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