Focus detecting device

Details Focus detecting device Focus detecting device

1981-06-29

1983-05-24

Gonzales, John

G03B 300

Patent

active

043847706

ABSTRACT:
A focus detecting device having two concave mirrors for reforming the image of an object which is formed between a lens and the focal plane of lens, and for dividing said image two same secondary images. Two light receiving element arrays are provided in the image forming planes of the secondary images. A signal processing circuit subjects the outputs of the light receiving element arrays to produce a signal indicating whether or not the lens is focussed on the object. By means of the two concave mirrors adapted to form said secondary images, the two secondary images are shifted in the opposite directions on the light receiving element arrays at the time of defocussing so that the difference between the outputs of the two light receiving element arrays is not zero. At the time of proper focus the two secondary images are located at equivalent positions on said light receiving element arrays so that the difference between the outputs of the two light receiving element arrays is zero. A signal processing circuit produces a signal indicating the establishment of the proper focus.

REFERENCES:
patent: 3860935 (1975-01-01), Stauffer
patent: 4080531 (1978-03-01), Stauffer
patent: 4158131 (1979-06-01), Probst
Weber et al., College Physics, McGraw-Hill Book Co., NY, NY, 1959, pp. 475-478.

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