Magnetic head position control apparatus including drive means r

Details Magnetic head position control apparatus including drive means r Magnetic head position control apparatus including drive means r

1991-10-07

1992-12-01

Nguyen, Hoa

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360114, 360 66, G11B 1304, G11B 1110, G11B 1112, G11B 558

Patent

active

051684837

ABSTRACT:
A magnetic head position control apparatus for driving the magnetic head of a disc recording apparatus toward or away from the recording surface of a magneto-optical disc to effect position control of the magnetic head detects changes in the distance between the magnetic head and the magneto-optical disc by detecting changes in the capacitance between a capacitance detection electrode mounted on the magnetic head and a surface of the magnetic disc and generates a voltage to control the position of the magnetic head for maintaining it at a constant predetermined distance from the magneto-optical disc. Stray capacitance between the disc and the disc recording apparatus is based on the size of the disc, which is either detected directly or obtained from pre-recorded data on the disc, and is compensated by adding a bias voltage to the voltage generated using the capacitance detection electrode to provide further control of the position of the magnetic head.

REFERENCES:
patent: 2982822 (1961-05-01), Bacon
patent: 4706232 (1987-11-01), Funada et al.
patent: 4931887 (1990-06-01), Hegde et al.
patent: 4937801 (1990-06-01), Miura et al.
patent: 4998231 (1991-03-01), Watanabe et al.

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