| 摘要 |
PURPOSE:To emit light always with the maximum electric charging energy and to remove the unevenness of fixing by automatically adjusting the starting time for charging so that a charge completion voltage Ve is obtained at the timing of a trigger signal FT. CONSTITUTION:When a trigger signal FT arrives before the completion of charging, a CNT 16 counts up a clock CL and outputs a time Tm required up to the ON of the signal FT after turning on a flash-enable signal FO and a constant -Ta is added to the output Tm by an adder 17 to form Tm-Ta= Tc. The output Tc is added to the contents Td (to be triggered before charging) of a register AR 19 by an adder 18 to update the contents Td and specify the counting value of a PSC 20, the PSC 20 counts up the clocks CL up to the specified Td, so that the charge completion signal Ve is obtained and the output timing of a charging signal CH is delayed so that the completion signal coincides with the trigger signal FT. Under said constitution, the charging voltage and light emitting energy are not changed and stable flash fixing can be attained. |
