{HEAD ~ This frequency modulation apparatus} is used in {TAIL ~ an image formation apparatus} having an image bearing body to be scanned by a laser beam 
{ HEAD ~ This frequency modulation apparatus } is used in { TAIL ~ an image formation apparatus } having an image bearing body to be scanned by a laser beam
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH