MOTOR DRIVEN SHUTTER FOR CAMERA

摘要

PURPOSE:To permit automatic opening and closing of barriers without providing a motor to be exclusively used for opening and closing the barriers and to reduce the size and cost of the titled shutter by executing the opening and closing operations of the barriers covering the front face of a lens by means of the same motor before and after the actuation of a shutter. CONSTITUTION:Detention of a ratchet wheel 7 by a detaining lever 8 is released and a driving ring 1 and a distance ring 4 are turned right by the forward run of a step motor 2 when an electromagnet 9 is energized as a user operates a release button. The electromagnet 9 is demagnetized and the ring 4 is detained so that a photographing lens is positioned to the focal position when the ring comes to the set focal point. The barriers 12, 13 which are held closed are opened by the gear connection of an interlock gear 10 and a tooth-laced gear 11 when the driving ring 1 in the lens actuation range is turned right. The step motor 2 runs backward when a preset aperture quantity is attained. The ring 1 is then turned left to end the exposing action. The barriers 12, 13 return to the original positions.