Focus detecting device

Details Focus detecting device Focus detecting device

1995-02-22

1996-12-10

Perkey, W. B.

Photography

With exposure objective focusing means, focusing aid, or...

Optical detail with photoelement system

G03B 1336

Patent

active

055836046

ABSTRACT:
With a focus detection device equipped with focus detecting optical systems with focus detection areas both on and outside the optical axis of the photographic surface, a focus detection device suppresses vignetting of the focus detection light fluxes through incompatibilities with the exit pupil of the installed objective lens and has stable focus detection accuracy. With a focus detection device equipped with at least two focus detecting optical systems and on each focus detecting optical system, which forms the image that comes through the objective lens for each focus detecting optical system as a second image on a set of photoelectric transforming element arrays, and which carries out focus detection of the objective lens through relative position of the second image, reverse projections through the condenser lens of the diaphragm openings opposite the focus detecting optical systems with focus detection areas outside the optical axis of the photographic surface face toward the optical axis of the objective lens and cross the optical axis.

REFERENCES:
patent: 4908504 (1990-03-01), Karasaki et al.
patent: 4992819 (1991-02-01), Ohtaka et al.
patent: 5229807 (1993-07-01), Karasaki et al.
patent: 5257062 (1993-10-01), Moriyama
patent: 5393969 (1995-02-01), Ohsawa

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