Patents
Patents for G11B 19 - Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function (26,229)
03/1990
03/27/1990US4912581 Magazine for supporting a plurality of magnetic disc packs each housing a magnetic disc
03/27/1990US4912570 Recording and/or reproducing device
03/22/1990WO1990003031A1 Recording/reproducing apparatus
03/22/1990WO1990003029A1 Rotating positioning device for magnetic disk memories
03/22/1990DE3930607A1 Unterscheidungsvorrichtung zum genauen unterscheiden zwischen wiedergabearten eines aufgezeichneten videosignals Discriminating apparatus for accurately distinguish between types of playback of a recorded video signal
03/21/1990EP0359541A2 Optical-disk playback apparatus, method of optical-disk playback and combined memory medium
03/20/1990US4910722 Optical information recording and reproducing apparatus
03/20/1990US4910670 Sound generation and disk speed control apparatus for use with computer systems
03/20/1990US4910616 Servo track centering for magnetic disc read/write head
03/20/1990US4910479 Automatic gain control device for use in an optical memory device
03/20/1990CA1266877A1 Electronically commutated dc machine and use thereof
03/14/1990EP0357889A2 Demagnetization of thin film magnetic recording transducers utilizing a decreasing AC current
03/13/1990US4908812 Synchronizing signal reproducing circuit in a disc playback device
03/13/1990US4908810 Method and apparatus for controlling a spindle servo using pickup position and shift information
03/13/1990US4907897 Bearing device
03/13/1990CA1266719A1 Precision spindle
03/07/1990EP0357430A2 Multispeed reproducing control apparatus of a video disk player
03/07/1990EP0357419A2 Optical data recording and readout apparatus
03/07/1990EP0356984A2 Disc player
03/07/1990EP0356763A2 Apparatus and method of accessing a medium with low power consumption
03/07/1990EP0164131B1 Information recording medium disc and method and apparatus for recording/reproducing information
03/07/1990CN1040282A Reproducing and/or recording apparatus
03/06/1990US4907111 Locking device for floppy disk drives
03/06/1990US4907106 Head slider driving mechanism for a magnetic disk apparatus
03/06/1990US4907105 Synchronized spindle control for disk drives
03/06/1990US4907098 Information recording-reproducing apparatus
03/06/1990US4906874 Analog signal switching device for use in an optical memory
02/1990
02/28/1990EP0356201A2 Optical recording element and driving system
02/27/1990US4905110 Disk drive spindle motor
02/27/1990US4904938 Method and apparatus for testing characteristics of a floppy disc and a floppy disc drive
02/22/1990WO1990001772A1 Overwrite-type magnetooptical recording medium cartridge
02/22/1990WO1990001769A1 Overwrite type magnetooptical recording apparatus
02/22/1990WO1990001737A1 Single disk emulation for synchronous disk array
02/20/1990US4903157 Electromagnet-actuated head latching apparatus
02/20/1990US4903155 Disc drive
02/20/1990US4903140 Apparatus for reproducing signals from both sides of discs
02/20/1990US4902941 Drive motor for information-storage-disk devices
02/14/1990EP0354248A1 Device for driving a floppy disc
02/13/1990US4901300 Method of and apparatus for recording an information signal
02/13/1990US4901173 Apparatus for coupling record disk to disk drive
02/13/1990US4901170 Rotary head type digital signal reproducing method
02/13/1990US4901169 Data recording apparatus able to accurately access a floppy disk regardless of recording density
02/13/1990US4900958 Drive motor for magnetic disks, optical disks, and magneto-optical disks
02/13/1990US4900908 Card accessing apparatus having a head disposed under a card feeding stage
02/07/1990EP0353866A1 Compact magnetic fluid low pressure seal
02/07/1990EP0353852A2 Method and circuitry to suppress additive disturbances in data channels containing MR sensors
02/06/1990US4899331 Random reproducing system for disk player
02/06/1990US4899326 Magazine-housed disk player
02/06/1990US4899237 Divided housing for supporting magnetic disks
02/06/1990US4898480 Compact ferrofluidic electrically conducting sealed bearing
02/01/1990DE3920504A1 Magnetic head
01/1990
01/31/1990EP0352728A2 DC motor stop detector and DC motor brake apparatus
01/30/1990US4897746 Magnetic head device
01/30/1990US4897740 Recording/reproducing system for a magnetic recording medium including synchronization detecting circuit
01/30/1990CA1265241A1 Disk drive positioning system providing passive head crash protection
01/25/1990WO1990000771A1 Data security device
01/24/1990EP0352214A2 D.C. motor
01/24/1990CN1039162A Phase-control circuit
01/23/1990US4896311 Disk apparatus
01/23/1990US4896232 Chucking mechanism for floppy disk drive
01/23/1990US4896226 Multi-motor electronic still camera having recording disk, focal plane shutter, and optical filters
01/18/1990DE3914128A1 Multi-compartment magazine record player
01/16/1990US4894817 Method of writing data on optical card by projecting thereon intensity modulated light beam
01/16/1990US4894814 Optical disc player with pause function in response to elapsed preset maximum playback time period
01/16/1990US4894738 Disk storage drive
01/16/1990US4894525 Optical power control device for semiconductor light emitting element
01/11/1990WO1990000337A1 Image storage and retrieval apparatus
01/11/1990WO1990000300A1 Seeking multitasking disk controller
01/11/1990DE3921982A1 Protective circuit for optical disc players
01/11/1990DE3914239A1 Einrichtung zum schutz von daten Means for protection of data
01/09/1990US4893293 Method for operating multidisk player
01/09/1990US4893200 Composite magnetic head
01/09/1990US4893193 Disc recording medium and apparatus for playback thereof
01/09/1990US4892423 Rotary actuator and fabrication process therefor
01/09/1990US4892418 Hydrodynamic bearing device
01/03/1990EP0349279A2 Arrangement of recording/reproducing apparatus
01/02/1990US4891727 Memory device
12/1989
12/28/1989WO1989012889A1 Magnetooptical recording apparatus
12/27/1989EP0348197A2 Linear motor locking mechanism in a disc unit
12/27/1989EP0348027A2 Magneto-resistive sensor with opposing currents for reading perpendicularly recorded media
12/27/1989EP0347858A2 Optical disc and recording and reproducing apparatus employing the optical disc
12/27/1989CN1006258B Control method and circuit for starting the optical disc playback system
12/26/1989US4890276 Optical disc player
12/26/1989US4890272 Apparatus for correcting photodetector signals in a system for retrieving information from an optical recording medium
12/26/1989US4890174 Rotary voice coil micro-hard disk drive system
12/26/1989US4890045 Spindle motor control system for magnetic disk apparatus
12/20/1989EP0346979A2 Reproducing and/or recording apparatus
12/20/1989EP0346664A1 Phase-controlling loop
12/19/1989US4888756 Optical information recording and reproducing apparatus
12/19/1989US4888751 Image information processing apparatus
12/18/1989WO1989012932A1 Phase-control circuit
12/14/1989DE3918953A1 External rotor motor without a commutator
12/13/1989EP0346063A2 Magneto-optical information recording method and apparatus
12/13/1989EP0346052A2 Timer apparatus
12/13/1989EP0345917A2 Apparatus and method of stop control for a spindle motor
12/13/1989EP0345556A1 Counter circuitry for motor rotation speed control circuitry
12/13/1989EP0221097B1 Elastic support system with adjustable shock absorption for record players
12/13/1989CN1006100B Electro-optical device
12/12/1989US4887254 Optical disk drive device for positioning a carriage to a retract position
12/12/1989US4887253 Scanning method and apparatus for performing track jump operations in disk player