Focus detecting device with shading reduction optical filter

Details Focus detecting device with shading reduction optical filter Focus detecting device with shading reduction optical filter

1984-10-11

1987-06-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, G01J 120

Patent

active

046706453

ABSTRACT:
This specification discloses a focus detecting system in which a plurality of images are formed on the basis of light beams passing through different portions of the pupil of an objective lens and the focus state of the objective lens is detected from the relative positional relation of these images and wherein filters of which the density distribution varies along the direction of arrangement of photoelectric conversion elements are disposed in front of photoelectric conversion element arrays for detecting the distributions of quantity of light of the images, thereby accomplishing shading correction.

REFERENCES:
patent: 3981565 (1976-09-01), Karasawa
patent: 4187002 (1980-02-01), Roziere
patent: 4247763 (1981-01-01), Stauffer
patent: 4547663 (1985-10-01), Kitagishi

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