Photomagnetic eraser

Details Photomagnetic eraser Photomagnetic eraser

1992-11-16

1994-06-07

Pascal, Robert J.

Optical: systems and elements

Holographic system or element

Head up display

360114, 360 59, 365122, G11B 1100

Patent

active

053196198

ABSTRACT:
In a photomagnetic eraser, information recorded on a magnetic-layer of a photomagnetic recording medium is erased or initialized by applying light over the photomagnetic recording medium from a light source in a reflector with heating and also by supplying a magnetic field to the photomagnetic recording medium along its axis of easy magnetization. In one form, a plurality of light sources may be disposed in the concave surface of a single reflector. Alternatively, the photomagnetic recording medium may be double-faced, and the light source and reflector may be disposed on each side of the double-face recording medium.

REFERENCES:
patent: 3631415 (1971-12-01), Aagard et al.
patent: 4686661 (1987-08-01), Isaka
patent: 4926403 (1990-05-01), Tsuyuguchi et al.

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