Focus detecting device

Details Focus detecting device Focus detecting device

1979-04-25

1981-03-31

Hix, L. T.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

354 1, 354198, 250204, G03B 1318, G03B 1720

Patent

active

042589894

ABSTRACT:
A focus detecting device having a release lens for reforming the image of an object which is formed between a lens and the focal plane of the lens. A mirror is provided between the release lens and an image reforming plane for dividing the primary image into two secondary images. Two light receiving element arrays provided in the image forming planes of said secondary images provide outputs to a signal processing circuit for comparison to produce a signal indicating whether or not the lens is focussed on the object. The mirror for dividing the primary image into two secondary images, shifts the two secondary images in opposite directions on the light receiving element arrays at the time of defocussing so that the difference between the outputs of said two light receiving element arrays is not zero. At the time of focussing, the two secondary images are located at equivalent positions on the light receiving element arrays so that the difference between the outputs of said two light receiving element arrays is zero.

REFERENCES:
patent: 4047022 (1977-09-01), Holle
patent: 4132838 (1979-01-01), Kondo
patent: 4180309 (1979-12-01), Migata

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