Vibration Element Wiring Simplification via Polarity Reversal
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Solution Overview
Problem
Existing vibration elements face complexity in wiring structures and reduced stability of electrical coupling due to the need for opposite phase vibration between outer and central vibrating arms, which complicates the electrical coupling and affects vibration characteristics.
Innovation Solution
A vibration element design featuring a base with continuous first and second arms, where the first and second piezoelectric layers with different polarities are used, along with an insulating layer, to simplify the wiring structure and achieve opposite phase vibration by applying an electric field, thereby stabilizing the electrical coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If through-hole wiring is used to electrically couple electrodes to achieve opposite phase vibration, then vibration characteristics are improved, but wiring structure becomes complicated and electrical coupling stability is reduced
Solution Approach 1:
The patent merges the electrical coupling function into the base structure itself by forming electrodes directly on the base surface. The base serves as both the structural support and the electrical coupling medium, eliminating the need for separate through-hole wiring structures. This integration simplifies the wiring structure while maintaining stable electrical coupling for achieving opposite phase vibration between outer and central vibrating arms.
2Reliability
If insulating layer thickness above base is increased to reduce load capacitance, then vibration characteristics are improved, but device structure becomes more complex
Solution Approach 1:
The patent applies different insulating layer thicknesses to different regions: a first insulating layer with greater thickness is provided above the base where cross wirings overlap to reduce load capacitance, while a second insulating layer with smaller thickness is provided above the vibrating arms. This local differentiation optimizes vibration characteristics by reducing capacitance only where necessary without unnecessarily complicating the overall structure.
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 simplifies the wiring structure and enhances the stability of electrical coupling, allowing for efficient and stable opposite phase vibration, improving the overall vibration characteristics and reliability of the vibration element.
Implementation Method 1
a first piezoelectric layer that has a first polarity and is disposed on the first electrode on the first arm; a second piezoelectric layer that has a second polarity different from the first polarity and is disposed on the first electrode on the second arm
Data Source
AI summary
A vibration element includes: a base; a first arm continuous with the base; a second arm that is continuous with the base and is adjacent to the first arm; a first electrode disposed on the first arm, the second arm, and the base; a first piezoelectric layer that has a first polarity and that is disposed on the first electrode on the first arm; a second piezoelectric layer that has a second polarity different from the first polarity and that is disposed on the first electrode on the second arm; an insulating layer disposed on the first electrode on the base; and a second electrode disposed on the first piezoelectric layer, the second piezoelectric layer, and the insulating layer.