/18/1990CN1007669B Optical disc player
04/17/1990US4918683 Optical information medium having a base plate made of polymethylmethacrylate which is a copolymer of methyl methacrylate and methyl acrylate
04/17/1990US4918682 Deformable polymer layer
04/17/1990US4918681 Data reproducing apparatus using idling current
04/17/1990US4918680 Focus-servo correction utilizing storage of detected focus errors
04/17/1990US4918679 Optical record carrier scanning apparatus providing optoelectronic positioning of the scanning spot
04/17/1990US4918677 Information recording/reproducing apparatus including a plurality of recording or reproducing rates
04/17/1990US4918676 Track accessing apparatus for optical disk
04/17/1990US4918675 Magneto-optical head with separate optical paths for error and data detection
04/17/1990US4918661 Optical disk
04/17/1990US4918415 Data reading and/or writing apparatus for use with an optical card
04/17/1990US4918300 Optical pickup system having multiple diffraction devices and lens holding means
04/17/1990US4918217 Memory device, opto-electronic display or non-linear optical device
04/17/1990US4918160 One step, solvent-free; medical equipment, optical disks
04/17/1990US4917989 Optical recording medium which has a reflector layer containing a silicon-phthalocyanine derivative
04/17/1990US4917833 Method of manufacturing information discs from a synthetic material by an injection molding device
04/17/1990US4917751 Method of producing double sided optical memory disks
04/17/1990US4917292 Book on a pocket card
04/17/1990CA2000532A1 Hologram production
04/17/1990CA1267974A1 Optical information recording and reproducing apparatus
04/12/1990DE3932627A1 Optical disc recording and playback unit - has laser controlled by detector circuit to limit amount of light within period
04/12/1990CA2000416A1 Optical head device
04/11/1990EP0363195A2 Disc player using a servo loop with a variable transfer function
04/11/1990EP0363186A2 Method for setting a sound recording level
04/11/1990EP0363056A2 Compact disk player
04/11/1990EP0363022A2 On/off-track signal in optical information recording and/or reproducing apparatus
04/11/1990EP0362987A2 Servo device for disc player
04/11/1990EP0362938A1 Device for scanning a record carrier and control circuit for use in such a device
04/11/1990EP0362901A2 Heat sensitive film shutter
04/11/1990EP0362852A2 Information-recording thin film and method for recording and reproducing information
04/11/1990EP0362792A2 Aromatic polycarbonate copolymer and optical disk having a substrate of the same
04/11/1990EP0362669A1 Optically writable and readable disc in form of an air-sandwich
04/11/1990EP0248907B1 Photochromic material, photochromic element and method of recording and erasing data
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