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