Focus detection apparatus

Details Focus detection apparatus Focus detection apparatus

1988-09-27

1990-04-10

Hix, L. T.

354406, G03B 300

Patent

active

049164732

ABSTRACT:
A focus detection apparatus for a camera comprising: a condensor lens being arranged close to or behind a predetermined focal plane of an objective lens of the camera. A pair of image separation members for separating the image of an object formed on the predetermined focal plane by use of light having been passed through said objective lens into two images which are arranged behind the condensor lens symmetrically with respect to the optical axis of the objective lens, wherein the correlation between the two images formed separately is measured in order to detect the focus condition of the objective lens; said image separating members including a mask members for projecting the exit pupil of the image separation members within an exit pupil of a cata-dioptric lens system as the objective lens.

REFERENCES:
patent: 4322616 (1982-03-01), Fukuhara et al.
patent: 4370551 (1983-01-01), Fukuhara et al.
patent: 4526458 (1985-07-01), Kawamura et al.
patent: 4794416 (1988-12-01), Mukai et al.

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