The light source for exposure emits light in accordance with the pulse width of the respective pulses of {TAIL ~ the pulse width modulating signal} outputted by {HEAD ~ the pulse width} modulating signal output device provided at the pulse width modulating device 
The light source for exposure emits light in accordance with the pulse width of the respective pulses of { TAIL ~ the pulse width modulating signal } outputted by { HEAD ~ the pulse width } modulating signal output device provided at the pulse width modulating device
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH