Device for controlling rotation of a magnet used in a magneto-op

Details Device for controlling rotation of a magnet used in a magneto-op Device for controlling rotation of a magnet used in a magneto-op

1987-12-11

1990-11-20

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, G11B 1110, G11B 1304

Patent

active

049723375

ABSTRACT:
A rotation control for a magnet used in a magneto-optical recording system having a first coil that rotates a permanent magnet to invert the polarity of its magnetic field applied to an optical recording type disc and a second coil provided at the position displaced from the central line of the first coil and for applying a driving force to the permanent magnet when the permanent magnet begins to rotate, wherein the permanent magnet can be settled in quite a short time after it is inverted in polarity by controlling a drive current applied to the second coil.

REFERENCES:
patent: 4629982 (1986-12-01), Kieslich
patent: 4748606 (1988-05-01), Naito et al.
patent: 4769803 (1988-09-01), Yamamiya

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