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 a component of {HEAD ~ vibration} in {TAIL ~ a direction} that is orthogonal to the predetermined vibrating direction 
in
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 a component of { HEAD ~ 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 OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH