Finder system for a single lens reflex camera

Details Finder system for a single lens reflex camera Finder system for a single lens reflex camera

1998-03-27

1999-08-31

Perkey, W. B.

Photography

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

Having viewfinder

396382, 396386, 359646, G03B 1308, G02B 2500

Patent

active

059465050

ABSTRACT:
A finder system for a single lens reflex camera includes a focusing screen having a split prism, a penta roof mirror and an eyepiece lens system. The penta roof mirror has a hollow housing made of plastic material in the shape of a pentagonal prism whose three surfaces are coated inside to reflect light. The eyepiece lens system includes two plastic lenses, each of which has a different dispersion.

REFERENCES:
patent: 3587383 (1971-06-01), Ikezu
patent: 4437750 (1984-03-01), Ikari
patent: 4593984 (1986-06-01), Kimura et al.
patent: 5066115 (1991-11-01), Sugawara
patent: 5136427 (1992-08-01), Sugawara

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