| 摘要 |
<p>PURPOSE:To confirm the incorrect exposure due to light emission of only one lamp by allowing the second light emitting tube to emit light after a light emission detecting circuit, which detects light emission of the first light emitting tube, detects light emission of the first light emitting tube. CONSTITUTION:When light emission of a main light emitting tube 34 starts, the voltage of a main capacitor 15 starts falling. By this voltage fall, the base current of a transistor TR48 is flowed from a capacitor 51 to a resistance 46, a capacitor 44, and the main light emitting tube 34 to make the TR48 conductive, and the current is flowed to the power source capacitor 51 of the second trigger circuit, the TR48, a resistance 47, and the gate of a thyristor 28 to make the thyristor 28 conductive. When the thyristor 28 is made conductive, the trigger electrode of an auxiliary light emitting tube 32 is triggered, and the light emitting tube 32 starts light emission. An object is illuminated with illumination of both light emitting tubes, and its reflected light has the quantity integrated in a dimming circuit 52; and when the quantity of this light reaches a prescribed value, the dimming circuit 52 transmits a light emission stop signal to the gate of a thyristor 42.</p> |
