| 摘要 |
<p>PURPOSE:To shorten the recycle time from the flash light emission to the completion of recharge of a main capacitor and operate stably circuits other than a boosting circuit, by supplying power to the boosting circuit and other circuits alternately repeatedly. CONSTITUTION:In accordance with the release of a shutter, the flash light emission due to a main capacitor C and a discharge tube FT is performed, and a timer circuit 7 having a timer period longer than the time of the flash light emission starts the operation. By the output of this timer circuit 7, the output of a NAND gate G1 becomes low-level, and the power supply to a boosting transformer 2 is cut off, and the dimming operation due to a dimming circuit 8 without the influence of the oscillation noise of the transformer is performed alternately. If this dimming is in a bad condition and the output of a dimming confirming circuit 9 becomes high-level, a monostable multivibrator formed with an oscillation transistor Q5 and etc. is oscillated, and the power supply to a warning LED and the power supply to the transformer 2 due to the output inversion of the gate G1 are performed alternately, and the LED is lit continuously well, and the recycle time due to charging of a capacitor C1 is shortened.</p> |
