Magnetic field applying device

Details Magnetic field applying device Magnetic field applying device

1997-09-26

1999-01-05

Swann, Tod R.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 32, 369 4412, 369112, 369110, G11B 1110

Patent

active

058569570

ABSTRACT:
A compact magnetic field applying device rotates and holds a magnetic field generating member using a small-scale, light-weight vibration actuator. A permanent magnet applies a bias magnetic field on a magnetized information recording area of a magnetooptical disk, and is driven by a vibration actuator. When voltage is applied to a piezoelectric element of the vibration actuator, an annular elastic member generates a travelling wave due to a bending vibration in the perimeter direction of a groove on the elastic member. Because the elastic member and a moving member provided on the permanent magnet are pressed into contact by a coil spring, the permanent magnet rotates. When voltage is not applied to the piezoelectric element, because the elastic member and the moving member are pressed into contact, the permanent magnet is held in a specified rotational position.

REFERENCES:
patent: 4743788 (1988-05-01), Takagi et al.
patent: 5239524 (1993-08-01), Sato et al.
patent: 5600613 (1997-02-01), Matsumoto et al.

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