Field frame changeover mechanism for viewfinder

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

1994-08-26

1996-04-09

Gellner, Michael L.

354 94, 354222, G03B 1702, G03B 3700, G03B 1310

Patent

active

055066470

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.

REFERENCES:
patent: 3490844 (1970-01-01), Sapp, Jr. et al.
patent: 4678300 (1987-07-01), Beach
patent: 4682870 (1987-07-01), Atkinson
patent: 4716427 (1987-12-01), Shyu
patent: 5066971 (1991-11-01), Kodaira
patent: 5086311 (1992-02-01), Naka et al.
patent: 5255030 (1993-10-01), Mukai et al.

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