Viewfinder optical system

Details Viewfinder optical system Viewfinder optical system

1990-05-18

1991-07-23

Adams, Russel E.

350410, 350481, 350569, G03B 1302

Patent

active

050347632

ABSTRACT:
A Keplerian or real image type of viewfinder optical system comprising an objective lens system and an eyepiece lens system for allowing observation of an intermediate image formed by the objective lens system. The viewfinder optical system has a space sufficiently widened for arranging the prisms for vertically and horizontally inverting an intermediate image by composing the eyepiece lens system of a first lens component having positive refractive power and a second lens component having negative refractive power, and locating the first lens component and the second lens component at locations rather close to the eye point of the eyepiece lens system without prolonging the focal length of the eyepiece lens system as a whole.

REFERENCES:
patent: Re17995 (1931-03-01), Mitchell
patent: 3587383 (1977-06-01), Ikezu
patent: 4265529 (1981-05-01), Yokota
patent: 4593984 (1986-01-01), Kimura et al.
patent: 4664485 (1987-05-01), Momiyama et al.
patent: 4731625 (1988-03-01), Nozawa

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