Arrangement for minimizing effects of leakage magnetic fields in

Details Arrangement for minimizing effects of leakage magnetic fields in Arrangement for minimizing effects of leakage magnetic fields in

1988-02-24

1990-07-03

Stephan, Steven L.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 4411, 369 4421, 369 4431, 360114, G11B 1304, G11B 1112

Patent

active

049397117

ABSTRACT:
In an optomagnetic recording/reproducing apparatus, an objective lens is actuated by a lens actuator having focusing and tracking magnetic circuits so that a light beam is focused on an optical disk and is directed to a predetermined area of the optical disk. The lens actuator is mounted on a pickup body which is driven in a radial direction of the disk by a driving magnetic circuit. The optical disk is clamped on a turntable by a magnetic clamp mechanism. First leakage magnetic fields produced from each of the focusing and tracking magnetic circuits, second leakage magnetic fields are produced from the driving magnetic circuit and the magnetic clamp mechanism, and the first and second magnetic fields are directed in mutually opposite directions relative to the optical disk.

REFERENCES:
patent: 4660190 (1987-04-01), Fujii et al.
patent: 4672594 (1987-06-01), Kato et al.

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