| 摘要 |
PURPOSE:To suppress the continuous discharge of a flash discharging tube within a short period by providing the titled device with a charging command means of forcedly releasing the inhibition of charge to a capacitor based upon charge control at the time of detection based upon a continuous discharge detecting means to detect the continuous discharge of a flash discharge tube. CONSTITUTION:Since current flows through a resistor 29 at the time of continuous discharge, the cathode voltage of a Xe tube 18 reaches about 10-200V for about 1ms. Thereby, a resistor 20 is arranged between the cathode of the Xe tube 18 and the base of a transistor (TR) 17. When continuous discharge is started, current flows into the base of the TR 17 through the resistor 20, the TR 17 is turned on, the thyristor 8 is turned on, and current flowing from a DC/DC converter 3 flows into also a light emitting capacitor 11. Namely, charge to the capacitor 11 is executed simultaneously with charge to the capacitor 10. Thereby, the charging voltage to the capacitor 10 is not suddenly boosted and the coninuous discharge can be ended within a short period. |
