The present invention allows image recording with plural light beams while eliminating alignment changes of {HEAD ~ light spots} on {TAIL ~ the inner face} of a drum 
The present invention allows image recording with plural light beams while eliminating alignment changes of { HEAD ~ light spots } on { TAIL ~ the inner face } of a drum
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH