Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1991-09-16
1992-09-15
Nguyen, Hoa
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360114, 360 59, 360103, G11B 1304, G11B 1110, G11B 1112
Patent
active
051484153
ABSTRACT:
A magneto-optical disc apparatus comprising a distance sensor detecting the distance optically between a magneto-optical disc and a magnetic head, a circuit sample-holding the detected output of the distance sensor, and a controlling mechanism controlling the distance between the magneto-optical disc and the magnetic head in the case where the detected output of the distance sensor is changed suddenly, responsive to a sample-held detected output immediately before the sudden change. Even when the detected output of the distance sensor changes suddenly by receiving a reflected light from a sector mark of the magneto-optical disc, the distance between the magneto-optical disc and the magnetic head does not change suddenly according to the sudden change, since the distance between the both is controlled responsive to the detected output having been sample-held immediately before the sudden change.
REFERENCES:
patent: 4706232 (1987-11-01), Funada et al.
patent: 5091897 (1992-02-01), Otokawa et al.
patent: 5095470 (1992-03-01), Oka et al.
Mitsubishi Denki & Kabushiki Kaisha
Nguyen Hoa
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