| 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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| 08/20/1991 | US5042020 Information recording and/or reproducing apparatus with an optical medium sensor for providing automatic variation in light beam intensity in accordance with various recording medium |
| 08/20/1991 | US5041341 Information recording media |
| 08/14/1991 | EP0441626A2 Medium, process for preparing the same, information processing device, information processing method |
| 08/14/1991 | EP0441611A1 Magneto-optical recording medium and method for processing the surface |
| 08/14/1991 | EP0441561A2 Apparatus for generating magnetic field varying in response to an information signal |
| 08/14/1991 | EP0440963A2 Enhanced focus sensing in optical information storage systems |
| 08/14/1991 | EP0440810A1 Optical recording medium and information recording apparatus |
| 08/13/1991 | US5040166 Magneto-optical recording medium having a reflective film of Ag and Mn or Ag, Mn and Sn |
| 08/13/1991 | US5040163 Laser beam control circuit for optical recording/reproducing apparatus |
| 08/08/1991 | WO1991011807A1 Optical disc system and optical disc |
| 08/08/1991 | WO1991011806A1 Magneto-optical recording/reproducing apparatus |
| 08/08/1991 | WO1991011805A1 Transfer apparatus and transfer method |
| 08/07/1991 | EP0440486A2 Magneto-optical recording method and magneto-optical recording medium used in the same |
| 08/07/1991 | EP0440268A2 Atomic force sensor head with interferometric measurement of the properties of a data store |
| 08/07/1991 | EP0440215A2 Transfer device for disc base plate |
| 08/07/1991 | EP0440214A2 Method for producing optical disc |
| 08/07/1991 | EP0439876A1 Optical head with a double-beam splitter |
| 08/07/1991 | EP0439737A1 Magneto-optic storage media structures |
| 08/07/1991 | EP0324831A4 Erasable optical wallet-size data card |
| 08/07/1991 | EP0282527B1 Method for making an amorphous aluminum-nitrogen alloy layer |
| 08/07/1991 | CN1053702A Method of and device for providing record carrier with pattern of areas having modified optical properties |
| 08/06/1991 | US5038333 Positioning systems including reliable track crossing detection for high speed relative motions |
| 08/06/1991 | US5038330 Bias magnetic field impress apparatus for opto-magnetic disk apparatus including permanent magnet |
| 08/06/1991 | US5038322 Method of and device for sub-micron processing a surface |
| 08/06/1991 | US5038321 Eraseable electro-optic storage disk, method of and apparatus for recording and reading data therefor |
| 07/31/1991 | EP0439383A1 Device to read oblong segments from a moving recording medium |
| 07/31/1991 | EP0439323A1 Magneto-optical recording apparatus |
| 07/31/1991 | EP0439286A2 Recording apparatus for magneto-optical disc |
| 07/31/1991 | EP0439196A2 Optical disk |
| 07/31/1991 | EP0438828A1 Method of and device for providing a record carrier with a pattern of areas having modified optical properties |
| 07/31/1991 | EP0438784A2 Apparatus for generating clock signals for data reproduction |
| 07/25/1991 | DE4041302A1 Optical pick=up for disc systems - has reflected signals separated into polarised components for precise track control |
| 07/24/1991 | EP0438315A2 Magneto-optical recording device |
| 07/24/1991 | EP0438304A1 Method and apparatus for recording information onto magneto-optical recording medium |
| 07/24/1991 | EP0438256A2 Information processing apparatus, information processing method, and recording medium employed therefor |
| 07/24/1991 | EP0438042A2 Utilizing wasted laser light in optical systems |
| 07/24/1991 | CN1013324B Magnetic optical disk memory alloy material and its preparing technique |
| 07/23/1991 | US5034940 Information retrieval system with a tracking error threshold compensation of retrieved data and tracking error signals |
| 07/23/1991 | US5034938 Optical disc recording and playing apparatus |
| 07/23/1991 | US5034934 Opto-magnetic disk unit with improved dynamic range characteristics and opto-magnetic disk therefor |
| 07/23/1991 | US5034933 Magneto-optical recording apparatus |
| 07/23/1991 | US5033828 Optical output controlling method and apparatus |
| 07/23/1991 | US5033528 Personal portable sunshade |
| 07/20/1991 | WO1991011003A1 Method of recording and reproducing data |
| 07/17/1991 | EP0437308A2 Recording method for magneto-optical memory medium |
| 07/17/1991 | EP0437275A2 Microprobe, method for producing the same, and information input and/or output apparatus utilizing the same |
| 07/17/1991 | EP0437170A1 Magneto-optic method and system for recording and retrieving high-density digital data |
| 07/16/1991 | US5033043 Optical head apparatus for optical disks |
| 07/16/1991 | US5032470 Optical recording medium with an aluminum alloy metallic layer containing at least hafnium |
| 07/16/1991 | US5032465 Rare earth and conductive element |
| 07/16/1991 | US5031993 Detecting polarization state of an optical wavefront |
| 07/11/1991 | WO1991010234A1 Multitrack magneto-optical reading head |
| 07/10/1991 | EP0436424A1 Magnetooptical read head |
| 07/10/1991 | EP0436175A2 Method for storage of information units in the nanometer domain |
| 07/10/1991 | EP0436018A1 Disk-like recording medium |
| 07/10/1991 | EP0210275B1 Recording/reproducing apparatus using magneto-optical disk |
| 07/09/1991 | US5031168 Apparatus and method for increasing storage capacity of recording media |
| 07/09/1991 | US5031162 Magneto-optical recorded medium with a transparent substrate layer |
| 07/09/1991 | US5030512 Magneto-optical recording medium |
| 07/03/1991 | EP0435697A1 Magneto-optical recording/reproducing device |
| 07/03/1991 | EP0435425A2 Recording and reading method and device of magneto-optical memory elements |
| 07/03/1991 | EP0435278A2 Bias magnetic field generating apparatus |
| 07/03/1991 | EP0215846B1 Two-sided optical recording medium |
| 07/02/1991 | US5029156 Method and means for reading electronic signal patterns stored on a movable image recording surface |
| 07/02/1991 | US5028774 Method and apparatus for detecting and measuring the refractive index of an optical disc substrate |
| 07/02/1991 | US5028305 Terbium-cobalt-iron-chromium alloy containing oxygen |
| 07/01/1991 | CA2031819A1 Storage of information units in the nanometer range |
| 06/27/1991 | WO1991009400A1 Optical recording apparatus |
| 06/26/1991 | EP0434230A2 Optical recording medium and method of recording and reproducing information thereon |
| 06/25/1991 | US5027334 Magneto-optical disk device with movable coil |
| 06/25/1991 | US5027216 Image pickup apparatus |
| 06/25/1991 | CA1285231C Optical turntable system |
| 06/19/1991 | EP0433082A1 Synchronizing signal detector for multi-beam optical disk unit |
| 06/19/1991 | EP0433021A2 Floating type magnetic head device |
| 06/19/1991 | EP0432977A2 Optical device for detecting modulation in a light beam |
| 06/19/1991 | EP0432976A2 Magnetooptic data storage apparatus and magnetooptic disk |
| 06/19/1991 | EP0432863A2 Information processing apparatus with recording medium discharging mechanism for preventing change or loss of information of recording medium by temperature increase of the apparatus |
| 06/19/1991 | EP0432312A1 Magneto-optic data recording apparatus |
| 06/18/1991 | US5025430 Magneto-optic recording and reproducing apparatus including a multiple layer recording medium having a premagnetized bias layer replacing an external bias magnetic |
| 06/18/1991 | US5025147 Laser light |
| 06/13/1991 | WO1991008578A1 Process for sputtering multilayers for magneto-optical recording |
| 06/12/1991 | EP0432038A1 Process for the preparation of a magnetooptical memory |
| 06/12/1991 | EP0431946A2 Method and apparatus for magneto-optical recording |
| 06/12/1991 | EP0431604A2 A magnetic bias apparatus for a magnetooptical disk drive apparatus |
| 06/11/1991 | US5023859 Optical data storage apparatus and method utilizing an amorphous polymer which exhibits photochromic properties |
| 06/11/1991 | US5023854 Disc having a data read-only area and a data recording arm and a recording reproducing system therefor |
| 06/05/1991 | EP0430811A2 Magneto-optical signal reproducing apparatus |
| 06/05/1991 | EP0430799A2 Rotary optical head |
| 06/05/1991 | EP0430422A2 Magneto-optical recording disk |
| 06/05/1991 | EP0430162A2 Optical memory and information processing apparatus |
| 06/04/1991 | US5022018 System for applying a perpendicular magnetic field to the illuminated side of a magneto-optic medium |
| 06/04/1991 | US5022017 Magneto optic data recording system with variable field strength, actuator therefor and method of providing |
| 06/04/1991 | US5021302 Magnetic domain or bubble and magneto-optic devices containing at least one rare earth element of the group europium, samarium or terbium |
| 05/30/1991 | WO1991007749A1 Optical pickup device and magnetooptical reproducing apparatus |
| 05/30/1991 | WO1991007748A1 Magnetooptical recording medium |
| 05/30/1991 | WO1991007701A1 Electrostatic information recording medium and electrostatic information recording/reproducing method |
| 05/30/1991 | CA2030922A1 Optical memory and information processing apparatus |
| 05/29/1991 | EP0429343A2 A recording apparatus using magneto-optical effect |
| 05/29/1991 | EP0429221A2 A magnetooptic recorder-player |
| 05/29/1991 | EP0429219A2 Apparatus for detection of optical wavefront polarization state |