Apparatus for generating magnetic field in a magneto-optic recor

Details Apparatus for generating magnetic field in a magneto-optic recor Apparatus for generating magnetic field in a magneto-optic recor

1986-09-26

1988-06-07

Cardillo, Raymond F.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360114, 365122, G11B 1112, G11B 1304

Patent

active

047501596

ABSTRACT:
In an apparatus for generating a magnetic field, first and second electromagnetic coils are linearly arranged on a yoke. The coils face one surface of an optical disk. An optical head is positioned above the other surface of the optical disk. A track address for denoting a track on the optical disk is picked up from the optical disk by the optical head and an information signal processor. A first and/or second energizing signal is generated from a switching circuit in accordance with the track address. Thus, one or both of coil drive circuits are driven in response to the energizing signals, energizing one or both of the coils, so that a predetermined magnetic field is applied to the optical disk from the selected coil or coils.

REFERENCES:
patent: 4539662 (1985-09-01), Hatano et al.
patent: 4610009 (1986-09-01), Connell

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