| 摘要 |
<p>PURPOSE:To obtain a device which has a function of determining the time when a shutter release button is unlocked in accordance with photographic conditions by charging electric power which corresponds to the refelction coefficient of a subject and a film photographic speed in an endoscope photographic system. CONSTITUTION:After a power source is turned on, a signal which corresponds to the charging voltage of a capacitor C14 is supplied to an energy detecting circuit 76 and a comparator 77. In accordance with the output of the circuit 76, a multiplying circuit 70 applies a voltage which corresponds to the reflection coefficient of a subject to an operational amplifier 78. Once a prescribed photographic film speed is set, an amplification output that corresponds to the photographic film speed is supplied to a comparator 80. When the input voltage to the comparator 77 exceeds a reference voltage, on the other hand, its output goes up to a level H. Then, when one of the outputs of the comparators 77 and 80 has the level H, pressing a release button turns on an SCR24 and at the same time, a strobe tube 18 emits a flash.</p> |
