Then, an original light image is exposed to the thus charged surface of {TAIL ~ the drum} 1 through {HEAD ~ an exposure system} 4 thereby forming an electrostatic latent image 
Then , an original light image is exposed to the thus charged surface of { TAIL ~ the drum } 1 through { HEAD ~ an exposure system } 4 thereby forming an electrostatic latent image
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH