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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
4638383 Micro hard-disk drive system Jan. 20, 1987
4633334 Tracking control apparatus using digitized vertical synchronizing signal Dec. 30, 1986
4628380 Encoder output phase selection system for magnetic disk memory Dec. 9, 1986
4620244 Compensation method to correct thermally induced off-track errors in disc drives Oct. 28, 1986
4620253 Low mass actuator system for magnetic recording disk Oct. 28, 1986
4613915 Twin track vertical magnetic recording servo control method and apparatus with offset voltage compensation Sep. 23, 1986
4608618 Digital alignment diagnostic disk Aug. 26, 1986
4584619 Programmable servo pattern generator Apr. 22, 1986
4583135 Tracking device using multiple piezoelectric elements for track centering Apr. 15, 1986
4581567 Device for feeding magnetic head Apr. 8, 1986
4577244 Techniques for disk servo Mar. 18, 1986
4568988 Micro hard-disk drive system Feb. 4, 1986
4567535 Recording and/or reproducing apparatus Jan. 28, 1986
4562562 Tracking system for controlling the radial positioning of a transducer on a disc medium Dec. 31, 1985
4554600 Track following code and track following system Nov. 19, 1985
4553181 Disk drive positioning system providing fault-free protection against endstop head crashes by use of a passive network in the actuator driving signal path Nov. 12, 1985
4551776 Automatic reference adjustment for position error signal on disk file servo system Nov. 5, 1985
4546395 Differential signal decoders Oct. 8, 1985
4541083 For jumping a light spot on a track of a recording medium Sep. 10, 1985
4539607 Servo track configuration for magnetic disk apparatus Sep. 3, 1985
4531167 Servowriter system for magnetic disc drives Jul. 23, 1985
4524397 Head positioning system for a disc data store Jun. 18, 1985
4519007 Servo-track position detection systems May. 21, 1985
4516177 Rotating rigid disk data storage device May. 7, 1985
4514773 Circuit arrangement for generating an actuating signal for a piezo-electric element of a positioning device Apr. 30, 1985
4513333 Diagnostic recording Apr. 23, 1985
4513331 Method and apparatus for disk drive alignment Apr. 23, 1985
4513332 Disk drive having fine and coarse control of the read/write head Apr. 23, 1985
4499510 Precision alignment system for information storage devices Feb. 12, 1985
4498129 Method and apparatus for normalizing servo-positioning signals Feb. 5, 1985
4489259 Method and apparatus for controlling a stepper motor Dec. 18, 1984
4488187 Servo control apparatus Dec. 11, 1984
4486795 Disc drive servo system Dec. 4, 1984
4485418 System and method of locating the center of a track on a magnetic storage disk Nov. 27, 1984
4480217 Automatic velocity calibrator for a velocity servo loop in a magnetic disk drive Oct. 30, 1984
4479177 Servomechanisms Oct. 23, 1984
4477849 Magnetic disc drive head alignment system Oct. 16, 1984
4445153 Method of correcting track misalignment of floppy disc and apparatus therefor Apr. 24, 1984
4445144 Method for detecting eccentricity in a video disc and in a video disc player Apr. 24, 1984
4419700 Dual-track spiral recording and associated system Dec. 6, 1983
4419701 Data transducer position control system for rotating disk data storage equipment Dec. 6, 1983
4414655 Scanning beam control system Nov. 8, 1983
4414590 Media interchange switch for magnetic disk drives Nov. 8, 1983
4398228 Method of avoiding resonance in servo controlled apparatus Aug. 9, 1983
4396960 Servo track following control for magnetic heads, and method for compensating uniform disturbance variables Aug. 2, 1983
4384309 Closed loop servo demodulator for positioning a servo head May. 17, 1983
4380034 Track centering servo pulse noise filter Apr. 12, 1983
4378519 Transducer system with increased tracking capability Mar. 29, 1983
4371960 Measurement of disc servo head/data head misalignment Feb. 1, 1983
4371904 Flexible magnetic disk system Feb. 1, 1983

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