Method and apparatus for recording information on magnetooptical

Details Method and apparatus for recording information on magnetooptical Method and apparatus for recording information on magnetooptical

1994-10-07

1997-11-11

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, 360 59, G11B 1100

Patent

active

056871414

ABSTRACT:
A magnetooptical recording apparatus effects recording of information on a recording medium using an optical head and a magnetic head while cancelling an external stray magnetic field generated from an actuator, a linear motor or the like. The external stray magnetic field is detected by a detection circuit. A magnetic field for cancelling the detected external stray magnetic field is applied to the recording medium using a magnetic member, a coil wound around the magnetic member and a power source for supplying current to the coil. The external stray magnetic field is detected on the basis of a shift amount, caused by the external stray magnetic field, of a B-H curve representing a relationship between a magnetic field H running through the magnetic member and a magnetic flux B generated in the magnetic member.

REFERENCES:
patent: 4862437 (1989-08-01), Okada
patent: 4959820 (1990-09-01), Horimai et al.

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