Magneto-optical recorder with compensation for variation in appl

Details Magneto-optical recorder with compensation for variation in appl Magneto-optical recorder with compensation for variation in appl

1988-01-19

1991-01-01

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, 369116, G11B 1304

Patent

active

049823892

ABSTRACT:
A magneto-optical recorder comprising an optical head for projecting a light beam on a magneto-optical recording medium so as to form a light spot thereon, a magnetic head disposed at a predetermined distance from the optical head and applying a magnetic field modulated according to information to be recorded to the magneto-optical recording medium; and light intensity controlling means for varying the intensity of the light spot, responding to at least one of a focusing error signal indicating deviations of the light spot from the magneto-optical recording medium and a position signal indicating the relative position of the magneto-optical recording medium and the optical head, wherein, even if the intensity of the magnetic field applied to the recording medium varies, depending on vertical oscillations of the recording medium or on the position of the light spot, influences of variations in the intensity of the applied magnetic field are compensated by varying the intensity of the light spot so that fluctuations in the amount of recorded signals and imperfect erasing are suppressed.

REFERENCES:
patent: 4426693 (1984-01-01), Satoh et al.
patent: 4472748 (1984-09-01), Kato et al.
patent: 4495530 (1985-01-01), Yanagida
patent: 4710908 (1987-12-01), Ohshima et al.
patent: 4736353 (1988-04-01), Kasai et al.
patent: 4745587 (1988-05-01), Maeda et al.

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