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