| 摘要 |
PROBLEM TO BE SOLVED: To provide a longitudinal thickness piezoelectric resonator, with which satisfactory resonance characteristics can be provided by shifting the spurious wave of a thickness-shear mode to the side of high frequency, in the piezoelectric resonator utilizing a longitudinal thickness vibrating mode. SOLUTION: In a longitudinal thickness piezoelectric resonator 1 utilizing longitudinal thickness vibrating mode, with which first and second exciting electrodes 3 and 4 are formed on an upper surface 2a and a lower surface 2b of a piezoelectric body 2 polarized in the direction of the thickness and an internal exciting electrode 5 is formed at the intermediate height position of the piezoelectric body 2, a notched part 2e is formed on at least one ridge line part when a plurality of ridge line parts formed from the upper surface 2a, the lower surface 2b and first and second end faces 2c and 2d of the piezoelectric body 2 are watched from a cross section orthogonal to the upper surface 2a, the lower surface 2b and the first and second end faces 2c and 2d.
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