{TAIL ~ The frequency modulation apparatus} 2, wherein said predetermined fluctuation range is {HEAD ~ ±2.0%} or less for the reference clock in said image forming area on said image bearing body 
{ TAIL ~ The frequency modulation apparatus } 2 , wherein said predetermined fluctuation range is { HEAD ~ ±2.0 % } or less for the reference clock in said image forming area on said image bearing body
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH