System for selectively inverting a magnetic bias field for magne

Details System for selectively inverting a magnetic bias field for magne System for selectively inverting a magnetic bias field for magne

1995-03-31

1996-10-29

Nelms, David C.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 14, 369110, 360114, G11B 1304

Patent

active

055703291

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 the field, the apparatus comprises a first and second magnet operatively connected to each other both having a north and south pole oriented along their cross-sectional dimension, and each magnet having a pole, which is of opposite polarity from the other magnet, positioned adjacent the recording element. A device, in operative association with the magnets, alternately rotates the magnets between a first and second position so that the first position is in close proximity with the recording element, which permits either the first or second magnet to induce the magnetic field through which the recording element moves, and the second position that is in a spaced apart relationship with the first position, which substantially prevents the magnetic of either the first or second magnet from engaging the recording element.

REFERENCES:
patent: 4972337 (1990-11-01), Eguchi et al.
patent: 4984224 (1991-01-01), Tsuyugauchi et al.
patent: 5020042 (1991-05-01), Fearnside et al.
patent: 5043959 (1991-08-01), Minami et al.
patent: 5229983 (1993-07-01), Kawamura et al.
patent: 5291345 (1994-03-01), Umeda et al.

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