| 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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| 05/19/1981 | US4268745 Tracking servo drawing device in optical type information reading device |
| 05/19/1981 | US4268575 Thermal recording elements |
| 05/19/1981 | US4268129 Mirror for optical recording system |
| 05/19/1981 | CA1101543A1 Servomechanism for recording and/or reproducing apparatus using a rotatable recording carrier |
| 05/15/1981 | EP0020745A4 Method of recording data on an optical disc. |
| 05/06/1981 | EP0028111A1 Apparatus and method for optically recording an information signal with reduced second harmonic distortion and a record so made |
| 05/05/1981 | CA1100517A1 Isolation of uteroevacuant substances from plant extracts |
| 04/30/1981 | WO1981001217A1 Fluorescent soundtrack readout system |
| 04/30/1981 | WO1981001204A1 Motion picture film having digitally coded soundtrack and method for production thereof |
| 04/28/1981 | US4264986 Information-recording process & apparatus |
| 04/28/1981 | US4264911 Optical recording disc and related method of manufacture |
| 04/28/1981 | US4264551 Recorded disk reproducing system |
| 04/28/1981 | CA1100233A1 Scanning light beam of changing size |
| 04/21/1981 | US4262875 Information record stampers |
| 04/21/1981 | CA1099815A1 Apparatus for optically detecting information signals on a carrier |
| 04/16/1981 | WO1981001072A1 Apparatus and method for detecting crossmodulation distortion |
| 04/14/1981 | US4261646 Beam splitter for optical player |
| 04/14/1981 | CA1099288A1 Phenylsulfamoyl couplers, coupler compositions and photographic elements suited to forming integral sound tracks |
| 04/08/1981 | EP0026552A2 Apparatus for controlling the motion of an elongated object; case for a tape-like information carrier provided with such apparatus; apparatus for writing, reading or erasing information on a tape-like information carrier contained in such a case |
| 04/08/1981 | EP0026550A2 A case with an information carrier consisting of a tape one side of which has a structure carrying optically readable information, as well as an apparatus for writing, reading or erasing such information |
| 04/08/1981 | EP0026517A1 Record carrier containing information in an optically readable information structure, as well as apparatus for reading said carrier |
| 04/07/1981 | US4260858 Videodisc player with drive means engaging videodisc guide groove |
| 04/01/1981 | EP0026109A2 System for controlling recording and/or reproducing element in disc-shaped recording medium recording and/or reproducing apparatus |
| 03/31/1981 | US4259605 Circuit for controlling a piezo-electric positioning element |
| 03/31/1981 | US4258981 Reproducing objective for video disks |
| 03/31/1981 | CA1098621A1 System for detecting the tracking error in optical readers and recorders |
| 03/31/1981 | CA1098620A1 Optical reading apparatus |
| 03/24/1981 | US4258282 Device for the generation of a control voltage across a piezo-electric positioning element |
| 03/24/1981 | US4257679 Reproducing objective for video disks |
| 03/18/1981 | EP0025253A1 Optical recording disk |
| 03/10/1981 | US4255654 Method of electrically detecting focal point of cameras or the like optical devices |
| 03/03/1981 | US4253723 Apparatus for optically reading information from a record carrier |
| 03/03/1981 | CA1096671A1 Electrically controllable pivoting mirror arrangement |
| 02/25/1981 | EP0024194A1 Optical record disc and method of making it |
| 02/25/1981 | EP0024136A1 Optical recording member |
| 02/24/1981 | US4253102 Optical recording apparatus |
| 02/24/1981 | US4253019 Apparatus for reading an optical record carrier having a radiation-reflecting information structure |
| 02/24/1981 | US4252889 Process of making an optically recordable and readable information carrier and the carrier obtained by this process |
| 02/24/1981 | US4252678 Preparation of colloidal dispersions of ruthenium, rhodium, osmium and iridium by the polymer-catalyzed decomposition of carbonyl cluster compounds thereof |
| 02/24/1981 | US4252677 Preparation of colloidal dispersion of nickel, palladium and platinum by the polymer-catalyzed decomposition of carbonyl compounds thereof |
| 02/24/1981 | US4252675 Preparation of colloidal group VI-A transition metal dispersions by the polymer-catalyzed decomposition of carbonyl compounds thereof |
| 02/24/1981 | US4252674 Preparation of colloidal cobalt dispersions by the polymer-catalyzed decomposition of cobalt carbonyl and cobalt organocarbonyl compounds |
| 02/24/1981 | US4252673 Preparation of colloidal cobalt dispersions by the polymer-catalyzed decomposition of cobalt carbonyl and cobalt organocarbonyl compounds |
| 02/24/1981 | US4252672 Preparation of colloidal iron dispersions by the polymer-catalyzed decomposition of iron carbonyl and iron organocarbonyl compounds |
| 02/24/1981 | US4252671 Preparation of colloidal iron dispersions by the polymer-catalyzed decomposition of iron carbonyl and iron organocarbonyl compounds |
| 02/24/1981 | US4252412 Optical focussing device |
| 02/24/1981 | CA1096494A1 Apparatus for reading a record carrier on which information for example video and or audio information is stored |
| 02/24/1981 | CA1096493A1 Electrically controlled adjusting device for a light beam with digital and analog deflection control |
| 02/18/1981 | EP0023962A1 Document scanning system |
| 02/17/1981 | CA1095782A1 Method of manufacturing a data carrier which can be optically read and a data carrier obtained by said method |
| 02/11/1981 | EP0023868A1 Optical device for access to an information carrier track and optical memory system comprising such a device |
| 02/11/1981 | EP0023809A1 Optical recording member |
| 02/11/1981 | EP0023767A1 Video player/recorder for recording on a blank disk and method for home recording |
| 02/11/1981 | EP0023736A1 Dye-containing layer of a film-forming polymeric binder and the use thereof in an information recording element |
| 02/11/1981 | EP0023674A2 An optical recording element and a method of manufacturing the same |
| 02/10/1981 | CA1095627A1 Apparatus for conducting secondary tests for security validation |
| 02/10/1981 | CA1095619A1 Defect detection system |
| 02/10/1981 | CA1095618A1 Optical signal play-back device with auto-focussing of a light beam at a record carrier surface |
| 01/28/1981 | EP0023102A1 Optical disc and method of recording information thereon |
| 01/27/1981 | US4247741 Reproducing transducer feeding device in a rotary recording medium reproducing apparatus |
| 01/27/1981 | CA1094685A1 Radiation-sensitive record with protected sensitive surface |
| 01/27/1981 | CA1094684A1 Apparatus for reading a record carrier with an optically readable information structure |
| 01/27/1981 | CA1094683A1 Optical scanning device |
| 01/21/1981 | EP0022682A1 Optical reading head with semi-conductor laser source and device for reading a record carrier by using reflexion, comprising such an optical head |
| 01/14/1981 | EP0022313A1 Recording medium, method of making a recording or a stamper and recording apparatus |
| 01/13/1981 | US4245229 Optical recording medium |
| 01/13/1981 | CA1093691A1 Data disc optical reader containing a device for automatic data access |
| 01/07/1981 | EP0021668A1 A machine for folding flexible sheet material |
| 01/07/1981 | EP0021510A1 Optical scanning apparatus with focussing system |
| 01/07/1981 | EP0021501A1 Optical focussing device |
| 01/07/1981 | EP0021411A1 Optical disk and optical information processor |
| 01/07/1981 | EP0020745A1 Method of recording data on an optical disc. |
| 01/06/1981 | US4243850 Apparatus for tracking a record track on a video disc |
| 01/06/1981 | US4243849 Signal recording device |
| 01/06/1981 | US4243848 Focus control system for optical read-out apparatus |
| 12/30/1980 | US4242689 Ablative optical recording medium |
| 12/30/1980 | US4242579 Apparatus for the pointwise scanning of an information surface |
| 12/23/1980 | US4241423 Optical memory with injection laser as light source and detector |
| 12/23/1980 | US4241355 Metal phthalocyanine dye for television recording |
| 12/23/1980 | US4241240 Optical information recording apparatus |
| 12/23/1980 | US4240704 Objective for video disks |
| 12/23/1980 | CA1092290A1 Plastics foil for the manufacture of audio-visual information carriers |
| 12/23/1980 | CA1091966A1 Apparatus for reading signals recorded on a record carrier |
| 12/16/1980 | US4239942 Dual radial position servo to compensate for radial tracking failure in an optical disc player |
| 12/16/1980 | CA1091804A2 Multi-layered optical data records and playback apparatus |
| 12/10/1980 | EP0020199A1 System for controlling the changing of the read side for the optical reader of an information carrier |
| 12/10/1980 | EP0019924A1 Method and apparatus for recording data signals on a recording medium |
| 12/09/1980 | US4238843 Disc-shaped optically readable record carrier used as a data storage medium |
| 12/09/1980 | US4238803 Information recording methods using lasers |
| 12/09/1980 | US4238179 Arrangement for pressing flexible discs and a pressing process using this arrangement |
| 12/09/1980 | CA1091348A1 Method and apparatus for increasing the recording capacity of a disc |
| 12/09/1980 | CA1091345A1 Tracking mirror device for a video disc player |
| 12/02/1980 | US4237468 Recording member |
| 12/02/1980 | US4236823 Diffractometer for measuring signal depth and width |
| 12/02/1980 | CA1090645A1 Data recording method using a metal acetyl acetonate in a light absorbing layer |
| 11/26/1980 | EP0019503A1 Method of coding the digital indexing signals of images stored on a record carrier, device for reading the signals so coded and apparatus for transmitting audiovisual signals comprising such a device |
| 11/26/1980 | EP0019379A1 A recording medium for a digital optical memory, and a memory using such a medium |
| 11/26/1980 | EP0019378A1 A digital optical memory |
| 11/26/1980 | EP0019329A1 Information recording element |
| 11/25/1980 | US4236232 Optical read apparatus for reading a disc-shaped record carrier |