This causes the dispersion distribution patterns of magnetic flux such as the shape of magnet poles and the position of the magnet pole relative to the circumferential direction of {TAIL ~ the roller shape magnetic body}, thereby causing an undesirable decrease of {HEAD ~ the performance} of said roller shape magnetic body 
This causes the dispersion distribution patterns of magnetic flux such as the shape of magnet poles and the position of the magnet pole relative to the circumferential direction of { TAIL ~ the roller shape magnetic body } , thereby causing an undesirable decrease of { HEAD ~ the performance } of said roller shape magnetic body
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH