Focusing system for videodisc player

Details Focusing system for videodisc player Focusing system for videodisc player

1974-03-25

1976-12-14

Cardillo, Jr., Raymond F.

Telegraphy

Systems

Simplex-reversing periodic

1791003V, 250201, H04N 576

Patent

active

039977153

ABSTRACT:
A focus detector includes apertured photodetectors which intercept a radiant beam. Changes in focus differentially affect the amount of radiation impinging on the detectors resulting in corresponding changes in their signal output.

REFERENCES:
patent: 3532045 (1970-10-01), Genahr
patent: 3596101 (1971-07-01), Someya
patent: 3673412 (1972-06-01), Olson
patent: 3757124 (1973-09-01), Kaestner
patent: 3833769 (1974-09-01), Compaan et al.
patent: 3876841 (1975-04-01), Krammer et al.
IBM Technical Disc. Bulletin, Frosch et al., vol. 15, No. 2, 7/72, pp. 504-505.

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