Method of processing information signal with respect to opto-mag

Details Method of processing information signal with respect to opto-mag Method of processing information signal with respect to opto-mag

1981-11-25

1985-01-22

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Thermomagnetic recording or transducers

G11B 502

Patent

active

044955308

ABSTRACT:
In an opto-magnetic apparatus using an opto-magnetic record disc which has been uniformly magnetized in one direction perpendicular to a surface of the disc, an information signal recorded in the disc along a track is erased by irradiating the track to be erased with a laser light beam to heat the relevant track to a Curie point and by applying an external erasing magnetic field having a direction opposite to that of the uniform magnetization in the disc so as to magnetize the track in the other direction. In case of re-recording an information signal in the thus erased track, the information signal is first inverted and then the laser beam is modulated with the inverted information signal and the modulated laser beam is projected upon the erased track, while an external magnetic field having the same direction as that of the uniform magnetization in the disc is applied. The information signal may be alternatively recorded in the erased track without inverting the information signal together with an identifying signal denoting that the recorded information signal has a magnetization of the same direction as that of the uniform magnetizaton.

REFERENCES:
patent: 3631415 (1971-12-01), Asgard

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