Capacitance detection control circuit for positioning a magnetic

Details Capacitance detection control circuit for positioning a magnetic Capacitance detection control circuit for positioning a magnetic

1990-08-21

1992-03-10

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 66, 360114, 360 59, G11B 1304, G11B 1110, G11B 1112

Patent

active

050954709

ABSTRACT:
A magnetic head position control apparatus for driving the magnetic head of a disk recording apparatus toward or away from the recording surface of a magneto-optical disk to effect position control of the magnetic head. Changes in the distance between the magnetic head and the magneto-optical disk are detected from changes in capacitance between a capacitance detection electrode mounted on the magnetic head and a surface of the magneto-optical disk. An oscillator circuit connected to the capacitance detection electrode varies its oscillation frequency in response to changes in capacitance and detects such frequency variations and controls the position of the magnetic head for maintaining it at a constant predetermined distance from the magneto-optical disk.

REFERENCES:
patent: 2982822 (1961-05-01), Bacon
patent: 4630251 (1986-12-01), Tomita et al.
patent: 4823205 (1989-04-01), Hannon et al.
patent: 4937801 (1990-06-01), Miura et al.
patent: 4998231 (1991-03-01), Watanabe et al.
Patent Abstract of Japan, vol. 12, No. 314, Aug. 25, 1988, JP-A-63-79385, NEC, "Temperature Compensation of Piezoelectric Actuator", Research Disclosure, p. 242, Jun. 1981.

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