| 摘要 |
<p>PURPOSE:To minimize the fault of keeping the shutter opened by forcibly charging a driven shutter mechanism by means of a motor when the drop of source voltage for driving shutter mechanism is detected. CONSTITUTION:The voltage drop of an electric source battery is detected with a source voltage detecting circuit E, and the output of the comparator CMP of the circuit E inverts to a high level. When a front curtain travel start signal is outputted from a counter CNT-1 and an AND gate G2 is opened by a flip-flop FF3, a flip-flop FF4 is set. Then, a transistor Q6 goes on, and a motor M for charging shutter mechanism turns, whereby one-frame winding of a film and shutter charging even when the shutter second time is not elapsed yet are forcibly accomplished. Hence, the fault accompanied with the shutter which is held opened when the source voltage drops is minimized.</p> |
