Focus detecting device for a camera

Details Focus detecting device for a camera Focus detecting device for a camera

1983-03-08

1985-01-22

Adams, Russell E.

G03B 300

Patent

active

044948492

ABSTRACT:
The focus detecting device herein disclosed is capable of detecting the amount of direction of defocus of an objective lens. The device includes a pair of photoelectric devices each disposed optically in parallel with an optical axis of the objective lens. The pair of the photoelectric devices are positioned so as to receive the light rays passed through two portions of the objective lens, respectively. The position along the optical axis on which the image plane of the objective lens is located is detected by means of comparing two images each detected by the photoelectric device.

REFERENCES:
patent: 4264810 (1981-04-01), Utagawa et al.
patent: 4307947 (1981-12-01), Jyoujiki

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