Optical apparatus for tracking a record carrier

Details Optical apparatus for tracking a record carrier Optical apparatus for tracking a record carrier

1980-06-04

1982-08-24

Wolff, John H.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369102, 360 77, 250202, 3581285, G11B 700, H04N 576

Patent

active

043464718

ABSTRACT:
An apparatus for tracking, by means of radiating beams of light, a record disc (6) which contains video or audio signals recorded in optical form. First and second lasers (1a, 1b) generate a first beam for reading out recorded information, and a second beam for tracking, respectively. The first beam provides a first optical spot (8a) on an information track (7) and the second beam provides a second optical spot (8b) in close proximity to the first spot. The first and second beams are selected alternately. The reflected second beam is detected by a radiation-sensitive detector (20) and compared with a reference signal level. The position of the optical system (200), including the first and second lasers, is physically adjusted by shifting means (14) in response to amplitude differences between the detected signal caused by the second beam and the reference signal level to implement accurate tracking control in spite of spindle hole eccentricities or the like.

REFERENCES:
patent: 4051528 (1977-09-01), Takeda

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