Viewfinder of the real image type

Details Viewfinder of the real image type Viewfinder of the real image type

1989-02-24

1991-03-12

Brown, Brian W.

G03B 1308

Patent

active

049996584

ABSTRACT:
A viewfinder of the real image type which is compact and high in performance and especially in dust-proof performance and can be produced at a low cost. The viewfinder comprises an indication mask for making an in-viewfinder indication on or near an image forming plane of an objective. The indication mask is disposed in an enclosed spacing defined by an eyepiece, the objective, and first and second mirror holders coupled airtight to each other. First to fourth mirrors are disposed in the enclosed spacing at positions corresponding to reflecting faces of a Porro prism of a Keplerian viewfinder system. The first and fourth mirrors are securely mounted or formed on the first mirror holder while the second and third mirrors are securely mounted on the second mirror holder. The objective and the eyepiece are provided airtight on the first mirror holder in an opposing relationship to the first and fourth mirrors, respectively. Light introduced in via the objective is reflected successively by the first to fourth mirrors in the enclosed spacing, and an image formed by the light is observed by way of the eyepiece.

REFERENCES:
patent: 2909109 (1959-10-01), Back
patent: 3476011 (1969-11-01), Mitchell
patent: 4104663 (1978-08-01), Yamazaki et al.
patent: 4119982 (1978-10-01), Imura et al.

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