Camera electric shutter with mechanical delay device
AssigneeSeiko Koki Kabushiki Kaisha
InventorKiyoshi Kitai
Life of this patent
Estimating the term…
Abstract
An electric shutter in which an electrical circuit normally controls the automatic closing of the shutter lens aperture. A mechanical device in the shutter coactive with the electrical circuit closes the shutter lens aperture mechanically, automatically when the electrical circuit is deenergized or because insufficiently energized because of an exhausted power source or because of other reasons.
Claims3
In an electric shutter having a lense aperture, sector means operable to a position for opening the lens aperture and a position for closing the lens aperture, operating means to operate the sector means to the position opening the lens aperture and the position closing the lens aperture, control means to render the operating means effective to operate the sector means to open the lens aperture including automatic timing means to determine a delay period after which the sector means closes the shutter lens aperture, said timing means comprising an electromagnet, normally controlling said delay period, and including mechanical delay means normally rendered ineffective by said electromagnet and rendered effective by said electromagnet for effecting a delayed closing of the shutter lens aperture only when the electromagnet is insufficiently energized or completely deenergized.
Dependencies are inferred from the claim text.