Video disc head tracking apparatus

Details Video disc head tracking apparatus Video disc head tracking apparatus

1987-06-22

1989-02-28

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

048092479

ABSTRACT:
A video signal play back device derives video signals from successive tracks formed as a continuous spiral on a video disc using a light source and a lens system, which is carried by a rotatable element at a predetermined spacing from the surface of the disc and which defines a folded optical path. The rotatable element translates the lens system in the radial direction relative to the disc for "coarse" steering of the light beam along the information tracks as the disc is rotated by a turntable. The optical path includes a mirror which is articulated for rotational motion about an axis which shifts the point of impingement of the transmitted light beam upon the disc in the radial direction. The returned beam is directed to a photosensitive pick-up which provides input signals to a circuit which generates a "fine" servo control signal to drive the articulated mirror.

REFERENCES:
patent: 3401590 (1968-09-01), Massey
patent: 3534166 (1970-10-01), Korpel
patent: 3715740 (1973-02-01), Schmit
patent: 3829622 (1974-08-01), Elliott
patent: 3944727 (1976-03-01), Elliott

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