Focus detector having first and second non-overlapping sensor se

Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems

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354407, G01J 120

Patent

active

046599177

ABSTRACT:
Disclosed is an optical system for detecting the state of focus in which the exit pupil of an image-forming optical system is optically divided into a plurality of exit pupils by an optical member having a beam splitting element, the image-forming light beams from the divided exit pupils are used to form a plurality of image intensity distributions regarding an object image, sensor series each having a plurality of sensors and putting out signals corresponding to the image intensity distributions are disposed at positions whereat the plurality of image intensity distributions are formed, and the output signals from the sensor series are used to detect the relative position of the image intensity distributions to thereby discriminate the state of focus of the image-forming optical system.

REFERENCES:
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patent: 3970842 (1976-07-01), Nanba et al.
patent: 4117325 (1978-09-01), Holle et al.
patent: 4185191 (1980-01-01), Stauffer
patent: 4258989 (1981-03-01), Tokutomi et al.
patent: 4265520 (1981-05-01), Tokutomi et al.
patent: 4443079 (1984-04-01), Oinoue

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