Focus detecting apparatus

Details Focus detecting apparatus Focus detecting apparatus

1985-07-29

1986-12-30

Adams, Russell E.

354407, G03B 300

Patent

active

046325328

ABSTRACT:
In a focus detecting apparatus for detecting the focus state of an objective lens on the basis of a light passing through the objective lens, a field lens is disposed near the predetermined imaging plane of the objective lens, and a projecting optical system for projecting the light from a light source onto an object through a first area of the pupil of the objective lens and a light-receiving optical system for forming a plurality of images on a sensor on the basis of lights passing through second and third areas of the pupil of the objective lens are disposed rearward of the image of the pupil of the objective lens formed by the field lens, whereby both focus detection based on the projected light and focus detection not based on the projected light can be accomplished.

REFERENCES:
patent: 4025785 (1977-05-01), Mueller
patent: 4357085 (1982-11-01), Niwa et al.
patent: 4511232 (1985-04-01), Yamada
patent: 4542971 (1985-09-01), Numata

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