| 摘要 |
PURPOSE:To prevent malfunction of camera control and deterioration of function by supplying a specific source voltage to a camera control circuit even while a main capacitor as a strobe light emission source is charged. CONSTITUTION:When the main capacitor C5 is charged with the voltage of a high voltage line l, the voltage at the connection point between a low voltage coil T1L and the collector of a transistor (TR) Q3 becomes a pulse signal which is about 20V high on the basis of a potential nearly equal to the potential of a ground line l0. this voltage V1 is applied to a smoothing capacitor C2 through the anode and cathode of a diode D2 and a resistance R8, made constant through a TR Q5 which is turned on with a charge control signal S3 and a Zener diode ZD, and applied to a system controller 20 and the plus power source input terminal + of a control circuit 30. Consequently, a DC-DC converter 10 is put in operation to supply electric power to the system controller 20 and control circuit 30 without any voltage drop even while the main capacitor C5 is charged. |
