{HEAD ~ A shutter driving apparatus} drives a programmed shutter with a stepping motor, by using {TAIL ~ a driving current pulse} whose waveform has a leading half that gradually increases in amplitude and a trailing half having an amplitude smaller than the peak value of the pulse 
{ HEAD ~ A shutter driving apparatus } drives a programmed shutter with a stepping motor , by using { TAIL ~ a driving current pulse } whose waveform has a leading half that gradually increases in amplitude and a trailing half having an amplitude smaller than the peak value of the pulse
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