Control devices for optical disk based on driving signal saturat

Details Control devices for optical disk based on driving signal saturat Control devices for optical disk based on driving signal saturat

1996-01-22

1997-12-16

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 369 4435, G11B 7095

Patent

active

056993340

ABSTRACT:
A tracking control device for controlling a position of a beam spot formed by converging a light beam on a disk having tracks formed thereon includes: an actuator for moving the beam spot in a direction substantially perpendicular to the tracks; a tracking error detecting circuit for detecting a deviation of the beam spot from one of the tracks using the light beam returning from the disk and for outputting a tracking error signal indicative of the detected deviation; and a control circuit section for outputting a driving signal to drive the actuator in accordance with the tracking error signal so as to control the beam spot to be positioned on the one of the tracks. When the driving signal is saturated, the control circuit section obtains a saturation signal in accordance with an amount of the saturation, delays the saturation signal, and supplies the saturation signal to the actuator together with the driving signal.

REFERENCES:
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patent: 4872152 (1989-10-01), Tsuyoshi et al.
patent: 5083150 (1992-01-01), Nagasaki et al.
patent: 5084848 (1992-01-01), Deguchi et al.
patent: 5138596 (1992-08-01), Yamada
patent: 5247502 (1993-09-01), Sato
patent: 5461599 (1995-10-01), Iida
patent: 5487055 (1996-01-01), Suzuki

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