The invention provides an energy-trapped thickness extensional vibration mode piezoelectric resonator that utilizes a harmonic of a thickness extensional vibration mode and can be fabricated in smaller size. The resonator exhibits good resonant characteristics that are hardly affected by portions mechanically held. An energy-trapped thickness extensional vibration mode piezoelectric resonator 1 comprises a rectangular piezoelectric strip 2, first and second excitation electrodes 3, 4 formed on both faces of the piezoelectric strip 2, and an internal electrode disposed inside the piezoelectric strip. The first and second excitation electrodes 3 and 4 are located on opposite sides of the piezoelectric strip 2. The internal electrode is located opposite to the first and second excitation electrodes 3, 4. The resonator is designed so that L/d is not less than 14, where L is the dimension of the piezoelectric strip 2 in the longitudinal direction, t is the thickness, and d = t/n.
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机译：本发明提供了一种能量捕获的厚度延伸振动模式压电谐振器，该压电谐振器利用了厚度延伸振动模式的谐波并且可以以较小的尺寸制造。该谐振器表现出良好的谐振特性，几乎不受机械固定部分的影响。能量俘获的厚度延伸振动模式压电谐振器1包括矩形压电条2，形成在压电条2的两个面上的第一和第二激励电极3、4以及设置在压电条内部的内部电极。第一和第二激励电极3和4位于压电条2的相对侧。内部电极与第一和第二激励电极3和4相对。谐振器设计成L / d不小于3。参照图14，其中L是压电条2在纵向上的尺寸，t是厚度，并且d ＝ t / I n。
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