Magneto-optical eraser

Details Magneto-optical eraser Magneto-optical eraser

1992-02-20

1993-07-27

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 365122, G11B 1110, G11B 1304

Patent

active

052316149

ABSTRACT:
In a magneto-optical eraser, information recorded on a magnetic layer of a magneto-optical recording medium is erased or initialized by applying light over the magneto-optical recording medium from a light source (13,43) in a reflector to heat the magneto-optical recording medium and also by supplying a magnetic field to the magneto-optical recording medium along its axis of easy magnetization. In one form, a plurality of light sources (13) may be disposed in the surface of a single reflector (12). Alternatively, the magneto-optical recording medium may be double-faced, and a light source and reflector may be disposed on each side of the double-face recording medium. A pre-heater (52) may increase the temperature within a glass housing (50,51) to a temperature less than the softening point of the medium substrate.

REFERENCES:
patent: 3176278 (1965-03-01), Mayer
patent: 3631415 (1971-12-01), Aagard et al.
patent: 4686661 (1987-08-01), Isaka
patent: 4788671 (1988-11-01), Kanda
patent: 4926403 (1990-05-01), Tsuyuguchi et al.

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