Device for automatically focusing image

Details Device for automatically focusing image Device for automatically focusing image

1977-03-17

1979-01-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250201, 354 25, G01J 136

Patent

active

041328884

ABSTRACT:
Behind an objective which is axially movable, is provided a beam splitter to divide the light path passing through the objective into two light paths. In one of the light paths on the image plane of the objective is located a prism. Behind the prism is provided a photodetector in the optical path includng the prism. In the optical path which does not have the prism also is provided a photodetector at a position which is optically conjugate with the other photodetector. The output of the photodetectors are connected to an output comparing circuit which is connected to a servomotor for controlling the position of the objective. When the outputs of the two photodetectors are equal to each other, the servomotor is stopped.

REFERENCES:
patent: 3054898 (1962-09-01), Westover et al.
patent: 3682071 (1972-08-01), Hosoe
patent: 3844658 (1974-10-01), Gela et al.
patent: 3953729 (1976-04-01), Hosoe et al.
patent: 4047022 (1977-09-01), Holle

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