| 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) |
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| 07/03/1991 | CN1052742A 光学循迹装置 Optical tracking device |
| 07/02/1991 | US5029261 Apparatus for detecting position of light beam on object surface by comparing detection beams split near focal point |
| 07/02/1991 | US5029255 Optical scanning device including mirror objective having two windows at least one having an aspherical surface |
| 07/02/1991 | US5029157 Disk player having a pickup securing device |
| 07/02/1991 | US5029155 Optical information recording/reproducing apparatus in which recording power is set prior to recording |
| 07/02/1991 | US5029154 Optical reproducing apparatus |
| 07/02/1991 | US5029152 Apparatus for detecting delete patterns of optical discs |
| 07/02/1991 | US5029151 Optical information processing apparatus including a limiter for limiting error of focusing and/or tracking actuators and a circuit for adjusting the limit range thereof |
| 07/02/1991 | US5029150 Tracking device for optical memory card |
| 07/02/1991 | US5029030 Rotary actuator system with zero skew angle variation |
| 07/02/1991 | US5029023 Laser-amplified motion detector and method |
| 07/02/1991 | US5028774 Method and apparatus for detecting and measuring the refractive index of an optical disc substrate |
| 07/02/1991 | US5028708 Azamethinyl quinoline derivatives |
| 07/02/1991 | US5028467 Dithiolate metal complex compound, production method of the same, and optical information recording medium comprising the same |
| 07/02/1991 | CA1285651C Restoring and clocking pulse width modulated data |
| 06/27/1991 | WO1991009400A1 Optical recording apparatus |
| 06/27/1991 | WO1991009399A1 Circuit arrangement for operating a light source for the optical scanning of recording substrates |
| 06/27/1991 | DE4041872A1 Laser printing scanning system - has fast spot width control and uses modulated semiconductor light-guide array |
| 06/27/1991 | DE3942943A1 Optische abtastvorrichtung Optical scanning device |
| 06/27/1991 | DE3942199A1 Quality testing of optical discs - having laser intensity and amplifier gains varied during test cycle |
| 06/26/1991 | EP0434566A2 Optical recording medium and manufacturing method thereof |
| 06/26/1991 | EP0434466A2 Stabilized-feedback control device for semiconductor lasers |
| 06/26/1991 | EP0434315A1 Error correction in data storage devices |
| 06/26/1991 | EP0434230A2 Optical recording medium and method of recording and reproducing information thereon |
| 06/26/1991 | EP0434114A1 Optical memory element and manufacturing method thereof |
| 06/25/1991 | US5027340 Object lens head assembly |
| 06/25/1991 | US5027339 Optical card analyzing apparatus |
| 06/25/1991 | US5027338 Tracking defect preventing circuit |
| 06/25/1991 | US5027337 Optical recording medium and tracking method therefor |
| 06/25/1991 | US5027336 Optical information reading apparatus with tracking adjustment system |
| 06/25/1991 | US5026981 Servo control gain adjustment for an optical disk apparatus |
| 06/25/1991 | US5026623 Optical recording medium |
| 06/25/1991 | US5026619 A light absorber and a photochromic, thermochromic fulgide or lactone; laser recording; laser of visible light to erase |
| 06/25/1991 | US5026510 Mold for cast molding substrate having preformat with information pits and method of using same |
| 06/25/1991 | CA1285332C Method for optical information recording |
| 06/25/1991 | CA1285231C Optical turntable system |
| 06/19/1991 | EP0433220A2 Substituted naphthalocyanine and its use |
| 06/19/1991 | EP0433082A1 Synchronizing signal detector for multi-beam optical disk unit |
| 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 | EP0432841A2 Spiro-indoline-oxazine compounds with photochromatic and photosensitizing characteristics and the process for their preparation |
| 06/19/1991 | EP0432839A2 Photochromatic and thermochromatic spiro-oxazepin-oxazine compounds and the process for their preparation |
| 06/19/1991 | EP0432832A1 Method and device for removing a flexible product from a carrier plate |
| 06/19/1991 | EP0432779A1 Information processing apparatus and optical head incorporated therein |
| 06/19/1991 | EP0432731A2 Information recording medium and information recording and reproducing method and apparatus |
| 06/19/1991 | EP0432658A2 Method of focussing a light beam onto an optical record carrier |
| 06/19/1991 | EP0432278A1 Seek control apparatus |
| 06/19/1991 | EP0192778B1 Optical recording medium |
| 06/19/1991 | CN1052312A Intrinsically low birefringent molding polymers, process for preparation and molded objects therefrom |
| 06/18/1991 | US5025439 Method for recording and reproducing of information on an optical disk of a phase-change type |
| 06/18/1991 | US5025438 Recording and reproducing optical information device which converts the first beam into a second beam having different light intensity distribution |
| 06/18/1991 | US5025435 Apparatus for reading or writing contrast enhanced information optical record carrier |
| 06/18/1991 | US5025434 Tracking servo apparatus of disk player |
| 06/18/1991 | US5025433 Electro-optical device |
| 06/18/1991 | US5025432 Autochanger of writable discs including a non-volatile memory for storing most recent defect management information relating to the writable discs |
| 06/18/1991 | US5025431 Autochanger of writable discs |
| 06/18/1991 | US5025371 Overload protected rack and pinion drive for an optical scanning device |
| 06/18/1991 | US5025209 Apparatus for detecting surface potential distribution |
| 06/18/1991 | US5024927 Information recording medium |
| 06/18/1991 | US5024926 Heat, light, weather resistance; for optical recording media, filters, liquid crystal displays |
| 06/18/1991 | US5024923 Sulfur-containing metal complex |
| 06/18/1991 | US5024917 Optical recording medium containing meta-position aluminium-type IR-ray absorptive compound |
| 06/18/1991 | US5024910 Optical information recording medium |
| 06/18/1991 | US5024784 Locally reorienting molecules by photoisomerization of photochromic groups |
| 06/18/1991 | US5024744 Stamper cleaning apparatus |
| 06/13/1991 | WO1991009397A1 Three laser optical disk drive system |
| 06/13/1991 | WO1991008568A1 A tracking system in an optical recording/reproducing device |
| 06/13/1991 | CA2071852A1 Three laser optical disk drive system |
| 06/12/1991 | EP0431928A1 Optical disc apparatus |
| 06/12/1991 | EP0431903A2 Intrinsically low birefringent molding polymers, process for preparation and molded objects therefrom |
| 06/12/1991 | EP0431859A2 Disc evaluating apparatus |
| 06/12/1991 | EP0431489A2 Information processing device and optical disk memory used therefor |
| 06/12/1991 | EP0431194A1 Optical disk device |
| 06/12/1991 | EP0431185A1 Optical recorder |
| 06/12/1991 | EP0431155A1 Device for recording information on an optical record carrier. |
| 06/12/1991 | CN1012858B 光学记录介质 The optical recording medium |
| 06/11/1991 | US5023861 Single stage tracking actuator apparatus for optical beam information storage drive system |
| 06/11/1991 | US5023860 Multi-beamed optical pick-up |
| 06/11/1991 | US5023859 Optical data storage apparatus and method utilizing an amorphous polymer which exhibits photochromic properties |
| 06/11/1991 | US5023858 Separation type optical pickup device |
| 06/11/1991 | US5023857 Optical information storage apparatus including eccentricity compensator |
| 06/11/1991 | US5023856 Optically readable record carrier for recording information, apparatus for manufacturing such a record carrier, apparatus for recording information on such a record carrier, and apparatus for reading information recorded on such a record carrier |
| 06/11/1991 | US5023855 Optical disc access control system that counts tracks using tracking control signal |
| 06/11/1991 | US5023854 Disc having a data read-only area and a data recording arm and a recording reproducing system therefor |
| 06/11/1991 | US5023439 Arrangement for detecting a signal for effecting a focus control of an optical head |
| 06/11/1991 | US5023168 Optical recording media; ring opening with a nucleophile and reacting with the phthalocyanine dye followed by endcapping |
| 06/11/1991 | US5023167 Optical information card |
| 06/09/1991 | CA2031783A1 Intrinsically low birefringent molding polymers, process for preparation and molded objects therefrom |
| 06/05/1991 | EP0430799A2 Rotary optical head |
| 06/05/1991 | EP0430649A2 Optical disk apparatus operative with optimal recording power setting |
| 06/05/1991 | EP0430629A2 Information recording media |
| 06/05/1991 | EP0430541A2 Tracking control apparatus |
| 06/05/1991 | EP0430497A2 Optical disc servo apparatus |
| 06/05/1991 | EP0430456A2 Track jump control devices |
| 06/05/1991 | EP0430453A2 Error recovery in a cartridge handling system |
| 06/05/1991 | EP0430311A1 Method of reproducing a flexible optical information recording medium and adapter for use in reproduction of said medium |
| 06/05/1991 | EP0430183A2 Fiber type light wave-length converting apparatus |
| 06/05/1991 | EP0430162A2 Optical memory and information processing apparatus |
| 06/05/1991 | EP0430042A2 A recording medium and method of reproducing thereof |