Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1989-01-05
1990-07-03
Stephan, Steven L.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
G11B 3312
Patent
active
049396005
ABSTRACT:
The power amplifier for the head positioning coil of a Winchester or hard disk drive digital storage system includes circuitry for generating complementary variable width pulses at a frequency above 100 kilohertz. The filter coupling the positive and negative power pulses to the head positioner coil includes two oppositely poled coils mounted on a single enclosing coil to avoid D.C. saturation and to maintain high inductance for high frequency noise filtering. Circuitry is also provided for improving the common mode noise rejection capability of the feedback circuit, and the head retract circuitry.
REFERENCES:
patent: 1813036 (1931-07-01), Elliott
patent: 2088454 (1937-07-01), Whisk
patent: 2802186 (1957-08-01), Dewitz
patent: 4359674 (1982-11-01), Goton
patent: 4473811 (1984-09-01), Schauble
patent: 4728918 (1988-03-01), Neusser et al.
Modern Dictionary of Electronics, First Edition, 1/1962, Howard W. Sams & Co., Entry for "hum-bucking coil".
Unitrode Corp.,/Linear Integrated Circuits; Switched Mode Mode Controller for DC Motor Drive, Specification Sheet, UC1637/UC2637/UC 3637, Aug. 1985.
Unitrode Corp., Switched Mode Controller for DC Motor Drive, UC 1637/UC2637/UC 3637, Application Note, U-102, p. 301-311.
Desai Ashok K.
Gami Bipin V.
Jacobs Russell H.
Micropolis Corporation
Robertson David L.
Stephan Steven L.
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