Patent ID: 7156564

Claim:
A blade driving device for use in cameras, comprising: a base plate having an exposure aperture; a blade member supported rotatably around a supporting shaft on the base plate for movement to a position withdrawn from the exposure aperture and a position facing the exposure aperture; and an electromagnetic actuator for driving the blade member, wherein the electromagnetic actuator includes a frame member joined to the base plate, a rotor which has a drive pin that exerts a driving force to the blade member and rotates within a predetermined angle range with one end of the rotor being supported by the frame member and the other end of the rotor being supported by the base plate, and an exciting coil wound around the frame member and the base plate, and the blade member is a shutter blade for opening and closing the exposure aperture, a diaphragm blade for stopping down the exposure aperture to a predetermined diameter, or an ND filter blade for reducing the amount of light by covering the exposure aperture.