Apparatus for selectively inverting a magnetic bias field using

Details Apparatus for selectively inverting a magnetic bias field using Apparatus for selectively inverting a magnetic bias field using

1989-09-25

1991-05-28

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, 360 59, G11B 1304, G11B 1112

Patent

active

050200429

ABSTRACT:
Apparatus for selectively reversing a magnetic bias field (e.g., to switch between recording and erasing modes in a magnetooptic recording system) includes a rod-shaped permanent magnet having its magnetic poles oriented along the cross-sectional dimension thereof. The rod is mounted for axial rotation within a concentrically arranged tube of electrically conductive material, and means are provided for biasing the rotational position of the magnet toward either of two nominal positions, 1/2.degree. apart. Upon being subjected to a torque, the magnet rotates toward either of its nominal positions, and oscillatory movement about such nominal positions is damped by eddy-current-produced magnetic forces in the conductive tube.

REFERENCES:
patent: 4701895 (1987-10-01), VanSaint

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