Magnetically coupled apparatus for inverting a bias field for ma

Details Magnetically coupled apparatus for inverting a bias field for ma Magnetically coupled apparatus for inverting a bias field for ma

1998-03-26

1999-06-01

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, 360 59, G11B 1304

Patent

active

059094117

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 comprises 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 the magnet to rotate; and (c) a ferromagnetic element enclosing a portion of said magnet and having a plurality of spatially separated pole teeth, each of said pole teeth having an operably connected coil disposed thereon that releases said magnet for rotation caused by the conductive substrate when the coil is energized, and prevents rotation when said coil is de-energized for permitting said magnet to be selectively rotated.

REFERENCES:
patent: 5072432 (1991-12-01), Tanaka
patent: 5570329 (1996-10-01), Furlani
patent: 5768220 (1998-06-01), Williams et al.

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