Real image viewfinder which shifts prism ridge line away from ta

Details Real image viewfinder which shifts prism ridge line away from ta Real image viewfinder which shifts prism ridge line away from ta

1996-12-16

1998-04-14

Blankenship, Howard B.

Photography

With viewfinder

With prism

G03B 1302

Patent

active

057404852

ABSTRACT:
A real image viewfinder of an optical device includes an eye piece through which an optical axis may be viewed with respect to a target frame. The target frame may be used for centering an optical image on an image forming plane and also for autofocus of the optical device. The real image viewfinder includes a first prism for redefining an optical axis within the optical device. The first prism has a pair of reflective planes joined about a first ridge line. The first ridge line generally includes a number of manufacturing flaws which are noticeable by the photographer. Thus, viewfinder components are shifted by a predetermined amount to present the first ridge line in an area of the viewfinder which is different from the target frame as viewed through the eye piece. Likewise, the real image viewfinder includes a second prism having a second ridge line which is also shifted away from the target frame as viewed through the eye piece.

REFERENCES:
patent: 4926201 (1990-05-01), Mukai et al.
patent: 5091739 (1992-02-01), Kawamura

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