Method and apparatus for inverting a bias field for magneto-opti

Details Method and apparatus for inverting a bias field for magneto-opti Method and apparatus for inverting a bias field for magneto-opti

1998-03-20

2000-03-28

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, G11B 1100

Patent

active

060440422

ABSTRACT:
A bias-field apparatus for a magneto-optical system having a magneto-optical recording element which includes a conductive substrate and which moves through a magnetic field created by the bias-field device so that information is selectively recorded on or erased from the recording element, the device comprising: a support member; a magnet mounted for rotation in the support member such that when the recording element rotates the conductive substrate creates a magnetic coupling with the magnet for causing said magnet to rotate; and a ferromagnetic element having a coil disposed thereon that releases said magnetic for rotation when the coil is energized, and prevents rotation when said coil is de-energized for permitting said magnet to be selectively rotated.

REFERENCES:
patent: 4972337 (1990-11-01), Eguchi et al.
patent: 5490124 (1996-02-01), Oliver et al.
patent: 5535181 (1996-07-01), Furlani et al.
patent: 5570329 (1996-10-01), Furlani
patent: 5691965 (1997-11-01), Jansen et al.

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