Self-compensating focus system for a reflective video disc

Details Self-compensating focus system for a reflective video disc Self-compensating focus system for a reflective video disc

1975-01-29

1976-01-13

Cardillo, Jr., Raymond F.

Telegraphy

Systems

Simplex-reversing periodic

178 67A, 1791003V, H04N 576

Patent

active

039327019

ABSTRACT:
An optical video playback device has an optical system for reading discs with a laser and further has a self-compensating focusing feature. This avoids the need for focus servos and the like to maintain proper conditions of focus.

REFERENCES:
patent: 2972660 (1961-02-01), Toulon
patent: 3673412 (1972-06-01), Olson
patent: 3743395 (1973-07-01), Preuss
patent: 3833769 (1974-09-01), Compaan et al.
patent: 3848095 (1974-11-01), Wohlmut et al.
patent: 3873763 (1975-03-01), Janssen
patent: 3876841 (1975-04-01), Kramer et al.
patent: 3876842 (1975-04-01), Bouwhuis
Rice et al., An Experimental Television Recording And Playback System Using Photographic Discs, Jour. of the S.M.P.T.E. Vol. 79, No. 11, 11/70, pp. 997-1002.

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