| 摘要 |
PURPOSE:To simplify constitution by controlling a shutter device properly without requiring a switch means for detecting the position of each shutter blade, by using one inversion type FF circuit and two OR circuits in combination. CONSTITUTION:A D type FF circuit FF1 has a data input terminal D connected to an output terminal Q', and a control signal corresponding to the width of exposure time is supplied to the clock input terminal CK. The input terminal a1 of an OR circuit ORa is connected to the output terminal Q of the FF circuit FF1, and the said control signal is supplied to the input terminal a2. The input terminal b1 of an OR circuit ORb is connected to the output terminal Q' of the FF circuit FF1, and the said control signal is supplied to the input terminal b2. The 1st and 2nd driving circuits SDa and SDb provided with coils La and Lb driving the 1st and 2nd unshown shutter blades are controlled by the outputs of the OR circuit ORa and ORb. |
