Piezoelectric Resonator Side-Surface Electrodes for Vibration Stability
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Solution Overview
Problem
Piezoelectric devices suffer from unwanted vibrations due to charge distribution caused by contour vibrations, leading to deterioration of vibration characteristics, especially when electrically-conductive films are in an electrically-floating state.
Innovation Solution
A resonator component with a rectangular shape made of piezoelectric material, featuring excitation electrodes on principal surfaces and side-surface electrodes extending along the side surfaces, which are electrically coupled to mounting electrodes, reducing charge distribution and unwanted vibrations by covering the side surfaces where excitation electrodes are disposed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an electrically-conductive film is disposed in an area with a distance G from an edge of the excitation electrode to adjust frequency-dip occurrence temperature, then the frequency-dip occurrence temperature can be adjusted, but charge distribution occurs due to contour vibration and unwanted vibration is induced which deteriorates vibration characteristic
Solution Approach 1:
A ground electrode is introduced as an intermediary element between the excitation electrode and the electrically-conductive film. This ground electrode serves as a mediator that provides a reference potential and prevents charge accumulation on the floating conductive film, thereby eliminating unwanted vibrations while preserving the temperature adjustment function.
Solution Approach 2:
The electrical state of the conductive film is changed from electrically-floating to electrically-grounded by introducing the ground electrode. This parameter change in the electrical configuration eliminates charge distribution issues while maintaining the frequency-dip temperature adjustment capability.
2Reliability
If side-surface electrodes are electrically coupled to mounting electrodes to suppress unwanted vibrations, then vibration characteristic stability is improved, but device complexity increases
Solution Approach 1:
The mounting electrodes serve multiple functions: they provide mechanical mounting support and simultaneously function as electrical ground references for the side-surface electrodes. This multi-functionality reduces the need for separate ground electrodes, thereby limiting the increase in device complexity.
Solution Approach 2:
The mounting function and electrical grounding function are merged into a single electrode structure. The mounting electrodes that physically secure the resonator component also serve as the electrical reference potential, combining two functions into one element to minimize structural complexity.
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 solution effectively suppresses unwanted vibrations and maintains the vibration characteristic stability by electrically coupling side-surface electrodes with mounting electrodes, preventing charge migration and distribution.
Implementation Method 1
a resonator element (10) which has a first principal surface (11), a second principal surface (12) having an obverse-reverse relationship with the first principal surface (11), and a first side surface (13) and a second side surface (14)
Data Source
AI summary
A resonator component includes a resonator element which has a rectangular shape having a longitudinal direction set to a first direction and a width direction set to a second direction in a plan view, which is made of a piezoelectric material, and which has a first principal surface, a second principal surface having an obverse-reverse relationship with the first principal surface, and a first side surface and a second side surface which are configured to couple the first principal surface and the second principal surface to each other, and extend in the first direction, a first excitation electrode disposed on the first principal surface, a second excitation electrode disposed on the second principal surface, a first mounting electrode electrically coupled to the first excitation electrode, a second mounting electrode electrically coupled to the second excitation electrode, a first side-surface electrode which extends in the first direction on the first side surface, and is electrically coupled to the first mounting electrode, and a second side-surface electrode which extends in the first direction on the second side surface, and is electrically coupled to the second mounting electrode.