Viewfinder for single lens reflex camera

Details Viewfinder for single lens reflex camera Viewfinder for single lens reflex camera

1979-08-16

1980-07-15

Griffin, Donald A.

G03B 1308

Patent

active

042125260

ABSTRACT:
A pentagonal roof reflecting viewfinder assembly for a single lens reflex camera is provided. A focussing plate and a first and second reflecting mirror are part of the assembly. The improvement includes a third aspherical reflecting mirror having a lesser curvature at its marginal portions than adjacent an apex of the surface. The apex being positioned above the reflective surface of the third mirror. An ocular is provided having at least two lens elements with one of the lens elements being tilted relative to the optical axis of the ocular.

REFERENCES:
patent: 2323005 (1943-06-01), Bertele
patent: 2980001 (1961-04-01), Sauer et al.
patent: 3656421 (1972-04-01), Ataka
patent: 3783764 (1974-01-01), Baker
patent: 3860940 (1975-01-01), Baker
patent: 4063261 (1977-12-01), Kuboshima

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