Automatic focusing position detection apparatus

Details Automatic focusing position detection apparatus Automatic focusing position detection apparatus

1980-10-28

1983-06-14

Perkey, William B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250201, G03B 300, G01J 144

Patent

active

043879756

ABSTRACT:
An automatic focusing position detection apparatus of a double image overlapping type having a plurality of photoelectric element groups capable of detecting rays of light from an object separately, which can detect the focusing position from the output signals from the photoelectric element groups, and which includes a shifting circuit capable of shifting the output signals from one photoelectric element group relative to the output signals of other photoelectric group, and a circuit for calculating the defocusing distance by obtaining the correlation degree of the output signals of the photoelectric element groups which are shifted relatively to each other by the shifting circuit, and by obtaining the shift distance by the shifting circuit.

REFERENCES:
patent: 4080531 (1978-03-01), Stauffer
patent: 4157217 (1979-06-01), Isono
patent: 4182563 (1980-01-01), Bizer et al.
patent: 4189232 (1980-02-01), Asano et al.
patent: 4218119 (1980-08-01), Schickedanz
patent: 4240726 (1980-12-01), Wick
patent: 4257705 (1981-03-01), Hosoe et al.

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