| 摘要 |
PURPOSE:To attain a correct exposure by controlling a main light emitting strobe with a dimming signal from a camera and controlling an auxiliary light emitting strobe with earlier one of the dimming signal from the camera and a signal of the auxiliary light emitting strobe itself. CONSTITUTION:While a Xenon discharging tube emits light, the electric charge of a capacitor C8 is discharged through a Xenon tune Xe, a thyristor SCR2, a Zener diode D4, and a resistance R16, and therefore, the cathode side of the Zener diode D4 is biased reverse, and a trigger pulse is not generated. Meanwhile, since it is inputted to one input of an NR2, the high level is outputted from the NR2 and is inputted to a terminal A of a monostable multivibrator MV1, and the electric charge of the capacitor C8 is discharged through a resistance R0. Therefore, the circuit between the anode and the cathode of the thyristor SCR2 is biased reverse, and the thyristor SCR2 is turned off to stop light emission. Thus, the auxiliary light emitting strobe is dimmed and controlled by the dimming signal of the camera when there is not a difference of flash time between the main light emitting strobe and the auxiliary light emitting strobe or the quantity of light of the auxiliary light emitting strobe is small. |
