Offset Piezoelectric Resonator Layout for Ripple Suppression
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Solution Overview
Problem
Piezoelectric resonators experience instability in oscillation frequency due to increasing harmonic ripples in longitudinal, transverse, and planar-extensional vibration modes, leading to lack of stability in oscillation frequency.
Innovation Solution
A piezoelectric component design where the center of the piezoelectric element is offset from the intermediate point between the support portions, reducing the symmetry of the vibrating electrode-bearing region and shifting or reducing ripples within the oscillation frequency range, thereby stabilizing the oscillation frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the piezoelectric element is installed symmetrically with its center coinciding with the intermediate point between support portions, then the structural symmetry is maintained, but harmonic components (ripples) occur in the oscillation frequency range causing instability
Solution Approach 1:
The patent applies asymmetry by intentionally offsetting the center of the piezoelectric element from the intermediate point between the first and second support portions. This asymmetric positioning reduces the degree of symmetry in the vibrating electrode-bearing region, which shifts ripple frequencies out of the oscillation frequency range or reduces ripples within the oscillation frequency range, thereby stabilizing the oscillation frequency.
2Reliability
If the center of the piezoelectric element is offset from the intermediate point between support portions, then ripple frequency is shifted out of oscillation frequency range or ripples are reduced, but the structural symmetry is lowered
Solution Approach 1:
The patent deliberately introduces asymmetry into the system by offsetting the piezoelectric element center. This asymmetric configuration is designed to suppress harmful harmonic components (ripples) that would otherwise occur in the oscillation frequency range, demonstrating that controlled asymmetry can improve oscillation stability even though it reduces structural symmetry.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively suppresses ripples in the oscillation frequency range, ensuring stable oscillation frequency by adjusting the position of the piezoelectric element's center relative to the support portions, even when the ends are misaligned, maintaining energy-trapping vibration modes without damaging the intersecting regions.
Implementation Method 1
a piezoelectric element having an elongated shape, comprising excitation electrodes disposed on one principal surface and the other principal surface thereof, respectively, the excitation electrodes facing each other
Implementation Method 2
an electrically conductive joining material which joins the first support portion and the second support portion to the ends of the piezoelectric element, respectively
Data Source
AI summary
A piezoelectric component which suppress ripples in the range of oscillation frequency and achieves stabilization of oscillation frequency is provided. A piezoelectric component of the invention includes a support substrate; a piezoelectric element having an elongated shape, comprising excitation electrodes disposed on one principal surface and the other principal surface thereof, respectively, the excitation electrodes facing each other; a first support portion and a second support portion which are disposed between both ends in a longitudinal direction of the piezoelectric element and the support substrate; and an electrically conductive joining material which joins the first support portion and the second support portion to the ends of the piezoelectric element, respectively. A center of the piezoelectric element is offset with respect to an intermediate point between the first support portion and the second support portion as seen in a plan view of the piezoelectric component.