| 摘要 |
A piezoelectric resonator has a structure that enables easy manufacturing thereof and that damps the fundamental wave of a thickness vertical vibration mode with high accuracy, while effectively utilizing the resonance characteristics based on the third harmonic. In the piezoelectric resonator, first and second excitation electrodes are located on two main surfaces of a piezoelectric substrate, lead-out electrodes and terminal electrodes are provided for each of the first and second excitation electrodes, and each of the terminal electrodes is arranged to occupy an area that is not less than about 10% of the area of an annular region which ranges over a normal-line distance of about 1.2 d to about 2 d from the outer peripheral edge of each of the excitation electrodes, where d is the diameter of each of the excitation electrodes.
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