Apparatus for detecting focus conditions of an imaging optical s

Details Apparatus for detecting focus conditions of an imaging optical s Apparatus for detecting focus conditions of an imaging optical s

1983-06-14

1986-03-11

Willis, Davis L.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354407, G01J 120

Patent

active

045756260

ABSTRACT:
An apparatus for detecting focus conditions of an imaging optical system is disclosed. The apparatus comprises a light flux dividing means having a plurality of light flux dividing elements arranged at a predetermined focal plane or near a plane conjugated therewith, a photoelectric conversion means having a plurality of light receiving elements arranged to receive light fluxes divided by respective light flux dividing elements in line therewith and means for detecting focus conditions of the imaging optical system based on the outputs of the light receiving elements. The photoelectronic conversion means is so arranged that the cross-section of light fluxes incident upon respective light receiving elements at the exit pupil of the imaging optical system includes regions which are not overlapped with each other.

REFERENCES:
patent: 4185191 (1980-01-01), Stauffer
patent: 4373791 (1983-02-01), Araki
patent: 4417139 (1983-11-01), Kusaka
patent: 4419574 (1983-12-01), Kawabata et al.

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