| 摘要 |
PURPOSE:To control adequately an open release period according to a photographic mode, by actuating a mirror-up circuit and delay circuit by driving respective motors with signals generated through release operation so that while shutter blades are closed, aperture blades are stopped down to a prescribed aperture size. CONSTITUTION:Opening-closing control over shutter blades and that over aperture blades are both performed by driving respective motors with pulses while the direction of electric current is inverted. Then, the shutter is released after the mirror-up operation is completed in normal photographing with the mirror down, after a time a little bit longer than the longest time of the stop-down operation of aperture blades in mirror-up photographing, ater self-timer operation in self-timer photographing, and right after the release operation in mirror-up photographing during preview operation. |
