If such piezoelectric resonator element is excited to perform flexural vibration by the excitation electrode, the vibration includes not only a component in a predetermined vibrating direction but also {HEAD ~ a component} of vibration in {TAIL ~ a direction} that is orthogonal to the predetermined vibrating direction 
If such piezoelectric resonator element is excited to perform flexural vibration by the excitation electrode , the vibration includes not only a component in a predetermined vibrating direction but also { HEAD ~ a component } of vibration in { TAIL ~ a direction } that is orthogonal to the predetermined vibrating direction
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 OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH