| 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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| 08/29/1990 | CN1044997A Method of and apparatus for writing and reading magneto-optical record carrier |
| 08/28/1990 | US4953150 Optical recording apparatus having improved erasing capability |
| 08/28/1990 | US4953124 Opto-magnetic signal reproducing apparatus for reading, by differential detection using a magneto-optical effect, information magnetically recorded on a record medium |
| 08/28/1990 | US4952787 Method and apparatus for detecting focus error using pits and light beams having astigmatism |
| 08/28/1990 | US4952295 Sputtering plurality of targets onto substrate moving at high speed; zinc selenide and silica; recording media |
| 08/22/1990 | EP0383526A2 Magneto-optic recording system |
| 08/22/1990 | EP0383451A1 Optical disc recording and reproducing apparatus |
| 08/22/1990 | EP0383386A1 Method of and apparatus for writing and reading a magneto-optical record carrier and magneto-optical record carrier for use with the apparatus |
| 08/22/1990 | EP0383216A2 Magneto-optical layer and process for its manufacture |
| 08/22/1990 | EP0382859A1 Magnetooptical recording medium |
| 08/21/1990 | US4951274 Magneto-optical head capable of separating beams for reading recorded information and servo information by use of one optical element |
| 08/21/1990 | US4951154 Magneto-optic recording/reproducing apparatus |
| 08/21/1990 | US4950556 Magneto-optic recording medium |
| 08/21/1990 | US4950547 Bariumand strontium titinates and their nitrides; coatings |
| 08/16/1990 | EP0382204A2 Magneto-optical recording medium |
| 08/16/1990 | EP0382192A1 Scanning tunneling microscope memory apparatus |
| 08/16/1990 | CA2010014A1 Magnetooptic layer and a process for its fabrication |
| 08/16/1990 | CA2008019A1 Magneto-optic recording system |
| 08/14/1990 | US4949331 Apparatus and record carrier for optical disc memory with correction pattern and master disc cutting apparatus |
| 08/14/1990 | US4949198 Thermomagnetic recording head and mode of embodiment |
| 08/14/1990 | CA1272845A1 Recording disks and process |
| 08/08/1990 | EP0381158A2 Memory device |
| 08/08/1990 | EP0381113A2 Tunnel current data storage apparatus having separate lever bodies |
| 08/08/1990 | EP0380708A1 Overwrite type magnetooptical recording apparatus |
| 08/08/1990 | EP0380532A1 Preparation of thin layers of iron iii oxide for optical and/or magnetic recording. |
| 08/07/1990 | US4946501 Alloy target for magneto-optical recording |
| 08/01/1990 | EP0380329A1 Magneto-optic player |
| 08/01/1990 | EP0196332B1 Method of manufacturing photothermomagnetic recording film |
| 07/31/1990 | US4945528 Method of recording binary information in a magneto-optical storage layer, and arrangement for carrying out the method |
| 07/31/1990 | US4945527 Optical pickup apparatus for detection of focusing error, tracking error, and information |
| 07/26/1990 | WO1990008382A1 Optical disk and method of manufacturing the same |
| 07/25/1990 | EP0379285A2 Tracking control apparatus for a recording/reproducing apparatus on or from an optical disk |
| 07/24/1990 | US4944037 Optical system for recording information in erasable and non-erasable modes |
| 07/24/1990 | US4943957 Magneto-optical, glass layer |
| 07/24/1990 | US4943131 Thin-film optical function element, and optical head using the same |
| 07/18/1990 | EP0378449A2 Information recording and retrieval system |
| 07/18/1990 | EP0378444A2 Reproducing apparatus |
| 07/18/1990 | EP0378443A2 Method for recording and reproducing information |
| 07/18/1990 | EP0378216A1 Photomagnetic eraser |
| 07/17/1990 | US4942486 Recording disk having read-only recording area and writable recording area and a driving apparatus therefor |
| 07/11/1990 | EP0377340A2 Recording/reproducing device |
| 07/10/1990 | US4941139 Checking media operations and recording during optical recording |
| 07/04/1990 | EP0376818A2 Magneto-optical disk recording apparatus |
| 07/04/1990 | EP0376756A2 Recording/reproducing device |
| 07/04/1990 | EP0376680A2 Overwritable magneto-optical recording medium and recording method utilizing the same |
| 07/04/1990 | EP0376626A2 Optical information recording medium with a separating part between information tracks |
| 07/04/1990 | EP0376375A1 Method of thermomagnetic recording of information and optical read-out of the stored information, and also a recording element suitable for use in this method |
| 07/03/1990 | US4939715 Tape scanning apparatus |
| 07/03/1990 | US4939711 Arrangement for minimizing effects of leakage magnetic fields in optomagnetic recording/reproducing apparatus |
| 07/03/1990 | US4939710 Optical magnetic memory device utilizing non-recorded portions of recording medium to represent data |
| 07/03/1990 | US4939023 Opto-magnetic recording medium |
| 07/03/1990 | US4938915 Method of recording at least ternary data on optomagnetic recording medium having a plurality of magnetic layers |
| 06/27/1990 | EP0375492A1 Optical device for observing an elongate object |
| 06/27/1990 | EP0375358A2 Helical scan tape record apparatus and method |
| 06/27/1990 | EP0375342A2 Data recording/reproducing apparatus using a recording disk |
| 06/26/1990 | US4937802 Magnetic head drive circuit |
| 06/26/1990 | US4937801 Magneto-optical recording and reproducing apparatus with magnetic field controller |
| 06/26/1990 | US4937800 Method of recording using selective-erasure directions for magnetooptic record members |
| 06/26/1990 | US4937799 Method and apparatus for setting light quantity most suitable for reproducing information from an optical recording medium |
| 06/26/1990 | US4937440 System and method for beam farfield shift focus compensation |
| 06/22/1990 | CA2005672A1 Helical scan tape record apparatus and method |
| 06/20/1990 | EP0373898A2 Over write capable magnetiooptical recording medium |
| 06/20/1990 | EP0373707A2 Magneto optic data recording system with variable field strength, actuator therefor and method of providing |
| 06/20/1990 | CN1043203A Optical output controlling method and apparatus therefor |
| 06/19/1990 | US4935915 Beam controller for magneto-optical disc memory system |
| 06/19/1990 | US4935911 Optical head device for recording and reproducing information |
| 06/13/1990 | EP0372881A2 Optical output controlling method and apparatus therefor |
| 06/13/1990 | EP0372517A2 Magneto-optical recording medium and process for production of the same |
| 06/13/1990 | CN1043035A Circuitry for reversing magnetic field |
| 06/12/1990 | US4933926 Image forming medium, method and apparatus |
| 06/12/1990 | US4933924 Optical head and magneto-optical read/write device |
| 06/12/1990 | US4933923 Optical record carrier inscribed with read-out control data and apparatus for reading such record carrier in conformity with such control data |
| 06/12/1990 | US4933794 Head for reading a magneto-optical data carrier |
| 06/06/1990 | CN1042787A Circuit device for identifing the type of optical recording medium |
| 06/05/1990 | US4932012 Method for regenerating information from a magneto-optical information recording medium |
| 06/02/1990 | CA2004377A1 Optical output controlling method and apparatus therefor |
| 05/31/1990 | WO1990005980A1 Circuit for reversing a magnetic field |
| 05/31/1990 | WO1990005977A1 Circuit arrangement for identifying the type of an optical record carrier |
| 05/30/1990 | EP0370067A1 Preparation of thin layers of iron iii oxide for optical and/or magnetic recording. |
| 05/29/1990 | US4929320 Transition metal alloy, direct current sputtering rare earth elements |
| 05/23/1990 | EP0369815A2 A magneto-optical recording medium and the recording method therefor |
| 05/23/1990 | EP0369794A2 Optical information recording medium and recording/reproducing system |
| 05/23/1990 | EP0369610A1 Magnetooptical recording media |
| 05/22/1990 | US4927513 Sputtering |
| 05/16/1990 | EP0368616A2 Magneto-optical recording medium and production process |
| 05/16/1990 | EP0368194A2 Magneto-optical system |
| 05/16/1990 | CN1042264A Circuit arrangement for inverting magnetic field |
| 05/16/1990 | CN1042258A Magnetooptical recording media |
| 05/16/1990 | CN1042257A Magnetooptical recording media |
| 05/15/1990 | US4926409 Optical permitting record/playback from both sides of an optical disk |
| 05/15/1990 | US4926408 Magneto-optic recording/erasing system with simultaneous dual head control and disk error detection |
| 05/15/1990 | US4926403 Magneto-optic recording apparatus for recording information selectively on both sides of the recording medium |
| 05/15/1990 | US4926402 Method of recording bivalent signals on opto-magnetic record medium |
| 05/15/1990 | US4925742 Halogen contaning compound; magnetic and optical recording media |
| 05/15/1990 | US4925733 Magnetic recording medium |
| 05/15/1990 | US4925717 Disk-shaped recording medium and disk apparatus |
| 05/09/1990 | EP0367685A2 Magnetooptical recording element |
| 05/08/1990 | US4924447 Optical memory device for recording, reproducing or erasing information onto a recording medium, including a recorded region detecting circuit. |
| 05/08/1990 | US4924436 Data storage device having a phase change memory medium reversible by direct overwrite and method of direct overwrite |
| 05/08/1990 | US4924330 System and method for improving the performance of high-density data storage media |