Abstract: A bladed shutter comprises a plurality of shutter blades, also serving as a diaphragm, which are supported by a shutter opening ring and a shutter closing ring, both disposed in a concentric manner. The shutter opening ring is rotated in response to the actuation of a shutter release to drive the shutter blades in their opening direction. The rotation of the shutter opening ring is delayed by a governor. A shutter control circuit contained within a camera and including a photoelectric transducer element controls the rotation of the shutter closing ring, and enables its rotation to close the shutter blades when a photometric value reaches a proper exposure value. The speed of rotation of the shutter opening ring is changed under the control of the governor, by modifying the relative position of the governor to the shutter opening ring by means of a governor control circuit including a photoelectric transducer element which is provided externally of the camera.

Abstract: A focal plane shutter includes a pair of pinions which are integrally provided on the winding drums of a first and a second screen, and a drive gear which is adapted for meshing engagement with the pinions and adapted to rotate to wind up the screens when a film winding operation is desired. The gear is provided with a hiatus of a circumferential length which releases the meshing engagement between the gear and the pinions, and which is normally located opposite to the pinions except for the screen winding operation. During the screen winding operation, the gear initially engages the pinion on the winding drum of the first screen and then engages the pinion on the winding drum of the second screen, thus assuring that the first screen runs first and then the second screen follows, completing a winding operation of both screens while they are in overlapping relationship.