Patent ID: RE42009

Claim:
A piezoelectric resonator vibrating at a predetermined frequency, the resonator comprising: a substrate having a cavity formed therein; and a vibration portion formed in a position such that the vibration portion covers the cavity formed in the substrate, wherein the vibration portion includes: a piezoelectric body; an upper electrode formed in a direction of a top surface of the piezoelectric body; a lower electrode formed in a direction of a bottom surface of the piezoelectric body; and a spurious component control layer, wherein the spurious component control layer is formed in a position in a vicinity of a maximum distortion point in a portion in which the piezoelectric resonator vibration portion is supported, and formed in a position in a vicinity of a maximum vibration point in a portion in which the piezoelectric resonator vibration portion is not supported, in order to shift a frequency at which a spurious component occurs so as to prevent the spurious component from occurring between a resonance frequency and an antiresonance frequency, wherein the maximum distortion point in the portion in which the piezoelectric resonator vibration portion is supported is a node in a vibration displacement distribution, and wherein the maximum vibration point in the portion in which the piezoelectric resonator vibration portion is not supported is an antinode in the vibration displacement distribution.