Focusing and tracking error control system for an optical record

Details Focusing and tracking error control system for an optical record Focusing and tracking error control system for an optical record

1988-02-24

1989-09-12

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

365 45, 250201, G11B 700

Patent

active

048666890

ABSTRACT:
A control system for an optical recording-reproducing device divides and detects reflected light from an optical disk by a plurality of photo-detecting elements. The detection outputs are divided by a detection output corresponding to the total quantity of reflected light for the purpose of obtaining control signals for correcting tracking error and focus error. The control system for the optical recording-reproducing device is constituted by a device for logarithmically compressing detection currents from the photo-detecting elements and a device for logarithmically compressing a detection current corresponding to the total quantity of reflected light. A subtraction is performed between the detected outputs, which have been compressed logarithmically, and the detected output corresponding to the total quantity of light, which has also been compressed logarithmically, for the purpose of executing a division between the detected outputs and the detected output corresponding to the total quantity of reflected light. As a result, a wide dynamic range can be realized, and the magnitude of any error can be correctly obtained, regardless of the total quantity of reflected light, so that a siimple, monolithic circuit can be realized.

REFERENCES:
patent: 4617654 (1986-10-01), Gross et al.
patent: 4651314 (1987-03-01), Yoshikawa et al.
patent: 4774401 (1988-09-01), Yamada et al.

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