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

1981-12-31

1984-09-18

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Thermomagnetic recording or transducers

360114, G11B 502

Patent

active

044727488

ABSTRACT:
In a method of recording an information signal in an opto-magnetic record disc which has an easily magnetizable axis perpendicular to its surface, a constant erasing light beam and a modulated recording light beam are focussed by a single objective lens on adjacent tracks and an external magnetic field is applied to the record medium. The erasing and recording operations can be carried out at the same time by inverting the polarity of the external magnetic field track by track.

REFERENCES:
patent: 3778791 (1973-12-01), Lewicki et al.
patent: 3876842 (1975-04-01), Bouwhuis
patent: 4340914 (1982-07-01), Hanaoka

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