Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1994-06-21
1996-12-17
Neyzari, Ali
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360 59, 360114, G11B 1100, G11B 502
Patent
active
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:
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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.
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Hiramatsu Makoto
Ishii Kazuyoshi
Canon Kabushiki Kaisha
Neyzari Ali
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