| Patents for G11B 11 - Recording on, or reproducing from, the same record carrier wherein for these two operations the methods or means are covered by different main groups of groups or by different subgroups of group; Record carriers therefor (14,351) |
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| 05/08/1990 | US4924327 System and method for improving the performance of high-density data storage media |
| 05/08/1990 | US4923765 Magneto-optical recording medium |
| 05/02/1990 | EP0366369A2 Magnetooptical recording media |
| 05/02/1990 | EP0366000A2 Method and arrangement to avoid read-out errors attributed to wear in a magnetic information storage device |
| 05/02/1990 | EP0365891A1 Circuit for magnetic or magneto-optical recording of data on a recording medium |
| 05/01/1990 | US4922462 Reversible memory structure for optical reading and writing and which is capable of erasure |
| 05/01/1990 | US4922454 Magneto-optical memory medium and apparatus for writing and reading information on and from the medium |
| 04/26/1990 | DE3934887A1 Deposition of thin magnetic films with constant thickness - uses sputtering method in which substrates perform specified planetary motions |
| 04/25/1990 | EP0364631A1 Thin film of amorphous alloy |
| 04/25/1990 | EP0364528A1 Magneto-optical storage medium |
| 04/24/1990 | US4920007 Film; durability, corrosion resistance,improved reading and writing efficiency |
| 04/19/1990 | WO1990004249A1 Method of preparing thermo-magneto-optic recording elements |
| 04/18/1990 | EP0364224A1 Optical information processing method and apparatus in which malfunctioning during tracking servo pull-in is prevented |
| 04/18/1990 | EP0364212A1 Magneto-optical recording medium having a reading-out layer and a recording layer containing Cr |
| 04/18/1990 | EP0364196A2 Magneto-optical recording medium having a record layer and a readout layer each containing Cr |
| 04/18/1990 | EP0364176A2 System and method for formatting high density storage media |
| 04/18/1990 | CN1041471A Connectorless hermetic optical disk system |
| 04/18/1990 | CN1041468A Method and device for sub-micron processing surface |
| 04/17/1990 | US4918675 Magneto-optical head with separate optical paths for error and data detection |
| 04/17/1990 | US4917970 Magneto optic recording medium with silicon carbide dielectric |
| 04/17/1990 | US4917751 Method of producing double sided optical memory disks |
| 04/11/1990 | EP0363147A2 Recording and reproducing apparatus and recording and reproducing method and recording medium for the recording and reproducing method |
| 04/10/1990 | US4916680 Magnetooptic recording member having selectively-reversed erasure directions in predetermined recording areas of the record member |
| 04/10/1990 | US4916465 Binary optical signal recorder providing preheating pulse before an initial write pulse |
| 04/10/1990 | US4916300 Optically readable/writable card |
| 04/10/1990 | US4915738 Alloy target for manufacturing a magneto-optical recording medium |
| 04/10/1990 | US4915737 Rare earth and cobalt, iron or nickel; three or more intermetallic phases |
| 04/05/1990 | WO1990003643A1 Bias field switching system for magneto-optic disk drive |
| 04/05/1990 | WO1990003642A1 Connectorless hermetic optical disk system |
| 04/04/1990 | EP0361970A2 Method of magneto-optically recording/erasing information and magneto-optical information storage medium |
| 04/04/1990 | EP0361879A2 System for recording/reproducing charge latent image |
| 04/04/1990 | EP0361269A2 A disc cartridge |
| 04/04/1990 | EP0128960B1 Thermomagnetic optical recording/reproducing method |
| 04/03/1990 | US4914643 Overwriting photomagnetic recording apparatus having single light source and fixed-field generator |
| 03/28/1990 | EP0360337A2 Method of and device for sub-micron processing a surface |
| 03/28/1990 | EP0360144A2 Optical memory device and information processing apparatus |
| 03/28/1990 | CN1007381B Laser magnetic recording grafting technique and recording carrier thereof |
| 03/27/1990 | CA1266975A1 Optically recordable carrier |
| 03/22/1990 | DE3931500A1 Track positioning system for optical disc unit - has track pull in move made by one unit with following control manipulated by other unit with different bandwidths |
| 03/21/1990 | EP0359658A2 Optical base material and optical product using the same and method of manufacturing the optical base material |
| 03/21/1990 | EP0359114A2 Magneto-optical recording medium |
| 03/21/1990 | EP0358775A1 Photomagnetic recording method |
| 03/20/1990 | US4910622 Over write capable magnetooptical recording medium |
| 03/20/1990 | US4910479 Automatic gain control device for use in an optical memory device |
| 03/15/1990 | DE3931260A1 Magneto=optical disc system - has erase head and read-write head to provide write again facility |
| 03/15/1990 | DE3829430A1 Apparatus for optically writing/reading to or from optical or opto-magnetic storage media |
| 03/13/1990 | US4908809 Information-carrying medium equipment for magneto-optic reading and writing |
| 03/08/1990 | WO1990002400A1 Magnetooptical recording medium and method of producing the same |
| 03/07/1990 | EP0357419A2 Optical data recording and readout apparatus |
| 03/07/1990 | EP0164131B1 Information recording medium disc and method and apparatus for recording/reproducing information |
| 03/06/1990 | US4907211 Magneto-optical recording apparatus having an inversion signal detecting means |
| 03/06/1990 | US4907195 Method of and system for atomic scale recording of information |
| 03/06/1990 | US4906874 Analog signal switching device for use in an optical memory |
| 03/06/1990 | US4906839 Hybrid surface emitting laser and detector |
| 03/01/1990 | DE3828822A1 Recording and reproducing process for information carriers |
| 02/28/1990 | EP0356201A2 Optical recording element and driving system |
| 02/27/1990 | US4905216 Method for constructing an optical head by varying a hologram pattern |
| 02/27/1990 | US4905215 System for reading information from two storage layers of an optical disk in different manners |
| 02/27/1990 | US4904349 Methods for producing optomagnetic recording media and systems for their use |
| 02/22/1990 | WO1990001772A1 Overwrite-type magnetooptical recording medium cartridge |
| 02/22/1990 | WO1990001769A1 Overwrite type magnetooptical recording apparatus |
| 02/20/1990 | US4902584 Durability, corrosion resistance |
| 02/14/1990 | EP0354564A2 Magneto-optical memory element |
| 02/14/1990 | EP0354499A2 Information storing method |
| 02/13/1990 | US4901303 Photo-electro-magnetic disc device |
| 02/13/1990 | US4901300 Method of and apparatus for recording an information signal |
| 02/13/1990 | US4901297 Optical magnetic recording and reproducing method and apparatus capable of prolonging a recording time |
| 02/06/1990 | US4899238 Cartridge shutter actuating device in recording and/or reproducing apparatus |
| 02/06/1990 | US4898529 In an injection molding apparatus |
| 01/31/1990 | EP0352748A2 Magneto-optical recording medium and method of manufacturing the same |
| 01/31/1990 | EP0352548A2 Thermo-magnetic recording method |
| 01/31/1990 | EP0352333A1 Data recording medium |
| 01/31/1990 | CN1039319A Method of optically scanning information plane and optical record carriers and scanning apparatuses |
| 01/31/1990 | CN1039317A Magneto-optical recorder with magnetic-field modulation |
| 01/30/1990 | US4897731 Method and means for reading electronic signal patterns stored on a movable image recording surface |
| 01/30/1990 | US4897320 Protective layer composed of a mixture of a rare earth metal and a dielectric material |
| 01/24/1990 | EP0352194A1 Methods, apparatus and media for recording information |
| 01/24/1990 | EP0352125A2 A semiconductor laser driving apparatus |
| 01/24/1990 | EP0352104A2 Magneto-optical memory apparatus and optical memory apparatus |
| 01/24/1990 | EP0352099A2 An external magnetic field device for a magnetooptical information recording and reproducing apparatus |
| 01/23/1990 | CA1264852A1 Optical memory element |
| 01/17/1990 | EP0351250A2 Magneto-optic recording medium comprising Dy-Fe-Co-based alloys |
| 01/17/1990 | EP0351249A2 Magneto-optical recording apparatus |
| 01/17/1990 | EP0351191A2 Recording and/or reproducing apparatus including a cartridge loading device |
| 01/16/1990 | US4894816 Optical information recording apparatus |
| 01/16/1990 | US4894815 Optical head for reading information from a magnetooptic recording medium |
| 01/16/1990 | US4893910 Magneto-optical recording system having medium with domainless control layer |
| 01/10/1990 | EP0350336A2 Optical memory system |
| 01/10/1990 | EP0350010A2 Magneto-optical recording medium |
| 01/09/1990 | US4893299 Magneto-optic data storage technique |
| 01/09/1990 | US4893207 Magnetic writing and optical reading head for a data carrier |
| 01/09/1990 | US4892634 Method of preparing thermo-magneto-optic recording elements |
| 01/03/1990 | EP0349279A2 Arrangement of recording/reproducing apparatus |
| 01/03/1990 | EP0349271A2 Magneto-optic memory device |
| 01/03/1990 | EP0348950A2 Hybrid surface emitting laser and detector |
| 01/02/1990 | US4891816 Integrated semiconductor laser device |
| 12/28/1989 | WO1989012889A1 Magnetooptical recording apparatus |
| 12/27/1989 | EP0348216A2 Optical disc cartridge |
| 12/27/1989 | EP0348198A2 Method of magneto-optically recording and erasing information and magneto-optical information storage medium for carrying out the method |
| 12/27/1989 | EP0347882A2 Over write capable of magnetooptical recording medium |