| 摘要 |
PURPOSE:To prevent a shutter from being held open by driving a motor for shutter charging unless a shutter member is closed after a shutter second time. CONSTITUTION:A means SW4 detects a shutter closure signal from shutter second time control circuits A and B and also detects the closing operation of shutter closing circuits G5, OS3, and Q5 for driving an electromagnetic means MG3 and a shutter member, and a motor M responds to the output of the SW4 to charge the shutter. In this case, a timer CNT-2 which performs clocking operation for a specific time through the operation of the shutter closing circuits and generates an output the specific time later, and circuits FF2, G3, and FF4 which drive the motor M in response to the timer output are provided, and the motor is operated the timer time later unless the shutter member is closed to charge the shutter, which is prevented from being held open. |
