wherein {TAIL ~ a portion} of the outer peripheral face of the diameter contracted portion is provided with {HEAD ~ a step portion} formed substantially by a flat face and subjected to wire bonding with the other of the exciting electrodes 
wherein { TAIL ~ a portion } of the outer peripheral face of the diameter contracted portion is provided with { HEAD ~ a step portion } formed substantially by a flat face and subjected to wire bonding with the other of the exciting electrodes
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH