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