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Primary Examiner: Cardillo, Jr., Raymond F.
Assistant Examiner:
Attorney: O'Connor; Cornelius J.

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Title: Self-compensating focus system for a reflective video disc

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.


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Inventors: Adler, Robert (Northfield, IL, US)

Application Number: 545072
Filing Date: 1975-01-29
Publication_date: 1976-01-13
Assignee: Zenith Radio Corporation (Chicago, IL)
Primary Class(es): 369/112.24 369/111
Other Classes:
US Patent Ref:
2972660Feb, 1961Toulon178/6.
3673412Jun, 1972Olson250/201.
3743395Jul, 1973Preuss352/22.
3833769Sep, 1974Compaan et al.179/100.
3848095Nov, 1974Wohlmut et al.179/100.
3873763Mar, 1975Janssen178/6.
3876841Apr, 1975Kramer et al.179/100.
3876842Apr, 1975Bouwhuis178/6.

Other Refs: Other References: 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.