Magnet turn-over mechanism for recording and/or erasing an infor

Details Magnet turn-over mechanism for recording and/or erasing an infor Magnet turn-over mechanism for recording and/or erasing an infor

1989-11-14

1991-12-10

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360114, G11B 503, G11B 1304

Patent

active

050724320

ABSTRACT:
A magnet turn-over mechanism for turning a permanent magnet used for applying first and second predetermined magnetic fields selectively to a magneto-optical disk for recording and/or erasing an information on and from the magneto-optical disk comprises support mechanism for supporting the permanent magnet rotatably in a vicinity of the magneto-optical disk such that a first magnetic pole and a second magnetic pole are selectively directed to the magneto-optical disk, driving device for turning the permanent magnet supported by the support mechanism, optical modulation device moved together with the turning of the permanent magnet for producing a modulated optical output indicative of an angular position of the permanent magnet caused by the turning of the permanent magnet by modulating an optical radiation supplied thereto, and optical angular position detection device supplied with the modulated optical output from the optical modulation device for detecting the angular position of the permanent magnet.

REFERENCES:
patent: 4516177 (1985-05-01), Moon et al.
patent: 4701895 (1987-10-01), Van Sant
patent: 4742213 (1988-05-01), Conant
patent: 4748606 (1988-05-01), Naito et al.
patent: 4969056 (1990-11-01), Negishi et al.
patent: 4979158 (1990-12-01), Yoda
Introduction to Robotics-Arthur J. Critchlow-pp. 125-127, Macmillan Publishing Company, Copyright 1985.

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