| 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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| 03/05/1991 | US4998231 Magneto-optical disk recording apparatus |
| 03/01/1991 | CA2022407A1 Scanning tunneling microscope memory utilizing optical fluorescence of substrate for reading |
| 03/01/1991 | CA2021582A1 Scanning tunneling microscope utilizing optical fluorescent for reading |
| 02/28/1991 | DE3927885A1 Read=out head for imaging and recording system - has double refractive elements in light path which form set with light inlet and outlet face, and beam divider |
| 02/27/1991 | EP0414557A2 Optical disk recording/reproducing device |
| 02/27/1991 | EP0414518A2 Optical recording medium and method of and apparatus for recording and reproducing information therein |
| 02/27/1991 | EP0414516A2 Optical recording medium |
| 02/27/1991 | EP0414456A2 Magnetic head position control system |
| 02/27/1991 | EP0414440A2 Magneto-optic head |
| 02/27/1991 | EP0414380A2 Optical recording and reproducing apparatus |
| 02/26/1991 | WO1991003046A1 Optical recording medium, data recording method and data reproducing method |
| 02/26/1991 | WO1991003045A1 Optical recording medium and information recording apparatus |
| 02/26/1991 | US4996678 Apparatus for rewriting an optical disc while updating its table of contents and without leaving gaps |
| 02/26/1991 | US4995923 Containing at least one transition element and one rare earth element; resistant to oxidation; high reflectance |
| 02/26/1991 | CA2023961A1 Optical recording medium |
| 02/19/1991 | US4995024 Magneto-optical recording element |
| 02/19/1991 | US4994330 Transparent substrates, lathanide, transition metal alloy, and corrosion resistance layer |
| 02/12/1991 | US4993012 Record face identifying device for magneto-optic record medium |
| 02/12/1991 | US4993011 Optical recording apparatus with simultaneous erasing and recording |
| 02/12/1991 | US4993009 Opto-magnetic recording apparatus with a bias magnetic field generating means movable parallel to a recording surface of a recording medium |
| 02/12/1991 | US4992896 Cartridge shutter actuating device in recording and/or reproducing apparatus |
| 02/12/1991 | US4992338 Disks having direct-overwrite capabilities |
| 02/12/1991 | US4992336 Substrate with layers of laminated thin films of rare earth metals and transition metals of specific structure; large capacity data file |
| 02/12/1991 | US4992095 Containing rare earth elements |
| 02/12/1991 | CA1280207C Device for producing a high frequency modulation magnetic field usedin magneto-optical recording |
| 02/07/1991 | WO1991001553A1 Magneto-optical recording and/or reproducing device |
| 02/07/1991 | WO1991001552A1 Cooling body for an element to be cooled |
| 02/07/1991 | WO1991001489A1 Optical devices |
| 02/06/1991 | EP0411860A2 Direct-overwrite magneto-optic media |
| 02/06/1991 | EP0411783A2 Magneto-optical pickup apparatus and magneto-optical recording/reproducing apparatus |
| 02/06/1991 | EP0411120A1 Laser reproduction apparatus |
| 02/05/1991 | US4991160 Integrated optical device for magneto-optical recording and reading head |
| 02/05/1991 | US4991158 Optical information recording and reproducing apparatus |
| 02/05/1991 | US4990208 Multilayer; adhesive applied in ring pattern |
| 02/01/1991 | CA2019721A1 Direct-overwrite magneto-optic media |
| 01/30/1991 | EP0410804A2 Rotary head device |
| 01/30/1991 | EP0410575A2 Magneto optic recording medium with hydrogenated silicon carbide dielectric |
| 01/30/1991 | EP0410337A2 Protection coatings made of germanium ceramics |
| 01/30/1991 | EP0409848A1 Data storage system |
| 01/29/1991 | US4989198 Beam control device utilizing beam having a specific direction of polarization to control a laser used in an optical memory system |
| 01/29/1991 | US4989189 Magneto-optic playback apparatus including astigmatic diffracting means |
| 01/28/1991 | CA2019720A1 Magneto optic recording medium with hydrogenated silicon carbide dielectric |
| 01/24/1991 | DE4023202A1 Defective ferrite spinel magnetic material - heat treated to optimise and stabilise magnetic or magneto=optical properties |
| 01/24/1991 | DE3923331A1 Optical disc scanning arrangement - uses main scanning beam and two tracking beams displaced by half track width |
| 01/24/1991 | DE3923329A1 Optical disc scanning arrangement - uses half wavelength plate rotated to reduce unwanted polarisation effects |
| 01/24/1991 | DE3923328A1 Magneto-optisches aufnahme- und/oder wiedergabegeraet A magneto-optical recording and / or wiedergabegeraet |
| 01/23/1991 | EP0409649A2 Information recording and reproducing device |
| 01/23/1991 | EP0408763A1 Optical disk and method of manufacturing the same |
| 01/23/1991 | CN1048763A Dissipator for cooling elements |
| 01/23/1991 | CN1048762A Magneto-optical recording and/or reproducing-set |
| 01/22/1991 | US4986938 Compression of injection molded polycarbonate before solidification of interior |
| 01/15/1991 | US4985885 Optical memory device |
| 01/15/1991 | US4985881 Record carrier for a magneto-optical disc memory having guide grooves of a plurality of tracks disposed with a predetermined relation to light spot diameter |
| 01/15/1991 | US4985880 Optical information recording and reproducing apparatus |
| 01/15/1991 | US4984901 Magnetic recording disc having sector reference zone, device for reading same, and magnetooptical memory optoelectronic employing said device |
| 01/09/1991 | EP0407329A1 Method of optically recording data, and semiconductor devices particularly useful therein |
| 01/09/1991 | EP0407191A2 Magneto-optical recording medium and apparatus |
| 01/09/1991 | EP0407051A2 Disc loading apparatus |
| 01/09/1991 | EP0406823A2 Magnetooptical recording media |
| 01/09/1991 | EP0406569A2 Optical recording medium |
| 01/08/1991 | US4984226 Magnetoptic head for recording/erasing information using a cylindrical hollow permanent magnet |
| 01/08/1991 | US4984225 System for applying magnetic field to opto-magnetic memory |
| 01/08/1991 | US4984224 Apparatus for recording and/or erasing an information signal on and from a magneto-optical disk wherein the magnetic biasing field means is part of a rotor magnet included in a stepping motor |
| 01/08/1991 | US4983505 Optical recording medium |
| 01/08/1991 | US4983025 Magneto-optical thin film |
| 01/08/1991 | CA1278860C Optical head in an optical memory device |
| 01/06/1991 | CA2020374A1 Magnetooptical recording media |
| 01/02/1991 | EP0406023A2 Opto-magnetic recording medium |
| 01/02/1991 | EP0406021A2 Disk recording and reproducing device |
| 01/02/1991 | EP0405742A2 Method for increasing linear bit density in magneto-optical storage media |
| 01/02/1991 | EP0405741A2 Method for increasing track density of magneto-optical storage media |
| 01/02/1991 | EP0405604A2 Magnetic optical recording/reproducing apparatus |
| 01/02/1991 | EP0405444A2 Optical head |
| 01/01/1991 | US4982396 Information recording medium and apparatus using reversible phase change |
| 01/01/1991 | US4982389 Magneto-optical recorder with compensation for variation in applied magnetic field intensity on a recording medium |
| 12/29/1990 | CA2015900A1 Method for increasing track density of magneto-optical storage media |
| 12/29/1990 | CA2015899A1 Method for increasing linear bit density in magneto-optical storage media |
| 12/27/1990 | EP0404333A2 Low friction macromolecular materials for coating disk and head surfaces |
| 12/25/1990 | US4980877 Optical recording and reproducing system with high track density and low cross-talk |
| 12/25/1990 | US4980875 Magneto-optical disk with perpendicular magnetic anisotropy film and high corrosion-resistant film |
| 12/25/1990 | US4980198 Laser CVD and plasma CVD of CrO2 films and cobalt doped CrO2 films using organometallic precursors |
| 12/20/1990 | DE4017999A1 Magneto=optical recording material - has multilayer construction of magnetic and optical material |
| 12/19/1990 | EP0403266A2 Magneto-optical recording and/or reproducting apparatus |
| 12/18/1990 | US4979158 Bias magnetic field abnormality detecting apparatus which controls recording and erasing of information |
| 12/18/1990 | US4978584 Magneto-optical storage medium |
| 12/12/1990 | EP0402071A2 Signal processing circuit for magnetooptical record/reproducing apparatus |
| 12/12/1990 | EP0401973A2 Reliable track crossing detection in data storage apparatus |
| 12/12/1990 | EP0401791A2 Information storage method |
| 12/12/1990 | CN1047751A Circuit of command of modulation of magnetic field or enregistering of magnet-optical |
| 12/12/1990 | CN1047750A Method and apparatus for recording signals on a record carrier, measurement method and measurement device for use in the recording method and the recording apparatus, and record carrier |
| 12/12/1990 | CN1047749A Recording medium, recording and reproducing device and recording method |
| 12/11/1990 | US4977552 Split type optical pick-up device with a tracking error detector on the moving part |
| 12/11/1990 | US4977549 Write and erase magnetic bias field switching system for a magneto-optic disk drive |
| 12/11/1990 | US4977019 Magnetooptical recording medium bonded with a flexible foam adhesive |
| 12/11/1990 | CA1277767C Optical recording apparatus |
| 12/05/1990 | EP0401041A2 Recording medium, recording and reproducing device and recording process |
| 12/05/1990 | EP0400927A2 Recording and reproducing apparatus using opto-magneto media |
| 12/05/1990 | EP0400726A1 Method and apparatus for recording signals on a record carrier, measurement method and measurement device for use in the recording method and the recording apparatus, and record carrier |
| 12/05/1990 | CN1047585A 信息记录介质 The information recording medium |
| 12/04/1990 | US4975898 Method and apparatus for preventing copying of an optical disk |