US 4,395,104 AGranted

Electrically programmed shutter assembly

AssigneeBalda-Werke Photographische Gerate und Kunststoff GmbH & Co., KG

InventorKarl-Heinz Lange

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Abstract

An electronically programmed shutter assembly for a camera including an oing ring and a closing ring with locking shutter blades activated by rotation of the rings is provided. The locking ring is held in position upon rotation of the opening ring by a holding member attached to a holding magnet. The holding member is prevented from releasing the closing ring until the opening ring has travelled a minimum distance and the holding magnet has been demagnetized in order to insure attainment of a minimal lens opening prior to closing of the shutter blades. Insuring minimal lens opening will prevent the closing ring from closing the shutter immediately upon activation of the opening ring under intensive lighting conditions.

Claims8

Dependent claims

An electronically controlled programmed shutter assembly for a camera for insuring a predetermined minimum lens opening comprising:

an opening ring biased for rotation in a first rotational direction;
a closing ring mounted adjacent to said opening ring and biased for rotation in the first rotational direction;
shutter blades mounted on one of the opening and closing rings, the blades opening in response to rotation of the opening ring in the first rotational direction with respect to the closing ring and closing in response to rotation of the closing ring in the first rotational direction with response to the opening ring;
and
electromagnetic means for holding said closing ring in the first rotational direction;
said opening ring including holding means restricting rotation of the closing ring until the opening ring has traveled a predetermined distance, said holding means operatively engaged with the electromagnet means for insuring a predetermined minimal opening of the shutter blades for providing a minimum lens aperature by releasing said closing ring only after said opening ring has been displaced a predetermined distance.

3 more elements

Dependencies are inferred from the claim text.