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4149200 |
Transducer positioning system
Principal embodiment teaches method and apparatus for radial positioning of a magnetic recording transducer relative to the concentric tracks of a rotatable magnetic disk having work data and servo...
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4131924 |
Flexure mounted magnetic head positioner for high-speed translation
Data is recorded on a magnetic recording disk with data transducers adjustably positioned relative to respective "data zones," each zone comprising a prescribed number of adjacent data tracks. A...
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4130844 |
Method and means for tracking magnetic tracks
In a tracking system using an error signal derived from recorded dipulses of opposing polarity on each side of the center of a data track recorded on a magnetic medium, the need for highly accurate...
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4115823 |
Track following servosystem for data storage apparatus
A data storage apparatus, such as an accessing head magnetic disk file, includes at least one data disk surface and a servo disk surface. In operation, a continuous position signal having high...
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4092683 |
Dual-mode demodulator for movement of a servo head
An improved demodulator principally for receiving dibits from a servo track and generating a position error signal responsive to the servo head position relative to the track as indicated by the...
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4092682 |
Cross coupled demodulator for generating a servo head position error signal
An improved demodulator principally for receiving dibits from a servo track and generating a position error signal responsive to the servo head position relative to the track as indicated by the...
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4087842 |
Recording track eccentricity compensation method and means
Playback method and apparatus compensate exactly for both tracking and speed errors due to any eccentricity in the information track on a rotating recording member during playback by moving the...
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4085427 |
Transducer positioning system
A transducer positioning system wherein a pair of position information signals are first processed by means which tend to equalize the offset errors in each, the signals then being further...
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4084201 |
Magnetic disc, especially a flexible magnetic disc, for track adjustment and amplitude control
The invention relates to a magnetic disc for track adjustment and amplitude control having at least one control track with magnetic control signals, this track being arranged in the central region...
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4075667 |
Method and apparatus for aligning read/write heads in a disc recorder
In a magnetic disc recorder utilizing a servo head to generate a feedback signal for the positioning of the heads on the recording disc, a method for aligning the read/write heads with the servo...
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4072990 |
Servo positioning system for data storage apparatus
Data track positioning information for data tracks on a stack of recording disks is provided by servo information pre-recorded on one surface of the stack. In addition, each data track on the...
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4056831 |
Thermal compensation for disk pack systems
A temperature compensation technique for memory disk pack systems used in data processing apparatus wherein the temperatures at the base plate and at the disk pack are monitored so as to generate a...
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4053937 |
Calibration timing bands
A method of preparing an alignment disc pak in which first and second signals of different frequencies f1 and f2 are recorded in eccentric bands at a selected track on the disc such that the...
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4012777 |
Record carrier and device for playing back same
A recording device for storing and playing back information in which mechanical deformations which are representative of the stored information are provided in the surface of a record carrier...
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3994016 |
Head positioning servo system for disk drives
A closed loop head positioning servo system is disclosed for use in a disk drive employing a disk pack having a dedicated servo surface and a number of data surfaces carrying both data and servo...
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3969574 |
Tubular player arm for an optical recording and reproducing device with drive coil and tachogenerator coil on other end
A device for writing information in a disk-shaped record carrier, and/or for reproducing the recorded information, the transducer being radially movable relative to the record carrier, which...
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3962724 |
Method of and device for testing movable magnetic heads for ability to trace a predetermined spiral magnetic track without deviating therefrom
A method of and a device using a testing sheet having magnetically recorded thereon a magnetic head deviation detection signal formed on a portion of a predetermined spiral magnetic track or on a...
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3959820 |
System for increasing the number of data tracks in a magnetic recording system
A system is provided for positioning a transducer over a magnetic media by the sensing of previously recorded information. The previously recorded information is in the form of a plurality of...
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3953889 |
Electronic head adjust system for removable magnetic discs
Means for making field alignment of transducers with reference tracks prerecorded on a master disc comprising a source of regulated voltage, a separate potentiometer associated with each selected...
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3914791 |
Memory unit flying pad linkage
A disc drive information storage unit is disclosed having a fixed operative position head mount coupled flying pad and a linear motor responsive reciprocative head mount coupled flying pad and in...
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3911211 |
Stop frame for optical playback system
An optical playback system for reading video discs with a laser beam has a radial servo including an arrangement for developing a correction signal representing the sense and extent of deviations...
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3872241 |
Video disc pickup with capacitive tracking
The electrostatic pick-up system is used for deriving signals which represent video program information stored on a video disc and are suitable for application to a television receiver to reproduce...
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3869721 |
Recovery of normally illegible, magnetically recorded information
Illegible information recorded along a track of a magnetic record medium is recovered by relatively moving the read head from its normal position at the approximate center of the track to a new...
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3854015 |
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...
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3840893 |
TRACK FOLLOWING SERVO SYSTEM
A movable member, such as a random access disc file, has signals impressed on a disc surface in the form of concentric tracks alternately recorded at first and second frequencies. A transducer...
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3818502 |
AUTOMATIC HEAD WIDTH CORRECTION
The invention relates to means for compensating for variations in the effective head gap width of a servo transducer used in a track following servo system and more specifically used within the...
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3789378 |
TRANSDUCER POSITIONING MECHANISM
In a magnetic disc store system, transducers are positioned over tracks on the discs by a stepping motor controlled by a central unit which sends signals over three channels commanding first and...
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3775655 |
METHOD AND APPARATUS FOR TRANSDUCER TEMPERATURE COMPENSATION
Method and apparatus for compensating a position servomechanism for errors introduced by differences in coefficients of thermal expansion between a transducer element and a positioned element. A...
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3772665 |
SYSTEM FOR LOADING AND POSITIONING A TRANSDUCER IN A DATA STORAGE DISC CARTRIDGE
A disc cartridge has a cutout at its periphery and a rigid interior plate that overlies the rotating disc. The plate has flat guide surfaces that straddle a slot extending from adjacent the opening...
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3753254 |
THERMAL EXPANSION COMPENSATION FOR DISC DRIVE MEMORY
Apparatus for a disc drive memory is described for continuously compensating for the effects of thermal expansion on the positioning of read/write heads with respect to a disc pack. The apparatus...
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3742470 |
MEMORY DISC PACK DRIVE HAVING ACCURATE READ/WRITE HEAD POSITIONING
An apparatus is described which is incorporated into a memory disc pack drive mechanism to enable each read/write head thereof to be properly positioned with respect to corresponding disc pack...
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3702997 |
HEAD LOADING SYSTEM FOR MAGNETIC MEMORY DISK DRIVES
A head loading system for a disk drive where levers extend from the support fingers of each of the read/write heads which are coupled to a radially movable carriage. The levers are capable of being...
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3691543 |
POSITIONING SYSTEM INCLUDING SERVO TRACK CONFIGURATION AND ASSOCIATED DEMODULATOR
The invention relates to a positioning system which provides a series of adjacent servo tracks, the boundary between adjacent servo tracks defining a path for the servo system to follow. The servo...
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3597750 |
SERVO WITH AGC FOR POSITIONING A MAGNETIC HEAD
Apparatus for maintaining an array of read/write heads in position at a given track location on a stack of rotating discs, including: a photoelectric transducer for producing two alternating...
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3590222 |
RECORD STORER UTILIZING HYDRAULICALLY ACTUATED MEANS FOR POSITIONING THE WRITING AND READING HEADS THEREOF
A record storer with selective control of the positioning or setting of the writing and reading heads thereof relative to the recording tracks of the recording carriers thereof, in which movement...
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3534344 |
METHOD AND APPARATUS FOR RECORDING AND DETECTING INFORMATION
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3531789 |
TEMPERATURE COMPENSATION FOR DATA STORAGE DEVICE
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3491347 |
SERVO SYSTEM FOR POSITIONING TRANSDUCERS AT TRACK LOCATIONS
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3449734 |
POSITIONING APPARATUS FOR A RANDOM ACCESS STORAGE DEVICE USING A DUAL-FREQUENCY REFERENCE TRACK
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3425047 |
MAGNETIC TRACE RECORDER WITH TRACE-FOLLOWING HALL EFFECT READOUT HEAD
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3399391 |
Holding circuit for servo mechanism
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3343148 |
Transducer positioning circuit
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3292168 |
High resolution, head positioner system
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3234443 |
Analogue signal delay device
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3023404 |
Magnetic drum head positioning system
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2925238 |
Positioning mechanism
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3593331 |
Title is not available
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3562725 |
Title is not available
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