Electromagnetically driven shutter with focus adjusting function

摘要

In the disclosed electromagnetically driven shutter a shutter release produces a first flow of current that electromagnetically moves a rotor coil arranged in a magnetic field to a position where it unlatches an automatic focusing operation and where it is locked to prevent backward motion. Termination of the focusing condition starts an exposure control arrangement and initiates a second current flow that moves the rotor coil further to control opening and closing of the shutter blades. Thus, two successive current flows coordinate the focus operation and the exposure.