Apparatus for developing a magnetic field which maintains a neut

Details Apparatus for developing a magnetic field which maintains a neut Apparatus for developing a magnetic field which maintains a neut

1988-05-06

1991-08-27

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, 360 66, G11B 1304, G11B 503

Patent

active

050439596

ABSTRACT:
An apparatus for operating a magneto-optic medium includes a magnetic biasing field developing device for developing a magnetic biasing field which is applied to the magneto-optic medium when the magneto-optic medium erases or records data. Additionally, a neutral-position controller is provided for positioning permanent magnets of the magnetic biasing field developing device in a neutral position with respect to the medium when the magnetic biasing field developing device is switched off. Thereby, the neutral-position controller maintains the medium at the neutral position with respect to the permanent magnets until the magnetic biasing developing device is switched on and the permanent magnets are placed in a field applying position.

REFERENCES:
patent: 4748606 (1988-05-01), Naito et al.
patent: 4789972 (1988-12-01), Oldham
Japanese Patent Abstract, vol. 8, No. 282 (P-323) [1719], Dec. 22, 1984 (JP/59-146408).

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