Piezoelectric resonator and piezoelectric resonator part

摘要

A piezoelectric substrate is constituted by a piezoelectric material of an effective Poisson's ratio being less than 1/3. The substrate has a pair of opposite faces and the opposite faces are provide with a pair of vibrating electrodes in correspondence. The opposite faces of the piezoelectric substrate are rectangular respectively. The sum of the lengths Lc of the one faces in the opposite faces 1a, 1b and the length Wc of the other side of the same is limited within range 2.22 mm ≦  ≦ 2.24 mm or 2.34 mm ≦  ≦ 2.48 mm, said one faces being vertical each other. The areas Sc of the opposite faces are 1.22 mm² ≦ Sc ≦ 1.26 mm² or 1.35 mm² ≦ Sc ≦ 1.538 mm². Accordingly, though using the piezoelectric material of the effective Poisson's ratio being less than 1/3, vibration in the thickness extensional fundamental waves can be steadily utilized.