| Patents for G11B 21 - Head arrangements not specific to the method of recording or reproducing (20,963) |
|---|
| 07/24/1990 | US4943875 Magnetic disk file head suspension assembly mounting means |
| 07/23/1990 | CA2008231A1 Disc drive safety latch using shape memory metals |
| 07/18/1990 | EP0378394A2 Track counter for optical disk |
| 07/18/1990 | EP0378345A2 Negative-pressure type magnetic head slider, and method of producing the same |
| 07/18/1990 | EP0378331A2 Servo circuit |
| 07/18/1990 | EP0378330A2 Servo circuit control system |
| 07/18/1990 | EP0378329A2 Servo circuit for magnetic disk apparatus |
| 07/18/1990 | EP0378328A2 Servo positioning circuit |
| 07/18/1990 | EP0378327A2 Automatic adjustment system for servo circuit of a magnetic disk apparatus |
| 07/18/1990 | EP0223804B1 Process for track jumping in track search processes and circuit arrangement for implementation of the process |
| 07/17/1990 | US4942609 Electronic flying integrity tester for disk drives |
| 07/17/1990 | US4942567 Disk reproducing method |
| 07/17/1990 | US4942565 Apparatus for recording a wobbling, spiral guide groove on an optical disc |
| 07/11/1990 | EP0377462A1 Magnetic disc file, thin film magnetic head and wafer for making thin film magnetic head |
| 07/11/1990 | EP0377056A2 Self loading head assembly for disk drives |
| 07/10/1990 | US4941062 Magnetic head positioning mechanism for magnetic disk device |
| 07/05/1990 | DE3943218A1 Automatic track locator for digital audio tapes - extracts pilot signals from head output to control head tracking value |
| 07/04/1990 | EP0376699A1 Transducer drive apparatus |
| 07/03/1990 | US4939714 Method for fading in and out reproduced digitally recorded data |
| 07/03/1990 | US4939712 Multiple track and reversing address search method for use in a disk player system |
| 07/03/1990 | US4939611 Vertical displacement limit stop in a disk drive for preventing disk surface damage |
| 07/03/1990 | US4939603 Magnetic head slider having a convex taper surface with the curvature facing a magnetic medium |
| 07/03/1990 | US4939600 Efficient head positioner power amplifier |
| 07/03/1990 | US4939599 Method and apparatus for measuring dynamic track misregistration |
| 07/03/1990 | US4938325 Vibration damping apparatus for pulse motor |
| 06/28/1990 | DE3941165A1 Steuersystem fuer den aufnehmer einer platten-wiedergabeeinrichtung Control system for the transducer a plate-reproducing device |
| 06/27/1990 | EP0374163A1 Magnetic recorder/player device with stationary recording medium |
| 06/26/1990 | US4937803 Track acquisition apparatus and method with specified velocity pattern |
| 06/26/1990 | US4937695 Recording and/or reproducing apparatus |
| 06/26/1990 | US4937693 Staggered heads for minimizing disk spacing in a disk drive |
| 06/26/1990 | US4937692 Crash stop for magnetic disk drive |
| 06/26/1990 | US4937688 Gain margin detector for a memory unit utilizing a servo control loop |
| 06/26/1990 | US4937510 Control apparatus for a linear motor for driving a pickup |
| 06/26/1990 | US4937438 Magnetic encoding apparatus and method |
| 06/19/1990 | US4935917 Memory disk having some capacity recording areas on a spiral track |
| 06/19/1990 | US4935916 Apparatus for recording and reproducing information including energy storing means |
| 06/19/1990 | US4935912 Circuit for digitally generating a tracking error signal to avoid offset monitoring |
| 06/19/1990 | US4935835 Magnetic media containing reference feature and methods for referencing magnetic head position to the reference feature |
| 06/19/1990 | US4935828 Seek multitasking disk controller |
| 06/19/1990 | CA1270558A1 Digital velocity control for a disk drive servo system |
| 06/14/1990 | WO1990006574A1 A magnetic recording head having i-bar core structure |
| 06/13/1990 | EP0372990A2 Magnetic recording apparatus |
| 06/13/1990 | EP0372953A2 Method of, and apparatus for detecting access speed for a disc player |
| 06/13/1990 | EP0372684A2 Data storage apparatus |
| 06/12/1990 | US4933922 Apparatus for generating a tracking error signal |
| 06/12/1990 | US4933795 Floppy disc read and write head having two separate read and write cores for multiple track density and recording frequencies |
| 06/12/1990 | US4933791 Head arm flexure for disc drives |
| 06/12/1990 | US4933786 Fault tolerant index patterns and decoding means |
| 06/12/1990 | US4933785 Disk drive apparatus using dynamic loading/unloading |
| 06/12/1990 | US4933784 Automatic head position tracking system for video signals recorded in a segmented format |
| 06/06/1990 | EP0371778A2 Automatic tracking apparatus |
| 06/06/1990 | EP0371777A2 Magnetic disk drive |
| 06/05/1990 | US4932019 Disk player having a vibration dissipating device |
| 06/05/1990 | US4932013 Apparatus for reading an optical disk which controls track jumping accurately and stably |
| 06/05/1990 | US4931889 Method and apparatus depending on the selected power source for controlling the positioning of a recording/reproducing apparatus |
| 06/05/1990 | US4931888 Tracking servo control for disc drive |
| 06/05/1990 | US4931887 Determining the vertical spacing |
| 06/05/1990 | US4931338 Test disk having fluorocarbon resin asperities for magnetic disk drive component testing |
| 05/31/1990 | WO1990005974A1 High density disc drive with magnetic clutch and a removable cartridge |
| 05/31/1990 | WO1990005961A1 Magnetic encoding apparatus and method |
| 05/31/1990 | DE3939670A1 Follower system for centre of magnetic disc tracks - has linear interpolation process to maintain head at centre of track |
| 05/29/1990 | US4930114 Track jump operation control apparatus in a disk player |
| 05/29/1990 | CA1269753A1 Method and means for parking read/write heads in a disc drive using the back- emf of the spindle motor to operate a stepper motor |
| 05/23/1990 | EP0369735A2 Low profile voice coil actuator for use in an optical data storage device |
| 05/23/1990 | CA2003897A1 Magnetic encoding apparatus and method |
| 05/22/1990 | US4928196 Magnetic recording device using circumferentially offset heads with double sided media |
| 05/22/1990 | US4928195 Improved floating magnetic head for high density recording |
| 05/17/1990 | WO1990005361A1 Disk drive servo control system |
| 05/17/1990 | WO1990005360A1 Voice coil activated disk drive parking device with magnetic bias |
| 05/17/1990 | WO1990005359A1 Magnetic parking device for disk drive |
| 05/17/1990 | WO1990005280A1 Dual reference track scheme |
| 05/16/1990 | EP0368269A2 Magnetic media containing reference feature and methods for referencing magnetic head position to the reference feature |
| 05/16/1990 | EP0368268A2 Carriage assembly for high track density flexible magnetic disk drive |
| 05/15/1990 | US4926405 High-speed search method for use in a disc player system |
| 05/15/1990 | US4926404 Disk playing method for disk player |
| 05/15/1990 | US4926275 Magnetic head carriage mechanism for a magnetic disk |
| 05/15/1990 | US4926082 Superconductor devices for disk drives |
| 05/14/1990 | CA2002744A1 Low profile voice coil actuator for use in an optical data storage device |
| 05/14/1990 | CA2000477A1 High density disk drive with magnetic clutch and a removable cartridge |
| 05/09/1990 | EP0367510A2 Apparatus and method for near contact magnetic recording |
| 05/09/1990 | EP0367440A2 Automatic head position tracking system for video signals recorded in a segmented format |
| 05/08/1990 | US4924333 Seek control apparatus and method for preventing head in a floppy disk apparatus from being outwardly moved beyond an outermost track |
| 05/08/1990 | US4924160 Staggered seeking method for disk drive sector servo |
| 05/08/1990 | CA1268858A1 Adaptive control technique for a dynamic system |
| 05/08/1990 | CA1268857A1 Digital servo control system for a data recording disk file |
| 05/02/1990 | EP0366291A2 Disc player with manual search function |
| 05/02/1990 | CN1007845B Optical record carrier and apparatus for reading record carrier |
| 05/01/1990 | US4922356 Transducer supporting apparatus and disk storage unit |
| 05/01/1990 | US4922160 Impedance load driving circuit |
| 04/26/1990 | DE3934868A1 Magnetic disc drive unit - has multiple heads on arms moved radially across disc by moving coil actuator |
| 04/25/1990 | EP0365306A1 Disc recording apparatus |
| 04/25/1990 | EP0365151A2 Limit stop in a disk drive for preventing disk damage |
| 04/25/1990 | EP0365150A2 Staggered heads for minimizing disk spacing in a disk drive |
| 04/25/1990 | CN1041662A Device for scanning record carrier and control circuit for use in such device |
| 04/24/1990 | US4920462 Disc drive fine servo velocity control and method for head positioning relative to a disc |
| 04/24/1990 | US4920438 Magnetic head unit and method of manufacturing the same |
| 04/24/1990 | US4920434 Fixed disk drive |
| 04/24/1990 | US4918972 Dual reference track scheme |
| 04/19/1990 | WO1990004252A1 Single stage seek method |
| 04/18/1990 | EP0364263A2 Disk file including suspension assembly mounting means |