Matches 401 - 450 out of 548 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
4908561 Servo amplifier circuit  
A servo amplifier circuit, wherein a target value is obtained based on a detected output voltage of the servo amplifier circuit, and the absolute value of the target value is amplified, and then is...
4905109 Process for optimizing head position to overcome disk misclamping and imperfections  
A process allows a disk drive system to optimize head position in order to minimize the effects of track variations due to disk misclamping and imperfections. The process utilizes a transducer head...
4904938 Method and apparatus for testing characteristics of a floppy disc and a floppy disc drive  
Method and apparatus for determining the alignment of a data track on a magnetic disc, for example a floppy disc and for determining the alignment of a read/write head in disc drive writing...
4897590 Track access apparatus in a magnetic recording/playback system  
Disclosed is an apparatus for gaining high-speed random access to a track in a magnetic recording/playback system of the type in which a magnetic head is shifted to an adjacent track in response to...
4862294 Disc erasing apparatus for selective erasure of disc tracks  
In an electronic still camera system, a plurality of circular tracks are performed on a magnetic disc and the magnetic head 1 is used for both reproduction and erasing of the disc. When any one of...
4858040 Bimorph actuator for a disk drive  
A movable actuator supporting a stacked assembly of read/write heads for unitary movement adjacent respective disk surfaces of a disk drive mechanism, the movable actuator incorporating a series of...
4851939 Actuator driving apparatus and magnetic disk drive system with a smaller number of high power amplifiers than actuators  
In a magnetic disk drive apparatus having a plurality of actuators, or a magnetic disk drive system constructed of a plurality of head disk assemblies (HDA's); a magnetic disk drive apparatus or...
4839751 Track-following servo for disk drive with multiple reference windows and time dependent logic circuitry  
Disclosed is a Fine positioning arrangement for track-follow servo means in a disk drive arrangement wherein servo head output is processed logically to indicate violation by the head of a...
4835632 Disk file digital servo control system with multiple sampling rate  
A digital servo control system in a data recording disk file has a single processor which generates the control signal to the actuator at two different rates, depending on whether the read/write...
4825313 Method for adjustably positioning a transducer for a disc drive  
A method of adjusting the position of a magnetic head in a magnetic head positioning mechanism positions the magnetic head at a target track on a magnetic disk. Since a floppy disk system is so...
4819093 Rotary magnetic recording-reproducing apparatus with disc track checking  
A rotary magnetic recording-reproducing apparatus in an electronic camera system, wherein a subject is purely electronically still-photographed and recorded on a rotating magnetic disc, and the...
4814908 Thermo servo for track centering on a disk  
An apparatus and method for positioning a transducer over the center of a track is disclosed. An arm carries the transducer. Embedded in the arm is a heating element. The heating element is...
4811139 Device for recording and reproduction having head moving means  
A device for recording and reproduction having a recording and reproducing head, a disk driving mechanism, a head moving mechanism for moving the head relative to the medium, a manual actuator to...
4808900 Bi-directional difference counter  
Disclosed is a servo control system for a disk drive actuator using a bi-directional (Up/Down) Difference Counter along with a control circuit therefor which signals the counter each time a "rest...
4797756 Method for positioning head in disk drive deriving "position" offset from "quadrature" signals  
For a disk drive servo system using position and position-quadrature signals (P, Q), a method for automatically effecting "Absolute Track Registration" and compensating for "offsets" by using the...
4794579 Circuit for remote-scanning audio or video disk player for contactless scanning with coarse and fine drive mechanisms for radial servo readjustment  
In order to obtain perfect scanning of audio and/or video disks through application of contactless scanning with a coarse and fine drive system for radial servo readjustment, the fine drive optimum...
4794469 Recorded data reproducing apparatus  
A recorded data reproducing apparatus according to this invention comprises a data pulse generation section, a peak detection section and a control section. The data pulse generation section reads...
4780778 Device for adjusting a sensor at a reference position corresponding to a reference track position of a read/write head  
A device for adjusting the position of a sensor corresponding to a predetermined reference track position of a read/write head with respect to a track on a magnetic disk, comprises a chassis, a...
4777417 Head position control system for a disc storage unit  
Lead wires are extended from phase coils of a head control motor, so that their effective reactances may be varied, and reactance selection circuits are additionally provided to switch values of...
4764860 Servo circuit for an information recording and/or reproducing apparatus  
A servo circuit for an information recording and reproducing apparatus such as a Compact Disc player detects relative mechanical vibrations of a pickup head with respect to a recording medium and...
4761692 Method and apparatus for data recording disc playback  
A method and apparatus for playback of a data recording disc which contains a CD area in which a signal such as an audio signal is recorded in digital form and a video area in which a FM-modulated...
4757394 Auto-tracking apparatus of a magnetic recording/reproducing apparatus  
An auto-tracking apparatus of a magnetic recording/reproducing apparatus has a circuit for discriminating whether the audio signals recorded on a magnetic tape to be reproduced were recorded by...
RE32709 Tracking system for video disc player  
A video disc player is described for use with a video disc having frequency modulated video information recorded thereon in the form of a plurality of concentric circles or a single spiral. The...
4720754 Digitally responsive system for positioning a transducer of a storage apparatus  
A servo system, for positioning a transducer of a rotatable storage apparatus over a servo tracks of a magnetic disc processes trains of positioning pulse signals. A reference voltage, changing...
4716481 Recording and/or reproducing apparatus having an imposed head shifting feature  
A recording or reproducing apparatus having a recording or reproducing head, a spring member, a reset member for charging the spring member, a carriage member for moving the recording or...
4710832 Tracking system for rotary magnetic recording medium using weighted sampled track values  
A tracking system for a rotary magnetic recording medium includes a magnetic head for sensing signals on a plurality of tracks formed on the recording medium such that a beginning and an end of...
4707648 Focus servomechanism control system of optical disc system having offset setting means  
A focus servomechanism control system in an optical disc is provided for controlling a light focusing unit to adjust a focus of light impinging on a track in a rotatable optical disc. The focus...
4700249 Magnetic transducer head capable of proper data transfer contact with a flexible magnetic disk without fine adjustment  
A flexible magnetic disk drive is disclosed which has a transducer head requiring little or no positional or angular readjustment for proper data transfer contact with a flexible magnetic disk in...
4697213 Index servo type magnetic head positioning control apparatus and method thereof  
According to the invention, a magnetic head positioning control apparatus using an index servo data has a circuit for determining a final correction value such that a magnetic head position...
4691258 Temperature compensating mechanism for positioning of a magnetic head of a magnetic disk drive  
A magnetic head actuator assembly for a disk drive, having dissimilar materials with different linear expansion coefficients, is provided with thermal compensation. The movable member of the...
4677506 Tracking apparatus for rotational magnetic recording medium with envelope level correction  
A tracking apparatus for a signal reproducing apparatus makes use of a rotating magnetic recording medium, especially when such apparatus reproduces information signals recorded on the medium, such...
4656538 Disk drive control system  
A disk drive control system includes servo sectors written on a disk, with each sector containing three sets of marker pulses arranged so that three adjacent marker pulses from each of the sets...
4642704 Video signal reproducing apparatus using pilot signal system  
A video signal reproducing apparatus comprises an error signal forming circuit (31) for providing an error signal (f) for tracking control and a movable head controlling circuit (34) for...
4642541 Track following servo for higher density disk files  
Described is a novel technique and associated arrangement for determining the noise-free value of a system parameter (e.g., head position in a disk drive) which is time variable and (usually) has a...
4638383 Micro hard-disk drive system  
A micro-Winchester disk drive system particularly suited to meet the demands of a portable computer system. The micro-Winchester disk is a Winchester disk of 85-100 mm in diameter. This disk drive...
4633334 Tracking control apparatus using digitized vertical synchronizing signal  
A tracking control apparatus for a disc reproducing apparatus comprises a circuit including a head for reproducing an FM video signal from a disc recorded with the FM video signal on concentric...
4628380 Encoder output phase selection system for magnetic disk memory  
A head positioning system for a magnetic disk memory to position the head over a reference track so that track seeking operations can proceed from a known reference location. A plurality of control...
4620253 Low mass actuator system for magnetic recording disk  
An actuator for a magnetic read/write head carried by a linear motor has its stator located between a pair of disks within a stack of magnetic recording disks. The stator comprises an array of...
4620244 Compensation method to correct thermally induced off-track errors in disc drives  
A thermal test tract is provided outside the user-accessible area on the disc. A tack complete of a known frequency is then written on the either side of this thermal test track, preferably half...
4613915 Twin track vertical magnetic recording servo control method and apparatus with offset voltage compensation  
This invention utilizes a sectored servo control having dual servo tracks recorded in the servo sector. In addition, the servo sector track portions have been recorded with two 180° flux reversals...
4608618 Digital alignment diagnostic disk  
An alignment disk including data tracks written in a spiral configuration, through the use of microstepping techniques, to accurately test a variety of transducer head parameters including head...
4584619 Programmable servo pattern generator  
A programmable servo pattern generator for use in a magnetic disc drive servowriter system. The servo pattern generator of the present invention stores a multiplicity of different servo patterns in...
4583135 Tracking device using multiple piezoelectric elements for track centering  
A tracking device comprises a frame having a pair of opposed legs, a magnetic head disposed midway between the pair legs and a pair of piezoelectric members sandwiching the magnetic head and...
4581567 Device for feeding magnetic head  
A device for feeding a magnetic head used in a magnetic disc apparatus, wherein phase currents of the pulse motor are controlled by sensing the signals that are produced in proportion to off-track...
4577244 Techniques for disk servo  
Described is a novel technique and associated arrangement for determining the noise-free value of a system parameter (e.g., head position in a disk drive) which is time variable and (usually) has a...
4568988 Micro hard-disk drive system  
A micro-Winchester disk drive system particularly suited to meet the demands of a portable computer system. The micro-Winchester disk is a Winchester disk of 85-100 mm in diameter. This disk drive...
4567535 Recording and/or reproducing apparatus  
A recording and/or reproducing apparatus is loaded with a recording medium which comprises a substantially cylindrical part, a hollow part at least open at one end thereof, and a recording surface...
4562562 Tracking system for controlling the radial positioning of a transducer on a disc medium  
A data track searching device capable of switching between two modes; one being the rough searching mode in which a transducer is displaced at a high velocity to a desired track and the other being...
4554600 Track following code and track following system  
A system for following a track on a moving data storage member having stored thereon a track following code. The code includes, on one side of the track centerline, a first area of magnetic flux of...
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  
Damaging head crashes are prevented in a disk drive system by providing a specially chosen RC network between the head position control servo and the head actuator. The values of the RC network are...
Matches 401 - 450 out of 548 < 1 2 3 4 5 6 7 8 9 10 11 >