Method and apparatus for producing write and erase magnetic fiel

Details Method and apparatus for producing write and erase magnetic fiel Method and apparatus for producing write and erase magnetic fiel

1991-07-12

1993-06-08

Nguyen, Hoa T.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Thermomagnetic recording or transducers

369 13, 360114, G11B 1304, G11B 1112, G11B 1110

Patent

active

052184889

ABSTRACT:
A magneto-optic disk drive includes a magneto-optic disk and a rotary arm for positioning a focus/bias field switching assembly adjacent bit positions on the disk. A bias field switching assembly includes an annular permanent magnet mounted within a guide for movement between write and erase positions and an objective lens. The magnet has central and pole surfaces generally parallel to the disk. Coils on the guide are energized to drive the magnet between the write and erase positions. In its erase position the magnet impinges a first polarity erase magnetic field on the disk. In its write position the magnet impinges a second polarity write magnetic field upon the disk. The magnet is releasably latched in both its write and erase positions by ferro-magnetic elements mounted to the guide.

REFERENCES:
patent: 4977549 (1990-12-01), Berg

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