Camera viewfinder

Details Camera viewfinder Camera viewfinder

1979-03-02

1981-05-05

Hix, L. T.

350410, 350438, 350443, G03B 1308, G02B 304

Patent

active

042655293

ABSTRACT:
In a single lens reflex camera a viewfinder contains an eye-piece facing the exit surface of a roof type pentagonal prism. The eye-piece includes, from the pentagonal prism end, a positive lens and a negative meniscus lens slightly spaced from the positive lens. A concave surface on the positive lens faces the pentagonal prism. The positive lens is composed of a plastic synthetic resin, letting R.sub.1, R.sub.2, R.sub.3 and R.sub.4 denote the radii of curvature of the lens surface of the eye-piece in that order from the pentagonal prism and f denote the composite focal length of the eye-piece, the following inequalities are satisfied: ##EQU1##

REFERENCES:
patent: 2453218 (1948-11-01), Grey
patent: 3967290 (1976-06-01), Waaske
patent: 3992085 (1976-11-01), Momiyama
patent: 4062625 (1977-12-01), Fleischman et al.
patent: 4105308 (1978-08-01), Owen, Jr. et al.

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