Apparatus for selectively inverting a magnetic biased field for

Details Apparatus for selectively inverting a magnetic biased field for Apparatus for selectively inverting a magnetic biased field for

1995-03-13

1996-08-06

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

055441327

ABSTRACT:
An apparatus for selectively inverting an external magnetic field in a magneto-optic recording system so that information can be selectively recorded on or erased from a magneto-optic recording element of the system moving through said field, the apparatus comprises a permanent magnet having its north and south poles oriented along its cross-sectional dimension. A core having a shape which is adaptable to selectively impart a predetermined magnetic field to the permanent magnet for rotating the permanent magnet, which directs a flux generated by the predetermined magnetic field for reducing electro-magnetic interference, and which defines a preferential orientation of the magnet for selectively maintaining the magnet in the preferential orientation.

REFERENCES:
patent: 4962492 (1990-10-01), Mathildus
patent: 5020042 (1991-05-01), Fearnside et al.
patent: 5291345 (1994-03-01), Umeda et al.
patent: 5317548 (1994-05-01), Matsuda et al.
patent: 5351221 (1994-09-01), Ohno

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