| 摘要 |
A piezoelectric resonator includes: a piezoelectric plate having a vibrating portion surrounded by a peripheral portion; and an excitation electrode on the piezoelectric plate, wherein long sides of the vibrating portion and excitation electrode are parallel to a piezoelectric plate long side. Assuming a piezoelectric plate long side length X, a vibrating portion thickness t, a vibrating portion long side length Mx, an excitation electrode long side length Ex, and a piezoelectric plate flexure vibration wavelength lambda, lambda/2=(1.332/f)-0.0024 (piezoelectric resonator resonance frequency f), (Mx-Ex)/2=lambda/2, Mx/2={(A/2)+(1/4)}lambda (where, A is a positive integer), and X>=20t. A protruding portion is disposed on a vibrating portion extension line and parallel to a vibrating portion short side. Assuming a protruding portion length Dx, Dx=(lambda/2)×m (where, m is a positive integer). Assuming a distance Sx between the vibrating and protruding portions, Sx=(lambda/2)×n±0.1lambda (where, n is a positive integer).
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