External magnetic field device for a magnetooptical information

Details External magnetic field device for a magnetooptical information External magnetic field device for a magnetooptical information

1992-09-22

1994-08-30

Mis, David

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, G11B 1100, G11B 1110

Patent

active

053434480

ABSTRACT:
An external magnetic field device for a magnetooptical information recording and reproducing apparatus in which an external magnetic field to be applied to a magnetooptical information recording medium is modulated by supplying to a magnetic head an alternate current the polarity of which is changed according to information to be recorded. The device comprises an offset circuit for producing an offset in the alternate current. The direction of the offset is selected so as to increase the current level of the polarity by which the initial magnetization of the information recording medium is reversed. The direction of the offset may be selected so as to cancel the leakage magnetic field.

REFERENCES:
patent: 4672594 (1987-06-01), Kato et al.
patent: 4796241 (1989-01-01), Hayakawa et al.
patent: 4926403 (1990-05-01), Tsuyuguchi et al.
patent: 4937801 (1990-06-01), Miura et al.
Patent Abstracts of Japan, vol. 8, No. 271, (P-320) (Dec. 12, 1984) and corresponding Japanese Patent Publication No. 59-139120.

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