Patent
1974-11-01
1976-06-08
Hix, L. T.
354155, G03B 1302
Patent
active
039627101
ABSTRACT:
The viewfinder includes a pentagonal roof prism having a front non-reflecting surface and a rear light exit surface adjacent an eyepiece. A sub-prism is mounted on the front non-reflecting surface and includes an incident light entry surface, intermediate reflecting surfaces, one of which is substantially coplanar with the front non-reflecting surface of the pentagonal roof prism, and a final reflecting surface arranged to reflect light directly through the front non-reflecting surface and the light exit surface of the pentagonal prism into, or adjacent, the field of view of an operator looking through the eyepiece. An optical system, including a reflecting element positioned substantially further away from the body tube of the taking lens of the camera than is the final reflecting surface of the subprism, reflects light from a photographic information indication on the body tube through the light entry surface of the sub-prism for internal reflection and final reflection to the eyepiece through the pentagonal prism. The reflecting means of the optical system is substantially universally adjustible.
REFERENCES:
patent: 3524380 (1970-08-01), Yamada et al.
patent: 3675558 (1972-07-01), Kuramoto et al.
patent: 3687038 (1972-08-01), Kawakomi
patent: 3757656 (1973-10-01), Kuramoto
patent: 3800655 (1974-04-01), Uchida
Okuno Youichi
Yokota Hideo
Canon Kabushiki Kaisha
Hix L. T,.
O'Connor E. M.
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