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)
04/1989
04/18/1989CA1252888A1 Optical reader for printed bit-encoded data and method of reading same
04/18/1989CA1252887A1 Magnetooptical storage element
04/18/1989CA1252886A1 Optical data storage medium comprising a chromophore/polymer information layer
04/13/1989DE3732996A1 Apparatus for reproducing data
04/13/1989DE3732336A1 Devices for the open-loop and closed-loop controlling of signals and information which are created, transmitted and/or reproduced by electrical means, electronic means and/or laser
04/12/1989EP0311591A2 Optical record cards
04/12/1989EP0311463A2 An optical information reproducing apparatus
04/12/1989EP0311372A2 Optical apparatus for optical information recording medium
04/12/1989EP0311340A2 Optical pickup head
04/12/1989EP0311314A2 Optical information recording medium
04/12/1989EP0310812A1 Method for reducing noise in a data signal and optical pick-up device
04/12/1989EP0310795A1 Optical pick-up device and method for an optical pick-up device
04/12/1989EP0310711A1 Optical device with phase-locked diodelaser array
04/11/1989US4821254 Information recording and reproducing apparatus which detects deterioration of a medium in each sector before recording
04/11/1989US4821252 Information recording and/or reproducing apparatus
04/11/1989US4821251 Method and apparatus for recording or reproducing information in or from only a sector of an optical disk track without any defect by shifting a light beam to an adjacent track before a defective sector
04/11/1989US4821250 Process and apparatus for the recording of an information signal
04/11/1989US4821050 Optical information recording medium
04/11/1989US4820940 Control circuits operating with pulse-width modulated signals
04/11/1989US4820913 Multiple card recording system
04/11/1989US4820394 Phase changeable material
04/06/1989WO1989003111A1 Preparation of thin layers of iron iii oxide for optical and/or magnetic recording
04/06/1989WO1989003110A1 Preparation of thin layers of iron iii oxide for optical and/or magnetic recording
04/06/1989WO1989002819A1 Installation for in-line lacquering of compact disks
04/05/1989EP0310412A2 Improvements in photo-masks
04/05/1989EP0310397A2 Information recording medium having a glass substrate
04/05/1989EP0310344A2 Optical recording medium
04/05/1989EP0310307A2 Current voltage converter circuit
04/05/1989EP0310230A2 Low power optoelectronic device and method
04/05/1989EP0310162A1 Information recording and/or read system and recording and/or read apparatus for use such a system
04/05/1989EP0310156A1 Optical disc player
04/05/1989EP0310059A2 Optical information recording medium
04/05/1989EP0310027A2 Metal-containing indoaniline compound and optical recording medium employing the compound
04/05/1989EP0309721A1 Optical-recording medium
04/05/1989EP0309719A1 Apparatus for the reproduction of data
04/05/1989EP0309705A1 Method and apparatus for compensating the off-set voltage of a controlling amplifier
04/05/1989EP0309704A1 Data reproduction device
04/05/1989EP0309689A2 Optical pickup and hologram therefor
04/05/1989EP0309675A1 Noise damping method for an optical pick-up device
04/05/1989EP0309639A2 A method of automatically evaluating the quality of an audio-video program recorded on a recording medium
04/05/1989CN1032255A Information recording disc and its manufacture technique
04/05/1989CN1032248A Apparatus for optically scanning radiation reflective information plane
04/04/1989US4819242 Semiconductor laser driver circuit
04/04/1989US4819241 Precooled pouch
04/04/1989US4819240 Light modulator
04/04/1989US4819223 Video record disc
04/04/1989US4819220 Optical information recording and reproducing apparatus
04/04/1989US4819219 Track jump control system for optical disk apparatus
04/04/1989US4819218 Quasi-constant linear-velocity disk having corresponding radii of adjacent annular zones related by a rational number for distributing prerecorded indicia to form a coherent write clock signal
04/04/1989US4819210 Optical information writing method
04/04/1989US4819206 Optical recording system
04/04/1989US4819109 Slidable carriage mount for disc memory apparatus
04/04/1989US4818852 Wallet size
04/04/1989US4818666 Composed of antimony, gallium or indium, and metal or chalcogenide
04/04/1989US4818665 Medium and process for image formation
04/04/1989US4818648 Optical memory element
04/04/1989US4818069 Recording and/or reading information
04/04/1989US4818066 Objective lens driving device
03/1989
03/29/1989EP0308981A2 An optical information recording medium and its production
03/28/1989US4817098 Semiconductor laser driver system
03/28/1989US4817097 Method of and device for pulse-mode driving a semi-conductor laser
03/28/1989US4817078 Cleaning apparatus for a pick up lens of compact disc player using a front loading base
03/28/1989US4817077 Devices for detecting defects of disc-shaped record media
03/28/1989US4817076 Electro-optical scanning device having bridge members through tracking coils
03/28/1989US4817074 Method and apparatus for detecting the focusing state and positioning accuracy of a light beam directed onto an optical disk tracking guide in an optical recording system
03/28/1989US4817073 Tracking servo system for an information recording disc player
03/28/1989US4817072 Optical head utilizing diffraction grating
03/28/1989US4817069 Tracking control system of an optical pick-up
03/28/1989US4817068 Optical disk and optical disk apparatus with pause mode protection feature
03/28/1989US4817067 Optical recording medium
03/28/1989US4816841 Optical recording medium
03/28/1989US4816840 Substrate, thin film containing a fluoride compound, and electromagnetic radiation absorber
03/28/1989US4816665 Sensor array for focus detection
03/28/1989US4816660 For reading symbols
03/28/1989US4816386 Near-infrared sensitive phthalocyanine-polymer compositions
03/28/1989US4816385 On disk, crystalline indium or gallium, antimonium, tellurium alloy
03/28/1989US4816362 Multilayer, light sensitive element
03/28/1989US4816287 Between metal coated substrate and dielectric film
03/23/1989WO1989002644A1 Least squares method and apparatus for determining track eccentricity of a disk
03/22/1989EP0308104A2 Mold for molding of substrate for information recording medium and method for preparing substrate for information recording medium
03/22/1989EP0308022A1 Apparatus for optically scanning a radiation-reflective information plane
03/22/1989EP0307982A1 Apparatus for reading an optically readable record carrier
03/22/1989EP0307750A1 Use of a storage meedium in a method of recording information
03/21/1989US4815067 Optical rotary headwheel tape recording system
03/21/1989US4815064 Differential track recording
03/21/1989US4815062 Write-once data writing system for optical recording medium
03/21/1989US4815060 Optical pickup device with tracking and focusing utilizing a photodetector having four regions
03/21/1989US4815059 Laser beam collimating device
03/21/1989US4815058 Optical information processing apparatus
03/21/1989US4814925 Sealed cassette containing recording carrier tape
03/21/1989US4814907 Method and apparatus for maintaining constant flying height via magnetic interaction
03/21/1989US4814903 Alternate storage areas in magnetooptical media
03/21/1989US4814594 Updatable micrographic pocket data card
03/21/1989US4814257 Optical coating composition
03/21/1989US4814256 Optical recording material
03/21/1989US4814238 Magneto-optical recording medium
03/21/1989US4814047 Digital audio disks
03/21/1989CA1251573A1 Signal selecting circuit
03/21/1989CA1251561A1 Optical information recording medium and apparatus for recording/reproducing information using the same
03/16/1989DE3824719A1 Apparatus for recording and reproducing information
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