| 摘要 |
Disclosed herein is a piezoelectric resonator (11) utilizing a width expansion mode provided with a piezoelectric resonance part (12) having a rectangular section in which a ratio b/a of the length of each longer side to that of each shorter side is within a range of +/-10% about the following value:b/a=n(-1.47 sigma +1.88)(1)where a represents the length of each shorter side, b represents that of each longer side, sigma represents a Poisson's ratio and n represents an integer, and support members (16, 17) which are coupled to central portions of both shorter sides of the piezoelectric resonance part.
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