Access control circuit for use in optical disk unit

Details Access control circuit for use in optical disk unit Access control circuit for use in optical disk unit

1993-08-25

1995-06-06

Epps, Georgia Y.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4429, G11B 7085

Patent

active

054228670

ABSTRACT:
An access control circuit for use in an optical disk unit including a linear drive mechanism for linearly sliding an optical head to thereby shift a beam spot to a target track on an optical disk. The slider of the linear drive mechanism and the optical head are integrally structured. The sliding speed of the linear drive mechanism is detected by a speed detection unit and the target speed of the linear drive mechanism is calculated by a target speed calculation unit. The difference between the sliding speed and the target speed is detected by a speed difference detection unit and thereby a speed difference signal is obtained. Then, the speed difference signal and a high-frequency signal from an oscillation unit are added together and the sum signal is output to a current supply unit, and thereby a drive current in accordance with the sum signal is supplied from the current supply unit to the linear drive mechanism to drive the same.

REFERENCES:
patent: 4931889 (1990-06-01), Osafune
patent: 5146440 (1992-09-01), Yamaguchi et al.
patent: 5182736 (1993-01-01), Yanagi
patent: 5191566 (1993-03-01), Yamaguchi et al.
patent: 5216647 (1993-06-01), Kitani
patent: 5301174 (1994-04-01), Matoba et al.

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