Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1986-04-29
1987-02-17
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
354406, G01J 120
Patent
active
046441484
ABSTRACT:
A focus detecting apparatus has, an imaging optical system for forming an image of an object on a predetermined plane, an array having a plurality of photoelectric conversion elements arranged at predetermined interval, a focus detecting optical system for directing to the photoelectric conversion element array the light beam from the object passed through the imaging optical system, and discrimination apparatus for discriminating the imaged condition of the image of the object on the predetermined plane on the basis of the signal output of the image of the object spatially sampled at a predetermined sampling interval by the focus detecting optical system and the photoelectric conversion element array. The focus detecting optical system and the photoelectric conversion element array are disposed a predetermined distance in the direction of the optical axis from the predetermined plane so that the imaged condition of the image of the object on the predetermined plane is different from the imaged condition of the image of the object spatially sampled by the photoelectric conversion element array.
REFERENCES:
patent: 3563634 (1971-02-01), Parks et al.
patent: 4185191 (1980-01-01), Stauffer
patent: 4297571 (1981-09-01), Utagawa et al.
patent: 4373791 (1983-02-01), Araki
patent: 4417139 (1983-11-01), Kusaka
Kusaka Yosuke
Shimomura Jun
Nelms David C.
Nippon Kogaku K. K.
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