The optical elements 202, 203, 205, and 207 are integrally rotated around the axis of {TAIL ~ the drum} 120 by a main scanning motor 230, thus scanning a photosensitive material 110 held on the inner face of the drum 120 with {HEAD ~ the light beams} 
The optical elements 202 , 203 , 205 , and 207 are integrally rotated around the axis of { TAIL ~ the drum } 120 by a main scanning motor 230 , thus scanning a photosensitive material 110 held on the inner face of the drum 120 with { HEAD ~ the light beams }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD