Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1978-12-29
1982-05-11
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250204, G01J 120
Patent
active
043295770
ABSTRACT:
A focus detecting device which performs focus detection in such a manner that an image of an object formed through an image forming lens is received by an array of many electric charge storing type photo-sensors and, under such a condition, the image is electrically scanned by extracting, in a time serial manner, the output of each photo-sensor, and then the sharpness of the image is detected from a scanning output thus obtained; or that two images of the object which are formed through a range-finding optical system with an apparent parallax corresponding to distance to the object are received by different arrays of such photo-sensors respectively and, under such a condition, the two images are electrically scanned separately from each other by extracting, in a time serial manner, the output of each of the photo-sensors and scanning outputs thus obtained are compared with each other to detect the relative parallax of the two images. In this device, for making the scanning output of the photo-sensor array or arrays always correct irrespective of variation in the brightness of the object, the scanning recycle time duration of the photo-sensor array or arrays is automatically adjusted according to the brightness of the object; and, accordingly, the electric charge storing time of each photo-sensor in the photo-sensor array or arrays are automatically adjusted thereby.
REFERENCES:
patent: 4004852 (1977-01-01), Pentecost
patent: 4005443 (1977-01-01), Albrecht
patent: 4047187 (1977-09-01), Mashimo et al.
patent: 4078171 (1978-03-01), Stauffer
Asano Noriyuki
Niwa Yukichi
Ohwada Mitsutoshi
Tsuda Shin
Yamagata Takaaki
Canon Kabushiki Kaisha
Nelms David C.
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