Focus detecting apparatus

Details Focus detecting apparatus Focus detecting apparatus

1984-11-02

1986-10-21

Perkey, William B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250204, G03B 300, G01J 136

Patent

active

046182365

ABSTRACT:
In an apparatus wherein on the basis of a light passing through an objective lens, a plurality of images whose relative positional relation varies in accordance with the focus state of the objective lens are formed and these images are detected by photoelectric conversion element arrays and a predetermined operation is effected by the use of a plurality of photoelectrically converted signals obtained correspondingly to the respective images to thereby detect the focus state of the objective lens, there are provided first adder means for comparing the photoelectrically converted signals of the respective images in a predetermined relation and adding the smaller signal and second adder means for comparing the photoelectrically connected signals of the respective images in a predetermined relation and adding the greater signal and focus detection is effected by utilization of the result of the addition of one of the first and second adder means in accordance with the object condition, whereby accurate focus detection is made possible for any object.

REFERENCES:
patent: 4185191 (1980-01-01), Stauffer
patent: 4336450 (1982-06-01), Utagawa et al.
patent: 4473286 (1984-09-01), Watanabe et al.
patent: 4492449 (1985-01-01), Oinoue et al.

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