View finder system for a single lens reflex camera

Details View finder system for a single lens reflex camera View finder system for a single lens reflex camera

1975-10-02

1977-10-11

O'Connor, Edna M.

354155, G03B 1306, G03B 1912

Patent

active

040539121

ABSTRACT:
A view finder system for a single lens reflex camera which provides in the field of the finder an image of a photographic information indicator such as a distance adjusting ring, diaphragm adjusting ring and the like movably mounted in the lens barrel which is connected to the camera body. The view finder includes a pentagonal roof prism in combination with supplementary optical means optically connected thereto, said supplementary optical means comprising a sub-prism having an exit face cemented to the front non-reflecting face of the pentagonal roof prism, an entrance face and a reflecting face, and a mirror element spaced apart from the sub-prism. The mirror element is arranged above the sub-prism to face down optically both the indicator and the sub-prism, so that a light beam from the indicator is reflected by the mirror element to the sub-prism and thereby directed through the pentagonal roof prism to provide an image of the indicator in the field of finder.

REFERENCES:
patent: 3250196 (1966-05-01), Ot et al.
patent: 3524380 (1970-08-01), Yamada
patent: 3675558 (1969-10-01), Kuramoto
patent: 3687038 (1972-08-01), Kawakami
patent: 3800655 (1974-04-01), Uchida
patent: 3840298 (1974-10-01), Ohuno

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