Viewfinder device including first and second prisms to...

Details Viewfinder device including first and second prisms to... Viewfinder device including first and second prisms to...

2005-06-07

2005-06-07

Garber, Wendy R. (Department: 2612)

Television

Camera, system and detail

Optics

C348S335000, C348S337000, C348S338000, C359S366000, C396S382000, C396S384000

Reexamination Certificate

active

06903774

ABSTRACT:
A thin viewfinder device includes, in order an object side to a viewing eye side, a first prism, and a second prism disposed separately from the first prim across an air gap. The first prism, the air gap and the second prism are arranged in such a manner that an object light flux obtained within a viewing field passes through the first prism, the air gap and the second prism so as to reach the viewing eye, while an object light flux obtained outside the viewing field is totally reflected by surfaces of the first prism so as to be prevented from reaching the viewing eye.

REFERENCES:
patent: 3911457 (1975-10-01), Okuno
patent: 3952321 (1976-04-01), Matui
patent: 4118722 (1978-10-01), Matsui
patent: 4682237 (1987-07-01), Kato et al.
patent: 5701203 (1997-12-01), Watanabe

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