Shutter opening and closing mechanism for cameras

Abstract

A shutter operating mechanism of a camera shutter which has an opening blade and a closing blade operated sequentially to open and close a shutter aperture for an exposure comprises an opening spring normally biasing the opening blade to move from a closed position in which the opening blade covers the shutter aperture to an open position in which the opening blade uncovers the shutter aperture; a second spring normally biasing the closing blade to move from a closed position in which the closing blade covers the shutter aperture to an open position in which the closing blade uncovers the shutter aperture; and a third spring normally biasing the closing blade to move from said open position to said closed position, the arrangement being such that when the shutter is charged, the opening blade and closing blade are in said closed position and when the shutter is released, the closing blade is moved under the bias of said second spring from said closed position to said open position, then the opening blade is moved under the bias of the opening spring from said closed position and to said open position, thereafter the closing blade is returned under the bias of said third spring from said open position to said closed position, thereby completing the exposure. The opening blade may then also be moved to closed position by a fourth spring. Furthermore, there are provided electrical contacts operated by the movement of the closing blade. When the closing blade is moved to uncover the aperture, the contacts are opened or closed and, after the exposure, are closed or opened again by returning movement of the closing blade to the first position.