| Patents for G11B 21 - Head arrangements not specific to the method of recording or reproducing (20,963) |
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| 05/07/1985 | US4516161 System for pausing reproduction in rotary recording medium reproducing apparatus |
| 05/07/1985 | US4516160 Information recording and reproducing system |
| 05/07/1985 | CA1186796A1 Device for positioning objects which have a low mass |
| 05/02/1985 | EP0139531A2 Track following servo for higher density disk files |
| 05/02/1985 | EP0139372A1 Actuator assembly for memory apparatus |
| 05/02/1985 | EP0139332A2 Apparatus for reproducing information from a disc-shaped optically readable record carrier |
| 05/02/1985 | EP0139180A1 Feed device for magnetic head |
| 05/02/1985 | EP0139086A1 Head access mechanism for magnetic disk memory device |
| 05/02/1985 | EP0138947A1 System for sensing the rotational position of a rotating disk having coarse seek tracks |
| 04/30/1985 | US4514837 Apparatus for optically reading and/or recording information |
| 04/30/1985 | US4514773 Circuit arrangement for generating an actuating signal for a piezo-electric element of a positioning device |
| 04/25/1985 | WO1985001806A1 Track following servo for higher density disk files |
| 04/24/1985 | EP0138202A2 Tracking system for rotary magnetic recording medium |
| 04/23/1985 | US4513410 Pickup cartridge having stylus holder |
| 04/23/1985 | US4513336 Cassette tape recorder |
| 04/23/1985 | US4513333 Diagnostic recording |
| 04/23/1985 | US4513331 Method and apparatus for disk drive alignment |
| 04/17/1985 | EP0137051A1 Method of manufacturing a magnetic head flying body |
| 04/16/1985 | US4512010 Apparatus for controlling linear tracking arm in record player |
| 04/16/1985 | US4512002 Tracking servo system of recording disc information recording and reproducing apparatus |
| 04/16/1985 | US4511938 Magnetizable recording disk and disk file employing servo sector head positioning |
| 04/16/1985 | US4511933 Method and apparatus for recording a digital information signal |
| 04/11/1985 | WO1985001605A1 Tracking servo circuit for optical disk |
| 04/10/1985 | EP0136785A1 Position control apparatus for controlling positions of rotary heads with respect to a recording medium |
| 04/10/1985 | EP0136777A1 Linear motor |
| 04/10/1985 | EP0136776A1 Linear motor |
| 04/09/1985 | US4510541 Magnetic disk storage unit with reciprocating magnetic head for cleaning the magnetic disc |
| 04/09/1985 | US4510532 Rotary recording medium reproducing apparatus |
| 04/09/1985 | US4510531 Rotary recording medium and reproducing apparatus thereof |
| 04/09/1985 | CA1185307A1 Combined linear motor and side mounted outboard carriage |
| 04/03/1985 | EP0136051A1 Disc recording and/or reproducing apparatus |
| 04/02/1985 | US4509160 Disc drive assembly |
| 04/02/1985 | US4509154 Optical disk apparatus |
| 03/28/1985 | WO1985001379A1 Disk accessing circuitry |
| 03/27/1985 | EP0134812A1 Magnetic transducer positioning apparatus |
| 03/26/1985 | US4507771 Motor drive apparatus |
| 03/26/1985 | US4507769 Disc reproducing apparatus |
| 03/26/1985 | US4507696 Drum-shaped scanning device |
| 03/20/1985 | EP0134428A1 Reading device for the optical scanning of information recorded on a moving disc-shaped carrier |
| 03/19/1985 | US4506307 Magnetic head slider and actuator assembly |
| 03/19/1985 | US4506149 Tracking servo signal generating device in an apparatus for reading recorded information |
| 03/19/1985 | CA1184294A1 Actuating device for the magnetic-head assembly of a diskette drive mechanism |
| 03/14/1985 | WO1985001145A1 Track offest correction and gain adjustment in a disk drive servo using stored correction values |
| 03/12/1985 | US4504941 Stylus cartridge having stylus arm restraint |
| 03/12/1985 | US4504935 Electrodynamic focus and radial slide drive for an optical disc system |
| 03/12/1985 | US4504879 Disc drive arrangement |
| 03/05/1985 | CA1183603A1 Apparatus and method for determining read head position |
| 02/28/1985 | WO1985000918A1 Method and apparatus for hydrodynamic magnetic recording |
| 02/27/1985 | EP0133594A2 Disc drive arrangement for a hard disc cartridge |
| 02/19/1985 | US4500981 Jitter compensation system in a rotary recording medium reproducing apparatus |
| 02/19/1985 | CA1182913A1 Disc player |
| 02/19/1985 | CA1182846A1 Rolling bias spring |
| 02/12/1985 | US4499511 System for detecting position of a read-write head in seek operation on a disk memory having data servo spectors |
| 02/12/1985 | US4499505 Apparatus for playing back video signals recorded on a rotary recording medium on several quasi-slow motion reproduction modes |
| 02/12/1985 | CA1182561A1 Digital audio disc player |
| 02/12/1985 | CA1182559A1 Head support arm and head/arm assemblies for disk files |
| 02/05/1985 | US4498158 Address data searching method for data recording medium reproducing device |
| 02/05/1985 | US4498129 Method and apparatus for normalizing servo-positioning signals |
| 01/31/1985 | WO1985000476A1 Disc drive actuator with improved vcm housing |
| 01/31/1985 | WO1985000474A1 Motor with "split" back-magnet array |
| 01/31/1985 | WO1985000459A1 Method and apparatus to improve the positioning accuracy of a tracking arm |
| 01/31/1985 | WO1985000458A1 Disk drive positioning system providing passive head crash protection |
| 01/29/1985 | US4496993 Rotary recording medium |
| 01/29/1985 | CA1181844A1 Apparatus for controlling linear tracking arm in record player |
| 01/22/1985 | US4495608 Device for rapidly moving an optical pick-up device in an optical reproducing apparatus to a desired position on a record disc |
| 01/22/1985 | CA1181519A1 Apparatus for optically reproducing an information signal from a record disk |
| 01/16/1985 | EP0131469A2 Disk drive positioning system providing passive head crash protection |
| 01/15/1985 | US4494225 Optical disc reproducing apparatus |
| 01/15/1985 | US4494159 Magnetic head-positioning device for magnetic disc drive |
| 01/15/1985 | US4494154 Pickup control device and method for fast or slow reproduction in a disk reading system |
| 01/09/1985 | EP0130836A2 Apparatus to improve the positioning accuracy of a tracking arm |
| 01/09/1985 | EP0130495A1 A record disk bearing a servo pattern and record disk apparatus comprising such a record disk |
| 01/09/1985 | EP0130248A1 Track following servo system for a disk file |
| 01/08/1985 | US4493070 Video disc player having carriage drive mechanism |
| 01/08/1985 | US4493068 Pick-up point dislocation detecting device in recording a disc player |
| 01/08/1985 | CA1180803A1 Information recording apparatus with a disc loaded in a casette |
| 01/02/1985 | EP0129973A1 Magnetic disc memory apparatus incorporating temperature compensation |
| 01/02/1985 | EP0129708A1 Phase modulated servo system for a disk file |
| 01/02/1985 | CA1180443A Control system for flexible disk file |
| 01/01/1985 | US4491941 Reproducing stylus for an information signal recording medium |
| 01/01/1985 | US4491884 Method of monitoring head alignment in a magnetic data storage device |
| 01/01/1985 | US4491877 Cross-talk detector in information-carrying disc player |
| 01/01/1985 | US4491776 Servo operated digital positioning control system |
| 12/27/1984 | EP0129475A2 Magnetic tachometer for disk drives |
| 12/27/1984 | EP0129336A1 Transducer-slider assembly having contoured air-bearing surface |
| 12/27/1984 | CA1180113A Magnetic reproducing apparatus |
| 12/27/1984 | CA1180112A Reproducing apparatus |
| 12/27/1984 | CA1180111A Reproducing apparatus |
| 12/25/1984 | US4490758 Pinch-holder for magnetic disk |
| 12/25/1984 | US4490756 Servo encodement and detection system using tetra-orthogonal servo pattern |
| 12/25/1984 | US4490752 Rotary recording medium having a selectively reproducible continuous stream of audio signals recorded thereon and reproducing apparatus therefor |
| 12/19/1984 | EP0128650A1 Mechanical damper for disk drives having band drive actuators |
| 12/18/1984 | US4489409 Signal pickup device for disc reproducers |
| 12/18/1984 | US4489406 Optical memory system having a short seek capability |
| 12/11/1984 | US4488285 Stylus lifter locking mechanism for video disc player |
| 12/11/1984 | US4488278 Coding system for digital audio disc record |
| 12/11/1984 | US4488276 Information read apparatus with tracking control system |
| 12/11/1984 | US4488275 Tracking system for video disc player |
| 12/11/1984 | US4488189 Sector servo seek control |
| 12/11/1984 | US4488188 Buried servo recording system using phase encoded servo pattern |