Video disc player with movable mirror for directing light beam o

Details Video disc player with movable mirror for directing light beam o Video disc player with movable mirror for directing light beam o

1974-05-01

1976-03-16

Cook, Daryl W.

Telegraphy

Systems

Simplex-reversing periodic

178 67A, 1791003V, G11B 2110, G11B 708, H04N 576

Patent

active

039447278

ABSTRACT:
A video signal play back device derives video signals from a track on a video disc using a light source and an optical path to a lens system which is supported by an air bearing at a predetermined spacing from the surface of the disc. 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 single photosensitive pick-up which, provides input signals to a circuit which generates a "fine" servo control signal to drive the articulated mirror. The air bearing member includes apparatus providing a bias force that varies with the radial displacement of the transducer assembly relative to the disc center.

REFERENCES:
patent: 3381085 (1968-04-01), Johnson
patent: 3381086 (1968-04-01), De Moss
patent: 3530258 (1970-09-01), Gregg
patent: 3612642 (1971-10-01), Dostal
patent: 3715524 (1973-02-01), Adler
patent: 3798386 (1974-03-01), Dickopp

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