Magnetic field generating device

Details Magnetic field generating device Magnetic field generating device

1992-06-08

1994-03-08

Pascal, Robert J.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, G11B 1304

Patent

active

052933601

ABSTRACT:
There is disclosed a magnetic field generating device for use in a magnetooptical recording apparatus of a magnetic field modulation method. The device includes a planar spiral coil, of which coil pitch is smaller in the peripheral area than that in the central area thereof, thus realizing a relatively wide area of magnetic field of uniform intensity, with a low inductance. Because of the planar structure, the device can be positioned very close to the recording medium, and can achieve the high speed switching required in the magnetic field modulation method, without a large power source.

REFERENCES:
patent: 3648264 (1972-03-01), Gruczelak et al.
patent: 4295173 (1981-10-01), Romankiw et al.
patent: 4414554 (1983-11-01), Springer
patent: 4719527 (1988-01-01), Yoshisato
patent: 4862437 (1989-08-01), Okada
patent: 4993009 (1991-02-01), Shilo

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