Piezoelectric Vibrator Structure for Spurious Vibration Isolation
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Solution Overview
Problem
Existing piezoelectric vibrator elements fail to effectively isolate spurious vibrations, which degrade the vibration characteristics of the main thickness-shear vibration, due to lack of consideration for the width of the coupling portion.
Innovation Solution
A vibrator element with a rectangular vibrating section and a coupling arm extending from its corner, where the supporting arm is electrically coupled to the excitation electrode and bonded to a container via an adhesive member, with the coupling arm's width being four or more times the thickness of the excitation portion, and its length equal to or smaller than the distance to the supporting electrode, to suppress spurious vibrations and reduce supporting stress influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the coupling portion width is not sufficiently large, then the supporting stress influence is reduced, but the spurious vibration isolation is insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing the width-to-thickness ratio of the coupling arm to 4:1 or greater. This specific dimensional parameter change enables the coupling arm to effectively isolate spurious vibrations while maintaining sufficient supporting strength, resolving the contradiction between vibration isolation and structural strength.
2Object-affected harmful factors
If the coupling portion is made wider to isolate spurious vibration, then the supporting strength may be compromised
Solution Approach 1:
The patent resolves this contradiction by establishing a specific geometric parameter relationship where the coupling arm width along the second direction is four or more times the thickness of the excitation portion. This parameter optimization ensures both effective spurious vibration isolation and adequate supporting strength without compromise.
3Object-affected harmful factors
If the coupling arm length is increased to improve vibration isolation, then the supporting stress influence increases
Solution Approach 1:
The patent applies parameter changes by constraining the coupling arm length along the first direction to be equal to or smaller than the distance from the end part of the supporting arm to the supporting electrode. This length parameter optimization achieves effective vibration isolation while minimizing supporting stress influence.
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 configuration reduces the spurious Q value to 10,000 or less, thereby minimizing the degradation of main vibration characteristics and the influence of supporting stress, while maintaining sufficient supporting strength.
Implementation Method 1
an excitation portion sandwiched by a first excitation electrode provided on the first principal surface and a second excitation electrode provided on the second principal surface and making a thickness-shear vibration
Implementation Method 2
a first supporting electrode electrically coupled to the first excitation electrode and bonded to a container via an adhesive member
Data Source
AI summary
A vibrator element includes a vibrating section having a rectangular shape in a plan view and including a first principal surface, a second principal surface, and an excitation portion sandwiched by a first excitation electrode and a second excitation electrode and making a thickness-shear vibration, a coupling arm extending from a corner part of the vibrating section in a first direction, and a supporting arm having a side surface at one end part side coupled to the coupling arm and extending in a second direction crossing the first direction, wherein the supporting arm includes a first supporting electrode electrically coupled to the first excitation electrode and bonded to a container via an adhesive member, and a width of the coupling arm along the second direction is four or more times a thickness of the excitation portion along a third direction crossing the first direction and the second direction and equal to or smaller than a length from an end part of the supporting arm at the coupling arm side to the first supporting electrode along the second direction.