Scanning servo system for optical-disc information reproducing a

Details Scanning servo system for optical-disc information reproducing a Scanning servo system for optical-disc information reproducing a

1983-04-29

1986-11-18

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 32, 369 33, 369 45, 369 54, 369 58, 250201, G11B 700, G11B 2110

Patent

active

046239944

ABSTRACT:
A scanning servo system, that is, a focusing servo system or a tracking servo system, for an optical-disc information reproducing apparatus includes (a) a light source for generating a light beam to scan a selected track location on an optical-disc wherein the information is stored as a series of pits arranged in the form of the track; (b) an objective lens for applying a scanning spot of the light beam to the selected track location; (c) a transducer for converting an optical signal or an image of the pit into an electric signal; (d) an actuator for driving the objective lens in response to the electric signal in a direction vertical or radial to the optical-disc, thereby causing the scanning spot to scan the selected track location accurately, the actuator being variable in its response characteristics in response to the electric signal; (e) a circuit for detecting a dropout of the information on the selected track location and generating a responsive signal to the dropout of information; (f) a circuit for delaying the responsive signal to the dropout of information for one rotation period of the optical-disc; and (g) a circuit for lowering the response characteristics of the actuator in response to the responsive signal to the dropout of information through the delaying circuit.

REFERENCES:
patent: 3474418 (1969-10-01), Jensen
patent: 4406000 (1983-09-01), Shoji et al.
patent: 4414655 (1983-11-01), Shoji et al.
patent: 4446545 (1984-05-01), Dijk

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