Matches 451 - 500 out of 548 < 1 2 3 4 5 6 7 8 9 10 11 >
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4551776 Automatic reference adjustment for position error signal on disk file servo system  
A servo system which generates a position error signal (PES) provides for periodically calibrating the magnitude of the PES to increase or decrease its magnitude as required by modifying the gain...
4546395 Differential signal decoders  
A self-scaling differential signal decoder which accepts first and second input signals and provides an output representative of the difference therebetween which output is scaled as if the sum of...
4541083 For jumping a light spot on a track of a recording medium  
In a light spot control signal generating device, a light spot is irradiated on a recording medium having tracks on which information is recorded. In order to jump the light spot from a track being...
4539607 Servo track configuration for magnetic disk apparatus  
A servo track configuration has a plurality of magnetized unit regions provided on the servo sectors of a magnetic disk so that they may be sequentially disposed in four positions predetermined on...
4531167 Servowriter system for magnetic disc drives  
A portable servowriter system for writing a closed clock track and servo tracks on one or more of the fixed discs of a fixed disc magnetic disc drive without the aid of a mechanical head...
4524397 Head positioning system for a disc data store  
In a disc data store, wherein a read/write head is radially positionable by a feedback servomechanism to interact with a selectable one out of a plurality of radially equispaced data storage tracks...
4519007 Servo-track position detection systems  
A servo track position detection system overcomes the measurement errors induced by the use of decoders employing two separate signal measuring circuits where the difference between the outputs of...
4516177 Rotating rigid disk data storage device  
An improved rotating disk data storage device is achieved in a combination of an optical encoder to detect data track crossings, a servo sector surface on one of a plurality of rotating data...
4514773 Circuit arrangement for generating an actuating signal for a piezo-electric element of a positioning device  
A circuit arrangement for generating an actuating voltage for a piezo-electric element (1) of a positioning device intended for positioning a recording and/or reproducing head relative to an...
4513333 Diagnostic recording  
A diagnostic recording, readable by a computer system for enabling a user without special knowledge, software, or equipment to check, isolate and identify hardware malfunctions within the system,...
4513332 Disk drive having fine and coarse control of the read/write head  
A disk drive having a head actuator that is capable of quick, fine adjustments in position of the transducing head in order to precisely follow data tracks. A magnetic read/write head (2) is...
4513331 Method and apparatus for disk drive alignment  
A method and apparatus for checking performance and alignment of a disk drive designed for use with a floppy disk having a motor driven linear positioning mechanism for locating the read/write...
4499510 Precision alignment system for information storage devices  
A method is disclosed for accurately registering read-write heads on a magnetic storage medium. It includes the steps of ascertaining fractional departures of track locations from the nominal...
4498129 Method and apparatus for normalizing servo-positioning signals  
Analog servo-positioning signals transduced from a recorded member, such as embedded servo signals recorded on a disc memory or the like, which are to be compared to one another in order to derive...
4489259 Method and apparatus for controlling a stepper motor  
A method and apparatus for controlling a stepper motor and a disk drive is described for minimization of stepper motor oscillations for a single step, minimizing the time taken for the stepper...
4488187 Servo control apparatus  
Servo control apparatus including a recording head to read first and second servo data bytes stored across a track on opposite sides of a track centerline, a servo demodulator to count the first...
4486795 Disc drive servo system  
A disc drive servo system for controlling the drive of a disc carrying a binary digital signal wherein the digital signal includes (i) an information signal portion in which the position of an...
4485418 System and method of locating the center of a track on a magnetic storage disk  
A system and method of accurately locating the center of a previously recorded magnetic track on a rotating magnetic storage disk and moving a transducer to the center of the track. The system...
4480217 Automatic velocity calibrator for a velocity servo loop in a magnetic disk drive  
An automatic velocity calibrator for a head positioning servo system in a magnetic disk drive performs a velocity calibration in a single pass over the magnetic disks by measuring actuator velocity...
4479177 Servomechanisms  
A servomechanism avoids load-damaging conditions by being shut down whenever a power-amplifier saturation detector fails to detect a change in the saturation state of the power amplifier in...
4477849 Magnetic disc drive head alignment system  
A system is provided for aligning the read/write magnetic heads in a multi-head disc drive which includes a four quadrant balanced circuit and which responds to the peak amplitudes of dibits...
4445153 Method of correcting track misalignment of floppy disc and apparatus therefor  
A read/write head is fed to the location over a desired track by a usual access operation. Subsequently, the head undergoes an incremental movement from a base point where the head has been...
4445144 Method for detecting eccentricity in a video disc and in a video disc player  
A method for detecting and measuring eccentricity in a video disc and a video disc player, in which a video signal representing a special eccentricity test pattern is recorded on a prescribed set...
4419701 Data transducer position control system for rotating disk data storage equipment  
Improvements in a system for controlling the position of a head carriage structure of a rotating disk data storage system are disclosed. The improvements include circuitry for generating a...
4419700 Dual-track spiral recording and associated system  
Techniques and associated apparatus for a magnetic disk transducing system adapted to record along spiral tracks in a Herringbone pattern, using a pair of orthogonal skew gaps, operating in tandem....
4414655 Scanning beam control system  
A control system for use in controllably adjusting a prescribed characteristic of a beam scanning a record medium. In the preferred embodiments, the control system is embodied in a tracking...
4414590 Media interchange switch for magnetic disk drives  
A magnetic disk drive has a media interchange switch which interconnects the two head/disk drive assemblies with the two electronic systems in the drive. A manually operated switch on the operator...
4398228 Method of avoiding resonance in servo controlled apparatus  
An improved disk drive for storage of digital data is disclosed featuring a servo circuit used to drive the read/write head back and forth with respect to the media, the motion of the head being...
4396960 Servo track following control for magnetic heads, and method for compensating uniform disturbance variables  
For the servo track control of magnetic heads over magnetic tracks, in addition to the main servo position signals arranged in offset fashion to the middle of the track, auxiliary servo position...
4384309 Closed loop servo demodulator for positioning a servo head  
An improved servo demodulator channel employing a transconductance balanced modulator as a polarity switch, an AGC amplifier and a signal separation circuit. A transconductance balanced modulator...
4380034 Track centering servo pulse noise filter  
A track centering servo pulse noise filter is provided. Prerecorded pulses on a disk track's even and odd half tracks are sensed by the disk's read head, preamplified, DC biased, peak detected, and...
4378519 Transducer system with increased tracking capability  
The number of data tracks or positions that a transducer can access or track is increased, beyond that conventionally permitted by the transducer conductor spacing, by first providing a plurality...
4371960 Measurement of disc servo head/data head misalignment  
Compensation for radial misalignment between a data head and a servo head is provided. At least one pair of servo data tracks having a servo null there between are written on each data surface. The...
4371904 Flexible magnetic disk system  
A simple flexible magnetic disk memory system is provided which enables precise positioning of a read/write head to follow a data track, despite non-uniform expansion or contraction of the disk....
4326226 Constant bandwidth automatic gain control  
An improved automatic gain control circuit suitable for use in the servo loop controlling the position of magnetic read/write heads with respect to magnetic disk data storage media is disclosed....
4321636 Cateye-signal intercept detector for aligning a read-write head above a computer data storage disk  
A cateye-signal intercept detector for aligning a read-write head above a computer data storage disk. The detector used in conjunction with a standard disk having two adjacent cateye-type head...
4318144 Flexible magnetic disk recording apparatus  
An apparatus for recording binary information on a flexible magnetic disk of small dimension, comprises a rotatable hub connected to a plate on a first surface of which is formed a spiral guide....
4310914 Skipper-assisted active search  
Apparatus in a video disc player for previewing or scanning information on a record disc. A position sensor detects the position of a playback stylus relative to the carriage assembly for...
4310912 Servo system for recording and/or reproducing apparatus using a rotatable recording carrier  
In a recording and/or reproducing apparatus having a rotated record carrier, for example, in the form of a disc, adapted to have video or other signals optically recorded in successive turns of a...
4291346 Optoelectronic system for determining the position of a magnetic head transducer on a flexible magnetic recording disc  
An information storage system for recording data on a flexible magnetic recording disc is provided. The information storage system includes an optoelectronic system for determining the position of...
4280024 Selectively damped video disc stylus assembly  
A stylus assembly for damping impulsive radial motion of the stylus during playback of a grooved video disc record. Included in the stylus assembly is a moment arm perpendicularly attached at the...
4271442 Plane magnetic recording medium  
A plane magnetic recording medium comprises a data track traced by a magnetic head wherein said data track is initiallized to have each width smaller than a width of the trace of the magnetic head...
4253126 Linear tracking arm assembly  
A linear tracking arm assembly for linearly tracking a recording medium such as an audio or video disc, in which a tracking arm is linearly moved by means of an electric linear motor assembly.
4238809 Servo track configuration for magnetic disk apparatus  
A servo track apparatus comprising at least one unit pattern area including 2n (n=2, 3, 4, . . . ) servo tracks T i (i=0, 1, . . . 2n-1) and 2n 2 flux transitions R jk (j=0, 1, . . . 2n-1; k=0,...
4223359 Flexible magnetic disk recording apparatus  
An apparatus for recording binary information on a flexible magnetic disk of small dimension, comprises a rotatable hub connected to a plate on a first surface of which is formed a spiral guide....
4194226 Rigid magnetic disc memory apparatus including open loop stepper-motor-driven read/write head  
A rigid magnetic disc memory apparatus for use with a data processing system. A magnetic read/write head is accurately positioned parallel and adjacent to the plane of a rigid magnetic disc with...
4169276 Drive circuit for controlling a movable magnetic head  
An improved drive circuitry for controlling the deflection of a bimorph comprising a pair of electrically poled piezo-ceramic elements bonded to a common substrate is disclosed which applies...
4164764 Magnetic head position reference system  
A position reference system is disclosed which provides an indication of the amount of mistracking of a magnetic head while the latter is stationed in its normal operating environment. The system...
4160268 Signal pickup device with tracking control and jitter compensation for a video disc  
A signal pickup device comprises a reproducing stylus for tracing a track on a rotary recording medium thereby to reproduce the information signal recorded thereon, a cantilever provided at a free...
RE29963 Servo system for reading from a disc-shaped record carrier containing signals coded in optical form  
Apparatus for reading a disc-shaped record carrier in which video and/or audio information is recorded in a preferably spiral track. This information is optically read by means of a beam of...
Matches 451 - 500 out of 548 < 1 2 3 4 5 6 7 8 9 10 11 >