Dual coil, translational bias-field device for a magneto-optical

Details Dual coil, translational bias-field device for a magneto-optical Dual coil, translational bias-field device for a magneto-optical

1996-12-12

1998-01-20

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

057107475

ABSTRACT:
A translational, bias-field device for a magneto-optical system having a magneto-optical recording element moving through a first 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 housing and a first rail for enabling translational movement attached to said housing. A permanent magnet structure is polarized through its cross-section having a first set of north and south poles on a first surface positioned adjacent the magneto-optic recording element for providing the first magnetic field to the recording element, and a second set of north and south poles on a second surface, and the permanent magnet structure attached to the first rail which enables translational movement of the magnet structure. A first coil is positioned adjacent to the magnet which, when energized, imparts a second magnetic field to the permanent magnet structure for imparting motion to the permanent magnet structure, and a second coil is positioned adjacent to the magnet which, when energized, imparts a third magnetic field to the permanent magnet structure for also imparting motion to the permanent magnet structure.

REFERENCES:
patent: 4972337 (1990-11-01), Eguchi et al.
patent: 4984226 (1991-01-01), Kobori
patent: 5020042 (1991-05-01), Fearnside et al.
patent: 5291345 (1994-03-01), Umeda et al.
patent: 5490124 (1996-02-01), Oliver et al.
patent: 5535181 (1996-07-01), Furlani et al.
patent: 5619479 (1997-04-01), Furlani et al.

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