A length difference ld between {TAIL ~ the core length lm} and {HEAD ~ the coil length lc} is preferably equal to or greater than the former thickness tf 
A length difference ld between { TAIL ~ the core length lm } and { HEAD ~ the coil length lc } is preferably equal to or greater than the former thickness tf
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH