Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1983-02-07
1985-12-17
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250201, 354408, G01J 120
Patent
active
045594465
ABSTRACT:
Disclosed is a focus detecting system in which the exit pupil of an imaging optical system is divided into a plurality of exit pupils by an optical device, a plurality of object images are formed by light beams passed through the divided exit pupils, photoelectric conversion element arrays each comprising a plurality of elements and putting out signals corresponding to the imaged states of the object images are disposed at locations whereat the object images are formed, and the relative positional relation between the object images is found by a signal processing operation cirucit by the use of the output signals from the photoelectric conversion element arrays, the minimum or maximum of such signals being processed, whereby the state of focus of the imaging optical system is discriminated.
REFERENCES:
patent: 4047022 (1977-09-01), Holle
patent: 4185191 (1980-01-01), Stauffer
patent: 4230401 (1980-10-01), Tokutomi et al.
patent: 4250376 (1981-02-01), Joseph et al.
patent: 4297571 (1981-10-01), Utagawa et al.
patent: 4336450 (1982-06-01), Utagawa et al.
Canon Kabushiki Kaisha
Westin Edward P.
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