Patent
1993-12-06
1994-09-20
Gray, David M.
354219, 3542891, G03B 1912
Patent
active
053494040
ABSTRACT:
A finder indication optical system in a single lens reflex camera comprising an eyepiece, an indicator for indicating photographing information, a pentagonal prism having a third reflecting surface for reflecting light from an object, a light transmitting portion provided adjacent to the third reflecting surface for receiving a light beam from the indicator and transmitting the light beam therethrough, and a pentagonal prism exit surface from which emerge the light beam from the indicator transmitted through the light transmitting portion and the light from the object reflected by the third reflecting surface, and a deflection prism disposed between the eyepiece and the pentagonal prism and having an entrance surface opposed to the pentagonal prism exit surface and substantially parallel to the pentagonal prism exit surface and a deflection prism exit surface opposed to the eyepiece and substantially parallel to the surface of the light transmitting surface, the deflection prism being for receiving the light beam from the indicator emerging from the pentagonal prism exit surface by the entrance surface thereof and causing the light beam to emerge from the deflection prism exit surface to the eyepiece.
REFERENCES:
patent: 4833494 (1989-05-01), Ohsawa
patent: 5245375 (1993-09-01), Ohshita
Gray David M.
Nikon Corporation
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