Diaphragm preselector for camera objective

Details Diaphragm preselector for camera objective Diaphragm preselector for camera objective

1976-12-21

1978-03-14

Gonzales, John

354274, G03B 902

Patent

active

040794016

ABSTRACT:
An iris diaphragm of a reflex camera, spring-biased into a wide-open position, is settable to a preselectable stop position via a linkage including a cam follower on a swing ring oscillatable about an off-axial fulcrum. The cam follower coacts with a cam disk which is manually rotated against the force of a restoring spring during a windup operation and, upon subsequent release, displaces the cam follower and the swing ring which entrains the setting ring of the diaphragm through a yieldable coupling to the selected stop position and restores it to the wide-open position in the course of a revolution. During windup, a beveled flank on the high dwell of the cam disk oscillates the swing ring and entrains the setting ring for another brief but ineffectual reduction in the diaphragm aperture.

REFERENCES:
patent: 3715965 (1973-02-01), Alfredsson

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