Piezoelectric Resonator Support Structure for Vibration Leakage Control
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Solution Overview
Problem
Existing piezoelectric resonator devices suffer from vibration leakage, which deteriorates vibration characteristics due to the extension of the coupling part along the direction of thickness-shear vibration, leading to increased spurious vibrations.
Innovation Solution
A resonator device design featuring a resonator element with a vibrating part, a coupling arm extending in a direction perpendicular to the thickness-shear vibration, and a support part with a bonding member that includes electrically-conductive adhesives to bond the resonator element and container, preventing vibration leakage and enhancing mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the coupling part extends from the vibrating part along the X axis (thickness-shear vibration direction), then the structural connection between vibrating part and support part is achieved, but vibration leakage increases and vibration characteristics deteriorate
Solution Approach 1:
The coupling arm is extended in the Z axis direction (perpendicular to the thickness-shear vibration direction) rather than along the X axis, changing the dimensional orientation of the coupling structure. This dimensional change allows the coupling arm to provide structural connection while avoiding the vibration leakage path along the thickness-shear direction, thus resolving the contradiction between structural connection and vibration characteristics
Solution Approach 2:
The support part is divided into a first support arm extending in the X axis direction and a second support arm extending in the Z axis direction. This segmentation allows the first support arm to provide structural connection while the second support arm extends perpendicular to the vibration direction to minimize vibration leakage, achieving both structural integrity and vibration characteristic stability
2Ease of manufacture
If the coupling part extends along the thickness-shear vibration direction, then the bonding between resonator element and container is facilitated, but spurious vibrations increase
Solution Approach 1:
The coupling arm extends in the Z axis direction (perpendicular to the thickness-shear vibration direction) for the portion that bonds to the container, changing the bonding interface orientation. This dimensional change facilitates bonding while avoiding the generation of spurious vibrations along the vibration direction, resolving the contradiction between ease of manufacture and reduction of harmful vibrations
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
The design effectively reduces vibration leakage and spurious vibrations, stabilizing the vibration characteristics and mechanical strength of the resonator device.
Implementation Method 1
a vibrating part which has a first principal surface provided with a first excitation electrode, a second principal surface provided with a second excitation electrode and having an obverse-reverse relationship with the first principal surface... thickness-shear vibration excited by the first excitation electrode and the second excitation electrode
Implementation Method 2
a bonding member configured to bond the resonator element and the container to each other
Data Source
AI summary
A resonator device includes a resonator element, a container configured to house the resonator element, and a bonding member configured to bond the resonator element and the container to each other, wherein the resonator element has a vibrating part which has a first principal surface provided with a first excitation electrode, a second principal surface provided with a second excitation electrode and having an obverse-reverse relationship with the first principal surface, and a side surface extending in a first direction along a displacement direction of a thickness-shear vibration excited by the first excitation electrode and the second excitation electrode, and which has a longitudinal direction in a second direction as a direction crossing the first direction, a coupling arm extending in the second direction from the side surface of the vibrating part, and a support part which includes a first support arm extending in the first direction from the coupling arm, which extends in the first direction, and which is bonded to the container via the bonding member.