Field frame changeover mechanism for viewfinder

Details Field frame changeover mechanism for viewfinder Field frame changeover mechanism for viewfinder

1997-08-26

1999-02-23

Metjahic, Safet

Photography

With viewfinder

Selective or adjustable viewfinder field

396435, G03B 1702

Patent

active

058753648

ABSTRACT:
A field frame changeover mechanism suitable for a single-lens reflex camera, which allows clear confirmation of the photo range without increasing the size of the camera. The mechanism has darkening plates movable between a darkening position where the plates cover a part of the focusing screen and an open position where the focusing screen is uncovered by the plates. When the mirror which reflects the light transmitted from the photo-taking lens of the camera to the optical system of the viewfinder of the camera moves from an observation position located in the path of light transmitted through the photo-taking lens to a photo-taking position, the darkening plates retract from the locus of the mirror's movement in a correlated manner.

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patent: 5398088 (1995-03-01), Yamazaki et al.
patent: 5506647 (1996-04-01), Sakamoto et al.

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