| Patents for G11B 21 - Head arrangements not specific to the method of recording or reproducing (20,963) |
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| 09/15/1981 | CA1109141A1 Sampled data positioning system employing a model of the physical system for time optimal control |
| 09/09/1981 | EP0035289A2 Optical tracking system |
| 09/09/1981 | EP0035288A2 Optical tracking method and system |
| 09/09/1981 | EP0035287A2 Signal correction system and method |
| 09/09/1981 | EP0035192A1 Disc-like record carrier reproducing apparatus keeping the stylus pressure at a constant level |
| 09/03/1981 | WO1981002492A1 Information storage apparatus |
| 09/01/1981 | US4287587 Signal loss dectector for video disc |
| 09/01/1981 | US4287538 Magnetic head tracking control system |
| 08/26/1981 | EP0034245A2 Transducer carriage assembly |
| 08/25/1981 | US4286318 Control loop |
| 08/25/1981 | US4286297 Suspension for flying magnetic head |
| 08/25/1981 | US4286296 Transducer positioning system |
| 08/25/1981 | US4286290 Fast recovery squelch circuit for a video disc player |
| 08/25/1981 | US4286282 Periodically biased video disc player servo system |
| 08/19/1981 | EP0033809A2 Head arm |
| 08/18/1981 | US4285018 Disk file |
| 08/18/1981 | US4285015 Method and apparatus for locating a movable servo controlled member during position signal drop-out |
| 08/12/1981 | EP0033680A1 Platform with at least one transducer to reproduce from, or record on, one information carrier |
| 08/04/1981 | CA1106494A1 Automatic head tracking system utilizing transducer deflecting means and synchronous demodulation of the envelope signal |
| 07/29/1981 | EP0032834A1 A positionable element driving circuit |
| 07/28/1981 | CA1106061A1 Rotary recording medium with intermediate pits |
| 07/22/1981 | EP0032231A2 Positioning device for a magnetic disc drive |
| 07/21/1981 | US4280156 Lightly loaded ramp-launched read/write device for a data carrier |
| 07/21/1981 | US4280155 Method of improving air flow in compact disc drive |
| 07/21/1981 | US4280024 Selectively damped video disc stylus assembly |
| 07/21/1981 | US4280023 Stylus position sensing apparatus for video disc player |
| 07/15/1981 | EP0031876A1 Limited angle electric rotary actuator |
| 07/14/1981 | US4278846 Video disc locked groove clearance system |
| 07/14/1981 | CA1105136A1 Method and means for capturing magnetic tracks |
| 07/09/1981 | WO1981001906A1 Information recording apparatus with a disc loaded in a cassette |
| 07/09/1981 | WO1981001903A1 A method for recording track marking information on flexible magnetical information carrier discs and apparatus for fine adjustment of the position of a reading head |
| 07/08/1981 | EP0031500A2 Servo system for centering a transducer over a path |
| 07/08/1981 | EP0031361A1 Phonograph tone arm system |
| 07/08/1981 | EP0031360A1 Phonograph tone arm control system |
| 06/23/1981 | US4275427 Transducer positioning apparatus |
| 06/17/1981 | EP0030317A2 Playback apparatus for a disc-shaped record carrier, especially a video or audio disc |
| 06/16/1981 | US4274120 Information recording methods and apparatus |
| 06/16/1981 | CA1103350A1 R/w arm that prevents catastrophic failure |
| 06/03/1981 | EP0029730A1 Head load/unload mechanism for rotating magnetic memories, particularly floppy disk drives |
| 06/03/1981 | EP0029458A1 Isolated multiple core magnetic transducer assembly |
| 06/02/1981 | US4271522 Method of and apparatus for determining errors read from a magnetic recording medium |
| 06/02/1981 | US4271334 Apparatus for correcting for temperature-induced tracking errors in a system for recovering information from a recording disc |
| 05/19/1981 | US4268879 Suspension for air bearing head arm assembly |
| 05/19/1981 | US4268874 Transducer deflection apparatus for use in a video signal reproducing device |
| 05/19/1981 | US4268745 Tracking servo drawing device in optical type information reading device |
| 05/19/1981 | CA1101543A1 Servomechanism for recording and/or reproducing apparatus using a rotatable recording carrier |
| 05/12/1981 | US4266785 Stylus lifting/lowering actuator with improved electromagnetic motor |
| 05/12/1981 | CA1101119A1 Multiple pack magnetic disk system |
| 05/05/1981 | CA1100633A1 Reproducing transducer capable of tracking control |
| 05/05/1981 | CA1100630A1 Head assembly for magnetic recorders |
| 05/05/1981 | CA1100609A1 Positioning system employing feedforward and feedback control |
| 04/21/1981 | US4263627 Electronic tachometer |
| 04/16/1981 | WO1981001071A1 Z-axis flexure suspension apparatus |
| 04/16/1981 | WO1981001070A1 Transducers and supporting arm assembly for double sided floppy disk |
| 04/14/1981 | US4262174 Track skipper for video disc player |
| 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 |
| 04/07/1981 | US4261024 Transducer platform |
| 04/01/1981 | EP0026109A2 System for controlling recording and/or reproducing element in disc-shaped recording medium recording and/or reproducing apparatus |
| 04/01/1981 | EP0025826A1 Flying magnetic head/arm transducer assembly |
| 03/31/1981 | US4259605 Circuit for controlling a piezo-electric positioning element |
| 03/31/1981 | US4259602 Electromagnetic linear-motion device |
| 03/25/1981 | EP0025533A1 Arrangement for the both-sided stroke limitation of a body moving to-and-fro |
| 03/24/1981 | US4258400 Platform having at least one transducer for reading from and/or recording on a data carrier |
| 03/24/1981 | US4258282 Device for the generation of a control voltage across a piezo-electric positioning element |
| 03/24/1981 | US4258233 Track skipper apparatus for video disc player |
| 03/19/1981 | WO1981000781A1 Head positioning mechanism for data cartridge recorder |
| 03/17/1981 | US4257074 Time optimal function generator for disk file magnetic recording head servo position control loop |
| 03/17/1981 | US4256311 Video disc stylus retractor |
| 03/17/1981 | CA1097805A1 Disk file access method using sample position signal |
| 03/10/1981 | US4254959 Phonograph tone arm control system |
| 03/05/1981 | WO1981000639A1 Unit of rotatable magnetic heads |
| 03/03/1981 | CA1096777A1 Phonograph record track selection system |
| 02/24/1981 | US4253126 Linear tracking arm assembly |
| 02/19/1981 | WO1981000479A1 Media wear distribution means |
| 02/17/1981 | US4251841 Magnetic head slider assembly |
| 02/17/1981 | US4251839 Floating head device |
| 02/17/1981 | US4251838 Auto-tracking control system for use in apparatus for reproducing a video signal recorded in successive parallel tracks on a recording medium |
| 02/11/1981 | EP0023767A1 Video player/recorder for recording on a blank disk and method for home recording |
| 02/11/1981 | EP0023565A1 Arrangement for track-dependent position control in a system for recording and/or reproducing information on a magnetic recording disc, particularly of the flexible type and a magnetic recording disc therefor |
| 02/10/1981 | US4249746 Tracking control for a video disc player |
| 01/27/1981 | US4247866 Nested loop video disc servo system |
| 01/27/1981 | US4247794 Linear actuator |
| 01/27/1981 | US4247741 Reproducing transducer feeding device in a rotary recording medium reproducing apparatus |
| 01/22/1981 | WO1981000164A1 Phonograph tone arm system |
| 01/22/1981 | WO1981000163A1 Phonograph tone arm control system |
| 01/20/1981 | US4246536 Electronic velocity measurement device |
| 01/13/1981 | CA1093691A1 Data disc optical reader containing a device for automatic data access |
| 01/13/1981 | CA1093689A1 Head assembly for magnetic stripe cards |
| 12/30/1980 | CA1092707A1 Disc drive with rotary access mechanism |
| 12/23/1980 | US4241366 Magnetic head loading apparatus |
| 12/16/1980 | US4239942 Dual radial position servo to compensate for radial tracking failure in an optical disc player |
| 12/16/1980 | US4239239 Phonograph tone arm system |
| 12/11/1980 | WO1980002769A1 Isolated multiple core magnetic transducer assembly |
| 12/10/1980 | EP0020177A1 Fixed disc head actuator assembly |
| 12/10/1980 | EP0019693A1 A magnetic head slider assembly |
| 12/09/1980 | US4238809 Servo track configuration for magnetic disk apparatus |
| 12/02/1980 | US4237504 Linear actuator including limit stop assembly for magnetic disc drive |
| 12/02/1980 | US4237501 Emergency head unload system for magnetic disk drive |
| 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 | EP0019083A1 Magnetic head-mounting-assemblies |