Optically reproducing and tracking system for spiral information

Details Optically reproducing and tracking system for spiral information Optically reproducing and tracking system for spiral information

1979-12-11

1981-12-08

Konick, Bernard

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369275, G11B 2110, G11B 700

Patent

active

043051448

ABSTRACT:
A tracking mirror reflects monochromatic divergent light toward a rotating record disc provided with an engraved spiral track. The reflected light is focussed, as an optical spot, on the track by a collecting lens. Light reflected from and diffracted by the track is focussed onto an optical detector in a diffraction pattern including a principal maximum and bilaterial secondary maxima. The optical detector detects the principal maximum to form a reproduced signal and differentially detects the secondary maxima to produce a tracking signal. The mirror along with the lens and optical detector unit is moved in response to the tracking signal to cause the optical spot to follow the track.

REFERENCES:
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patent: 3913076 (1975-10-01), Lehureau et al.
patent: 3919465 (1975-11-01), Adler et al.
patent: 3931459 (1976-01-01), Korpel
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patent: 4051527 (1977-09-01), Braat
patent: 4051529 (1977-04-01), Miyaoka
patent: 4057833 (1977-11-01), Braat
patent: 4058834 (1977-11-01), Miyaoka
patent: 4059841 (1977-11-01), Bricot et al.
patent: 4065786 (1977-12-01), Stewart

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