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Class Information
Number: 360/77.02
Name: Dynamic magnetic information storage or retrieval > Automatic control of a recorder mechanism > Controlling the head > Track centering > Rotary carrier
Description: Subject matter which controls a transducer centering position relative to a circular revolving medium.

Sub-classes under this class:

Class Number Class Name Patents
360/77.04 By memory storage of repeatable error or correction 625
360/77.03 By nonmagnetic sensing (e.g., optical, capacitive) 253
360/77.05 By servo signal component from carrier surface separate from information signal bearing surface 199
360/77.07 By tracking signal recorded on or immediately beneath surface 234
360/77.06 Reproduced data signal used for tracking 198

Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14

Patent Number Title Of Patent Date Issued
5062023 Disk file servo loop with improved track settling Oct. 29, 1991
5053899 Exact position control of a relative position between a magnetic head and a recording medium Oct. 1, 1991
5050016 Disk drive servo system using gain limited high-frequency track-following compensator Sep. 17, 1991
5041927 Magnetic disc driving apparatus having speed and position control Aug. 20, 1991
5027233 Method for determining servo position data in a disk drive Jun. 25, 1991
5023732 Magnetic disk apparatus having a circuit for detecting the position of servo information recorded on a magnetic disk Jun. 11, 1991
5015932 Actuator driving circuits May. 14, 1991
5010535 Apparatus and process for measuring data disk runout and acceleration parameters Apr. 23, 1991
4989103 Adjustment of position slope for disk drive servo using half-track point Jan. 29, 1991
4980783 Apparatus for automatically applying servo track data to a selected servo surface of a hard disk within a hard disk assembly Dec. 25, 1990
4955010 Constant velocity track jump servo system for disc players Sep. 4, 1990
4940924 Positioning control apparatus Jul. 10, 1990
4933785 Disk drive apparatus using dynamic loading/unloading Jun. 12, 1990
4928192 Process for identifying disks and automatically configuring a disk drive system May. 22, 1990
4912572 Magnetic disk drive with effective AGC control of servo signals by selectively varying A/D converter reference level Mar. 27, 1990
4910616 Servo track centering for magnetic disc read/write head Mar. 20, 1990
4908561 Servo amplifier circuit Mar. 13, 1990
4905109 Process for optimizing head position to overcome disk misclamping and imperfections Feb. 27, 1990
4904938 Method and apparatus for testing characteristics of a floppy disc and a floppy disc drive Feb. 27, 1990
4897590 Track access apparatus in a magnetic recording/playback system Jan. 30, 1990
4862294 Disc erasing apparatus for selective erasure of disc tracks Aug. 29, 1989
4858040 Bimorph actuator for a disk drive Aug. 15, 1989
4851939 Actuator driving apparatus and magnetic disk drive system with a smaller number of high power amplifiers than actuators Jul. 25, 1989
4839751 Track-following servo for disk drive with multiple reference windows and time dependent logic circuitry Jun. 13, 1989
4835632 Disk file digital servo control system with multiple sampling rate May. 30, 1989
4825313 Method for adjustably positioning a transducer for a disc drive Apr. 25, 1989
4819093 Rotary magnetic recording-reproducing apparatus with disc track checking Apr. 4, 1989
4814908 Thermo servo for track centering on a disk Mar. 21, 1989
4811139 Device for recording and reproduction having head moving means Mar. 7, 1989
4808900 Bi-directional difference counter Feb. 28, 1989
4797756 Method for positioning head in disk drive deriving "position" offset from "quadrature" signals Jan. 10, 1989
4794579 Circuit for remote-scanning audio or video disk player for contactless scanning with coarse and fine drive mechanisms for radial servo readjustment Dec. 27, 1988
4794469 Recorded data reproducing apparatus Dec. 27, 1988
4780778 Device for adjusting a sensor at a reference position corresponding to a reference track position of a read/write head Oct. 25, 1988
4777417 Head position control system for a disc storage unit Oct. 11, 1988
4764860 Servo circuit for an information recording and/or reproducing apparatus Aug. 16, 1988
4761692 Method and apparatus for data recording disc playback Aug. 2, 1988
4757394 Auto-tracking apparatus of a magnetic recording/reproducing apparatus Jul. 12, 1988
RE32709 Tracking system for video disc player Jul. 5, 1988
4720754 Digitally responsive system for positioning a transducer of a storage apparatus Jan. 19, 1988
4716481 Recording and/or reproducing apparatus having an imposed head shifting feature Dec. 29, 1987
4710832 Tracking system for rotary magnetic recording medium using weighted sampled track values Dec. 1, 1987
4707648 Focus servomechanism control system of optical disc system having offset setting means Nov. 17, 1987
4700249 Magnetic transducer head capable of proper data transfer contact with a flexible magnetic disk without fine adjustment Oct. 13, 1987
4697213 Index servo type magnetic head positioning control apparatus and method thereof Sep. 29, 1987
4691258 Temperature compensating mechanism for positioning of a magnetic head of a magnetic disk drive Sep. 1, 1987
4677506 Tracking apparatus for rotational magnetic recording medium with envelope level correction Jun. 30, 1987
4656538 Disk drive control system Apr. 7, 1987
4642704 Video signal reproducing apparatus using pilot signal system Feb. 10, 1987
4642541 Track following servo for higher density disk files Feb. 10, 1987

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