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)
12/1989
12/27/1989EP0347772A1 Hole-burnable material and production thereof
12/27/1989EP0347682A2 Polycarbonates with mesogenic compounds as end groups, their preparation and their use
12/27/1989EP0347511A2 Video disc with a supplementary audio and signal track
12/27/1989CN1038368A Optical-disk storage head using coupling-spectroscopic prism
12/27/1989CA1264085A1 Optical disc record reproducing apparatus
12/26/1989US4890277 Carriage driving apparatus for a disk player
12/26/1989US4890275 Reading circuit in an optical disk apparatus
12/26/1989US4890274 Optical information recording and reproducing apparatus
12/26/1989US4890273 Optical information recording/reproducing system with variable gain servo error correction in response to detected track formats
12/26/1989US4890272 Apparatus for correcting photodetector signals in a system for retrieving information from an optical recording medium
12/26/1989US4889979 Method for extending life of optically recorded information
12/26/1989US4889757 Optical recording disk
12/26/1989US4889756 Sheet-like, multilayer, laser-optical recording material
12/26/1989US4889746 Process for manufacturing an optical recording medium
12/26/1989US4889415 Light beam deflector devices
12/20/1989EP0347183A2 Dye solution and process for the preparation of information recording medium
12/20/1989EP0347081A2 Optical head devices for use in recording and/or reproduction of information
12/20/1989EP0346979A2 Reproducing and/or recording apparatus
12/20/1989EP0346907A2 Tracking and focus actuator for a holographic optical head
12/20/1989EP0346844A2 Optical head apparatus
12/20/1989EP0346772A1 Use of a composition for preparing a near IR absorbing material, and mouldings containing this material
12/20/1989EP0346726A2 Optical recording medium
12/20/1989EP0346485A1 Aromatic polymer moldings having modified surface condition and process for their production
12/20/1989EP0346479A1 Optical head
12/19/1989US4888760 Optical head apparatus
12/19/1989US4888759 Laser optical memory system having beam combining and separating apparatus for combining and separating reading and writing laser beams
12/19/1989US4888758 Data storage using amorphous metallic storage medium
12/19/1989US4888757 Focused-spot-position detection device for optical information recording and reproducing device
12/19/1989US4888756 Optical information recording and reproducing apparatus
12/19/1989US4888755 Optical head for recording informations into a record medium and reproducing the same therefrom
12/19/1989US4888754 Arrangement for reproducing data readable by an optical scanner from tracks of a recorded medium
12/19/1989US4888753 Information recording medium capable of accurately detecting the recording and reproduction starting positions and an information recording-reproducing method and apparatus therefor
12/19/1989US4888752 Focusing and tracking servo system for controlling the projection of an optical beam on an optical disk
12/19/1989US4888751 Image information processing apparatus
12/19/1989US4888491 Device for measuring angular deviation of flat plate
12/19/1989US4888476 Optical scanning system for focussing a compact-disk player
12/19/1989US4888266 Coating substrate with diazo compound, masking, exposure to light, development of diazo layer, metallization
12/19/1989US4888260 Stepped surface relief structures
12/19/1989US4887888 Objective lens driving device
12/19/1989CA1263918A1 Optical recording coating
12/14/1989WO1989012304A1 Optical memory method and system
12/14/1989WO1989012302A1 Bistable optical storage for erasable optical disks
12/14/1989WO1989012296A1 Recordable optical disc
12/13/1989EP0346121A2 Optical pickup head having a hologram-associated objective lens and optical information processing apparatus using the same
12/13/1989EP0345786A2 System for detecting defective portions in data recording portions of optical recording medium
12/13/1989EP0345752A2 Optical information recording method and apparatus and recording medium used therefor
12/13/1989EP0345360A1 Laminate for protecting optical recording layer
12/13/1989EP0345352A1 Track-jump device for a disc device
12/13/1989EP0248859B1 Process for searching for a track on a rotating plate-like information support and circuit for performing the process
12/13/1989EP0217809B1 Polymeric dyes
12/13/1989EP0214200B1 Circuit for an audio and/or video disk playback device
12/13/1989CN1037988A Optical recording media and preparing method wherefor
12/13/1989CN1006104B Data-storage disc and playback system therefor
12/13/1989CN1006102B Method of optically recording and erasing information
12/13/1989CN1006101B Optoelectronic device
12/13/1989CN1006100B Electro-optical device
12/13/1989CN1006099B Position-sensitive radiation detector
12/12/1989US4887255 Integrated optical head
12/12/1989US4887254 Optical disk drive device for positioning a carriage to a retract position
12/12/1989US4887253 Scanning method and apparatus for performing track jump operations in disk player
12/12/1989US4887179 Substrate for rigid disk storage media and method and apparatus for making the same
12/12/1989US4886959 Optical information reproducing apparatus
12/12/1989US4886718 Device for reversible optical data storage
12/12/1989US4886717 Photochromic material, photochromic device and method for recording and erasing information
12/12/1989US4886332 Optical systems with thin film polarization rotators and method for fabricating such rotators
12/12/1989CA1263893A1 Optical memory with sampled tracking for a preformatted medium
12/06/1989EP0345232A2 Integrated optical device for magneto-optical recording and reading head
12/06/1989EP0345107A1 Multilayer protective coating for a substrate, process for protecting a substrate by the plasma deposition of such a coating, coatings obtained and their uses
12/06/1989EP0344958A1 Head driving circuit
12/06/1989EP0344891A2 Tetraazaporphin, process for producing the same, as well as optical recording media using the same and production processes thereof
12/06/1989EP0344638A2 Apparatus and method for reproducing a pattern in an annular area
12/06/1989EP0344398A2 Optical recording carrier
12/06/1989EP0344317A1 Optical data recording medium
12/05/1989US4885736 Optical recording medium with track and track number guides
12/05/1989US4885735 Information recording and reproducing apparatus with management of defective sector
12/05/1989US4885734 Diffraction grating using birefringence and optical head in which a linearly polarized beam is directed to a diffraction grating
12/05/1989US4885733 Method of, and system for, detecting an excessive loading condition of multiple disks in a video disk apparatus
12/05/1989US4885732 Optical pickup apparatus for detecting and correcting focusing and tracking errors in detected recorded signals
12/05/1989US4885458 Card-form recording medium and data recording device therefor
12/05/1989US4885228 Optical information recording medium
12/05/1989US4885134 Terbium, cobalt, and iron alloy with platinum, chromium, nickel, palladium, tantalum, or hafnium ; noncracking, high strength, uniformity, corrosion resistance
12/05/1989CA1263750A1 Preformatted information medium and optical reader device
12/05/1989CA1263749A1 Method and apparatus for focusing servo control
12/05/1989CA1263748A1 Multistage tracking system
12/05/1989CA1263747A1 Optical scanning unit with a translational- position and angular-position detection system
12/05/1989CA1263536A1 Recording elements comprising write-once thin film alloy layers
12/05/1989CA1263535A1 Optical recording card and method of producing the same
12/05/1989CA1263534A1 Recording elements comprising write-once thin film alloy layers
12/05/1989CA1263533A1 Optical information recording card using polymer blend as recording material
11/1989
11/30/1989WO1989011645A1 Defect inspection apparatus
11/30/1989WO1989011641A1 Process and device for non-intrusively, continuously and automatically taking, storing and supplying analysis samples and data for future evaluation
11/30/1989DE3908150A1 Optisches oder magnetooptisches datensystem Optical or magneto-optical data system
11/30/1989DE3817451A1 Verfahren zur speicherung und zur wiedergabe von informationen Method for storing and reproducing information
11/29/1989EP0343979A2 Object lens driving device
11/29/1989EP0343952A2 Focus error detection system for an optical recording/reproducing system
11/29/1989EP0343829A2 Card or badge for carrying data and reader therefor
11/29/1989EP0343727A1 Method of optically scanning an information plane and optical record carriers and scanning apparatuses suitable for use of said method
11/29/1989EP0343688A2 Optical element, optical system and rotary encoder with the optical element
11/29/1989EP0215867B1 Circuit arrangement for a playback device for audio or video discs
11/28/1989US4884260 Data recording system for optical memory tape
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