Quartz Vibrating Element Electrode Layout for Lower Wiring Resistance
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Solution Overview
Problem
Existing piezoelectric devices face issues with increased electrical resistance and degraded electrical characteristics due to the separation of extended electrodes, leading to potential differences that cause unnecessary vibrations.
Innovation Solution
A quartz vibrating element design with a quartz substrate featuring a vibrating portion, holding portion, and support arm, where extended electrodes are strategically positioned on multiple surfaces of the substrate to increase cross-sectional area and reduce wiring resistance, thereby suppressing parasitic capacitance and unnecessary vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If extended electrodes are sufficiently separated to prevent unnecessary vibrations, then vibration suppression is improved, but wiring width decreases and electrical resistance increases
Solution Approach 1:
The extended electrodes are configured to extend not only in the planar direction but also in the thickness direction of the quartz substrate. This three-dimensional electrode arrangement increases the effective cross-sectional area for current flow, thereby reducing electrical resistance while maintaining sufficient separation distance to prevent parasitic vibrations.
Solution Approach 2:
The patent employs a composite electrode structure where the extended electrodes are formed as continuous conductive paths that integrate multiple surfaces of the quartz substrate. This composite configuration optimizes both the electrical conductivity and mechanical vibration characteristics by distributing the electrode function across different spatial dimensions.
2Object-affected harmful factors
If extended electrodes are sufficiently separated to prevent unnecessary vibrations, then vibration suppression is improved, but wiring width becomes small and electrical resistance increases
Solution Approach 1:
The extended electrodes utilize the thickness dimension of the quartz substrate to increase their effective cross-sectional area. By extending from the front surface through the thickness to the back surface, the electrodes achieve greater wiring width equivalent without increasing the planar footprint, thus maintaining separation while improving electrical conductivity.
3Object-affected harmful factors
If extended electrodes are sufficiently separated to prevent unnecessary vibrations, then vibration suppression is improved, but electrical resistance increases
Solution Approach 1:
The extended electrodes are designed to extend in the thickness direction of the quartz substrate, creating a three-dimensional conductive path. This increases the effective cross-sectional area for current flow, thereby reducing electrical resistance and energy loss while maintaining the separation distance needed to prevent parasitic vibrations.
Solution Approach 2:
The electrode structure forms a composite conductive path that integrates multiple surfaces and dimensions of the quartz substrate. This composite configuration reduces electrical resistance by providing multiple parallel current paths while maintaining the spatial separation necessary to prevent unwanted 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 suppresses the degradation of electrical characteristics by reducing wiring resistance and parasitic capacitance, maintaining high Q-value and low crystal impedance, thus enhancing the performance of quartz vibrators.
Implementation Method 1
a first excitation electrode on a first surface of the vibrating portion; a second excitation electrode on a second surface of the vibrating portion
Implementation Method 2
a first extended electrode on the support arm, and electrically connected to the first excitation electrode, the first extended electrode extending over the first main surface, the first side surface, and the second main surface of the quartz substrate; and a second extended electrode on the support arm and electrically connected to the second excitation electrode
Data Source
AI summary
A quartz vibrating element that includes: a quartz substrate having: a vibrating portion; a holding portion; and a support arm that connects the vibrating portion and the holding portion; first and second excitation electrodes on first and second surfaces of the vibrating portion, respectively; first and second extended electrodes on the support arm, and electrically connected to the first and second excitation electrodes, respectively, the first extended electrode extending over a first main surface, a first side surface, and a second main surface of the quartz substrate, and the second extended electrode extending over the first main surface, a second side surface, and the second main surface of the quartz substrate.