| 摘要 |
PURPOSE:To utilize a capacitor used for other purposes of a device without exclusively providing a capacitor for a power source for driving a photometry circuit which outputs a light emission stop signal for stopping the flash light emission at the time of attaining a specified received light quantity by receiving reflected light from an object in a light control strobocope. CONSTITUTION:Since power charged in a commutation capacitor C8 is used as a power supply to the photometry circuit LD, a transistor TR4 is turned on when a flash start signal is outputted, and charge is performed to voltage decided by a Zener diode ZD2 in the capacitor C11 for the photometry circuit LD so as to drive the photometry circuit LD. When the light emission stop signal is outputted from the photometry circuit LD, thyristor SCR3 is turned on, the photometry circuit LD is short-circuited and the thyristor SCR3 is turned off. |
