Electric shutter for cameras

Claim 1

An electric shutter device for cameras comprising a shutter base plate adapted to be attached to a camera body, a shutter closing driving member rotatably supported on said shutter base plate and movable between a cocked position and an uncocked position, a locking member rotatably supported on said shutter base plate and engageable with said driving member for locking said driving member in the cocked position, an armature lever operatively related to said locking member, an electromagnetic device arranged adjacent to said armature lever, said electromagnetic device including a permanent magnet normally attracting said armature lever to retain said locking member in a position wherein said driving member is cocked, said armature lever being released from the permanent magnet to in turn release said locking member and said driving member when said electromagnetic device is energized, an exposure time controlling circuit connected to said electromagnetic device, a current source battery connected to said exposure time controlling circuit and capable of supplying an electric current to said electromagnetic device to energize said electromagnetic device when a proper exposure time determined by said exposure time controlling circuit has elapsed, and a manually operable device arranged adjacent to said locking member on said camera body for operating said locking member to release said driving member on actuation of the manually operable device.