Pentagonal prism and related optical structures for single lens

Details Pentagonal prism and related optical structures for single lens Pentagonal prism and related optical structures for single lens

1977-01-12

1978-12-05

Gonzales, John

354 59, 354155, 354225, G03B 708, G03B 1308

Patent

active

041283210

ABSTRACT:
A pentagonal prism holder for holding a pentagonal prism in horizontal and vertical directions is made of a transparent plastic material and at least a portion of the prism holder is formed as an element or elements of an auxiliary or supplemental optical system or a finder optical system. The auxiliary or supplemental optical system may be one that indicates photographic information in the finder view field, an optical system for photometry, an optical system for preventing a ghost from being observed in a viewfinder, or an optical system for preventing undesirable or stray light passing through an ocular lens from entering into the pentagonal prism. The element of the finder optical system may be a condenser lens or an ocular lens.

REFERENCES:
patent: 3760700 (1973-09-01), Trankner et al.
patent: 3840298 (1974-10-01), Okuno
patent: 3952321 (1976-04-01), Matui
patent: 3962710 (1976-06-01), Okuno et al.

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