| 摘要 |
PURPOSE:To prevent an overexposure in a short distance photographing and to realize a compact size of the device by using a switching element as the element to carry out the light quantity control. CONSTITUTION:A converter CNV to raise the voltage of a DC power source E, a main capacitor MC connected parallel to the converter CNV, a series connecting body of a discharge tube Xe, a diode D, and a switching element FE1 connected parallel to the converter CNV and the main capacitor MC, and a capacitor CB connected parallel to the diode D are provided. Furthermore, a series connecting body of a resistance R3 connected to apply the negative voltage to an anode of the diode D and the positive voltage to a cathode, the primary winding side of a trigger coil T, and a trigger capacitor CT, which is connected parallel to the switching element FE1 is provided. And as the element to carry out the light quantity control, the switching element FE1 which can improve the light quantity control function and simplify the circuit composition easily is used. Consequently, an overexposure in a short distance photographing can be prevented, and the device can be made in a compact size. |
