Abstract: Apparatus is disclosed for cyclic displacement of a camera shutter mechanism or the like between first and second end positions comprising an electromagnet displacing the shutter mechanism, the electromagnet comprising a pivotable armature pivotable between first and second positions, a plurality of blades, a rocker arm connected to the armature, a linkage connecting the rocker arm to the blades whereby pivoting of the armature can be translated into rotary movement of the blades, a biasing spring for biasing the armature towards a neutral position between the first and second end positions, a driver for ensuring that the armature reaches the first and second end positions, the driver comprising a permanent magnet for holding the armature in either of the first and second end positions and counteracting the biasing spring, and at least one coil for exerting a force on the armature upon activation of the coil, the force being sufficient to overcome the permanent magnet and the biasing spring.

Abstract: The invention relates to an automatic device for protecting the focal plane shutter of a camera when the camera is open. The film magazine of the camera, alternatively the camera back, is sensed by a member disposed in the camera body and directly or preferably indirectly controlling the shutter electronically. When the camera is opened, the sensing member emits a control pulse, which releases the opening part of the shutter. The opening and closing parts of the shutter then are located on both sides of the film gate of the camera where they are protected against damage. When the camera again is closed, the opening part of the shutter again must be cocked. Alternatively, also the closing part of the shutter can be released by a control pulse released when the camera is being closed. The protective device is lockable. (FIG. 2).