Viewfinder for single lens reflex cameras

Details Viewfinder for single lens reflex cameras Viewfinder for single lens reflex cameras

1979-04-12

1980-06-10

Griffin, Donald A.

354219, G03B 1302, G03B 1912 _

Patent

active

042069882

ABSTRACT:
A viewfinder for a single lens reflex camera of the T.T.L. light measurement type, wherein light measurement is apt to be affected by external light entering through an eyepiece, includes a diopter adjusting mechanism and an eyepiece shutter. The eyepiece is divided into at least a movable first optical element and a fixed second optical element. The diopter adjusting mechanism is capable of shifting the first optical element for diopter adjustment within a predetermined space which extends along the viewfinder optical axis and is at least partially common to a space that the eyepiece shutter occupies at an advanced position for blocking the viewfinder optical path. Operation of a manually operable member for shifting the eyepiece shutter toward the advanced positon causes the first optical element to be retracted toward the rear away from the predetermined space prior to the shift of the eyepiece shutter into the advanced position.

REFERENCES:
patent: 2766669 (1956-10-01), Weisse et al.
patent: 3613543 (1971-10-01), Mita et al.
patent: 3902183 (1975-08-01), Saito
patent: 3999196 (1976-12-01), Inoue
patent: 4047207 (1977-09-01), Altman et al.
patent: 4134661 (1979-01-01), Ishizaka et al.

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