| 摘要 |
PURPOSE:To prevent the reduction of the quantity of emitted light due to the lack of charge by providing an FET in the discharging loop of a main capacitor through a flash discharging tube and providing a means which causes an operating voltage generating means which applies an operating voltage to the FET to generate the operating voltage repeatedly at a continuous period. CONSTITUTION:A DC-DC converter 1 is provided with an oscillating transformer 13 and an oscillating transistor TR14 and converts a DC power 12 to a boosted DC. A flash discharging tube 3 consumes the photoelectric charge of a main capacitor C2 to emit light, and an FET4 is connected in series to the discharging tube 3. An operating voltage control means 5 controls the operating voltage of the FET4. An operation control means 7 causes an operating signal generating circuit 11 to generate an operating signal, which operates the means 5 periodically, at a certain period by the switching operation of a start switch circuit 10. Continuous light emission is performed repeatedly by the electric charge of the capacitor C2 due to one charging in this manner, and the reduction of the quantity of emitted light which is caused by a lack of charge due to the consumption of a power source battery is prevented to eliminate a lack to the quantity of emitted light to an object. |
