Finder optical system for single lens reflex photographic camera

Details Finder optical system for single lens reflex photographic camera Finder optical system for single lens reflex photographic camera

1977-04-25

1978-12-26

Griffin, Donald A.

354155, G03B 1302, G03B 1912

Patent

active

041313550

ABSTRACT:
A finder optical system for single-lens reflex photographic cameras wherein an even number at least four of small reflecting surfaces are arranged in front of a pentagonal prism of a single-lens reflex photographic camera in such a way that an image of optical information such as graduations on diaphragm dial or shutter speed dial is reflected consecutively by said small reflecting surfaces, whereafter said image of optical information is projected around the field of view in a finder, said finder optical system being capable of projecting an image of optical information free from difference in dioptor at any desired position around said field of view in the finder by changing locations and/or relative tilting angles of said small reflecting surfaces.

REFERENCES:
patent: 3094911 (1963-06-01), Reiche et al.
patent: 3250195 (1966-05-01), Maitani
patent: 3757656 (1973-09-01), Kuramoto
patent: 3962710 (1976-06-01), Okuno et al.
patent: 4021830 (1977-05-01), Kanno

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