| 摘要 |
<p>PURPOSE:To reduce the racing of shutter second time by flowing the current of the exent of negating the attraction force of a permanent magnet to a coil to put its iron piece in a stable position at the shutter setting then breaking the current supply to let the iron piece be completely attracted. CONSTITUTION:When open shutter charge is accomplished, a switch S1 goes ON. When a set lever 1 turns ON a switch S3 at the shutter release, a transistor T1 goes ON and at the same time a transistor T2 also goes ON and the specified voltage is applied to a coil L by a constant voltage diode ZD, whereby the attraction force of a permanent magnet 4 is negated. Hence, an iron piece 3 is pressure contacted to an iron core 5 in a stable state. Next, when the set lever 1 returns to turn OFF the switch S3, the voltage of the coil L becomes zero and the iron piece 3 is perfectly attracted, whereby the occurrence of racing of the shutter second time may be prevented.</p> |
