Camera focus detecting device

Details Camera focus detecting device Camera focus detecting device

1979-06-04

1981-10-06

Hix, L. T.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

354 25, 354 31, 250204, G03B 1318, G01J 136

Patent

active

042932050

ABSTRACT:
A focus detecting device for a lens system having a subsystem for dividing the image of an object into two optically equal images and for shifting the two images of the object in the opposite directions or shifting only one of the two images of the object. Two photoelectric conversion element groups are adapted to convert the variations in relative position of the two images of the object into electrical signals. An optical system projects the images of the object onto the two photoelectric conversion element groups, in which the following outputs are obtained from the outputs of photoelectric conversion elements forming the two photoelectric conversion element groups by using a calculating circuit: ##EQU1## where: n is the number of photoelectric conversion elements forming each photoelectric conversion element group, m is the number in order of a photoelectric conversion element and, i.sub.1 through i.sub.n and i'.sub.1 through i'.sub.n are the outputs of photoelectric conversion elements which are proportional to the quantities of light applied thereto, respectively.

REFERENCES:
patent: 3860935 (1975-01-01), Stauffer
patent: 3945023 (1976-03-01), Stauffer
patent: 4180309 (1979-12-01), Miyata et al.
patent: 4203031 (1980-05-01), Kamachi et al.

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