| 摘要 |
<p>PURPOSE:To set the rate of contribution to a photograph as desired and make the respective quantities of emitted light controllable by segmenting the integrated value of the quantity of reflected light which is correct exposure by the number of flash devices, and controlling plural flash devices in a cascade system according to a reference value. CONSTITUTION:When a synchronizing switch SW2 closes, a xenon tube A1 emits light, and the reflected light from an object is detected by a phototransistor D, and the light emission starting of the 2nd stage xenon tube A2 is controlled together with a light emission stopping circuit Q1 via a comparator G1 in which a prescribed reference value has been set. In the similar manner, the quantities of emitted light of multiple flash tubes such as xenon tube A3 are cascade-controlled, and the interference by the simultaneously emission of the flash tubes with themselves is prevented. Hence, the integrated value of the quantities of reflected light of correct exposure are divided by setting the rate of contribution to photographs as desired and based on this reference value, the quantity of light emission is controlled.</p> |
