| 摘要 |
<p>PURPOSE:To prevent an error operation by connecting a charging circuit to one end of a detecting switch provided at the lowermost end of a shutter, a transistor to the other end, and an FET to the charging circuit, and operation- processing the ON condition of the detecting switch. CONSTITUTION:The electromotive shutter device is composed of a charging circuit 14 in which a detector 12 to detect the ON condition of a detecting switch 6 is connected to one end of the detecting switch 6, a transistor Q1 connected to the other end of the detecting switch 6, a one-shot multivibrator 15 to generate pulse signals when the transistor Q1 is ON, an FET Q2 whose gate is connected to the charging circuit 14, and an operation processing means 16 to detect the ON condition of the detecting switch 6. And after the operation processing means 16 receives a reset output responding to the output of the transistor Q1 which is ON when the detecting switch 6 is ON, the ON condition of the FET Q2 is confirmed again, and the ON condition of the detecting switch 6 is detected.</p> |
