Magnetooptical recording apparatus including a control circuit f

Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam

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360 59, 360114, G11B 1100, G11B 502

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055860915

ABSTRACT:
In a magnetooptical recording apparatus, a light beam is radiated onto a magnetooptical recording medium while applying a bias magnetic field to the recording medium in such a manner that at least one of the light beam and the bias magnetic field is modulated according to an information signal. A current to be supplied from a DC power supply to the bias magnetic field applying device is switched by a switch element. The current switched by the switch element is smoothed by a smoothing circuit. The current to be supplied from the DC power supply to the bias magnetic field device is detected by a current detection element. A ratio between ON and OFF time periods of the switch element is changed in correspondence with an error between a value detected by the current detection element and a pre-set reference value.

REFERENCES:
patent: 5220467 (1993-06-01), Zucker
patent: 5377055 (1994-12-01), Ishii
Smedley, et al., "One-Cycle Control of Switching Converters," Power Electronics Group, Jun. 1991, pp. 888 through 896.
Patent Abstracts of Japan, Kokai No. 3-238602, vol. 16, No. 24, Jan. 1992.
Patent Abstracts of Japan, Kokai No. 3-198204, vol. 15, No. 466, Nov. 1991.
Patent Abstracts of Japan, Kokai No. 3-157839, vol. 15, No. 395, Oct. 1991.
Patent Abstracts of Japan, Kokai No. 3-130903, vol. 15, No. 347, Sep. 1991.

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