Tracking controller and seek controller for optical recording de

Details Tracking controller and seek controller for optical recording de Tracking controller and seek controller for optical recording de

1996-06-05

1998-04-21

Dinh, Tan

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4436, 369 4432, G11B 1722

Patent

active

057425680

ABSTRACT:
A control circuit for use in an optical disk apparatus, which includes a carriage provided with a focus moving mechanism for supporting an objective lens; a carriage driving circuit for driving the carriage; and a tracking error detecting circuit for detecting a tracking error signal which represents a displacement of the light beam form the center of the information track. In the control circuit, a tracking control loop for performing a tracking control by feeding back a dc-component and ac-components, with frequencies which are not more than 10 kHz, of the tracking error signal to the carriage driving circuit is formed. Further, a filter device for attenuating the gain of the tracking control loop correspondingly to a frequency in the vicinity of a resonance frequency in a direction, in which the focus moving mechanism or the carriage crosses the information track, is provided in the tracking control loop. Moreover, the open-loop or overall gain crossover frequency of the tracking control loop is not less than 2 kHz.

REFERENCES:
patent: 5033037 (1991-07-01), Yanagi
patent: 5182736 (1993-01-01), Yanagi
patent: 5241522 (1993-08-01), Yanagi
patent: 5457671 (1995-10-01), Takata et al.
patent: 5499230 (1996-03-01), Yanagi
patent: 5566152 (1996-10-01), Takamine et al.

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