Focus detecting optical system and camera provided with the...

Details Focus detecting optical system and camera provided with the... Focus detecting optical system and camera provided with the...

2005-01-25

2005-01-25

Perkey, W. B. (Department: 2851)

Photography

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

Optical detail with photoelement system

C348S345000

Reexamination Certificate

active

06847784

ABSTRACT:
A focus detecting optical includes a condenser lens placed in the proximity of a preset imaging plane equivalent to the imaging plane of a photographic lens, a pair of aperture stops dividing the pupil of the photographic lens placed on the exit side of the condenser lens into two areas, and a pair of re-imaging lenses for forming two secondary object images corresponding to the aperture stops, and satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?0.45<|mg|<0.75in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.75<|R1/R2|<1.25in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?|R3/R4|≦0.02in-line-formulae description="In-line Formulae" end="tail"?where mg is an imaging magnification of the focus detecting optical system, R1is the radius of curvature of the entrance surface of the condenser lens, R2is the radius of curvature of the exit surface of the condenser lens, R3is the radius of curvature of the entrance surface of each of the re-imaging lenses, and R4is the radius of curvature of the exit surface of each of the re-imaging lenses.

REFERENCES:
patent: 4474448 (1984-10-01), Momiyama
patent: 4699493 (1987-10-01), Koyama et al.
patent: 4716431 (1987-12-01), Shindo
patent: 4849782 (1989-07-01), Koyama et al.
patent: 5745805 (1998-04-01), Iyama
patent: 6453124 (2002-09-01), Morimoto et al.
patent: 60-032012 (1985-02-01), None
patent: 62-032013 (1987-02-01), None

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