| 摘要 |
PURPOSE:To perform a stable shutter opening action by providing a means for switching an impressed voltage from high to low according to a trigger signal synchronized with the opening action of a shutter blade and a means for adjusting the transmission timing of the signal. CONSTITUTION:In the case that the actuation of the shutter vane 51 is standard, the output time of a 1st trigger signal STO is short and an energizing time t2 at high voltage is short. In the case that the actuation of the blade 51 is slow, the output time of the signal STO is long and the energizing time t2 at high voltage is long, then energizing is performed at low voltage for a specified time t3 until reverse energizing is performed with a 2nd trigger signal ST1. By changing the energizing time t2 at high voltage, when the high voltage is impressed on a shutter driving motor 87, uniform exposure is obtained and the dispersion of load caused by an individual difference such as weight, etc., of the vane 51 and the effect, etc., caused by the environmental factor such as a temperature, etc., are eliminated, thereby obtaining accurate exposure. |
