Diaphragm preselector for camera objective

Details Diaphragm preselector for camera objective Diaphragm preselector for camera objective

1977-02-16

1978-03-28

Gonzales, John

354274, G03B 902

Patent

active

040818110

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 an integral extension of a resilient 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 axially displaces the extension of the swing ring which is thereby made ineffectual and prevented from reducing the diaphragm aperture.

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

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