Vibrating Device Metal Plate Insulating Layer Q Value
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Solution Overview
Problem
The existing vibrating devices with glass plates have low Q values and strength, limiting the displacement amount and requiring improvement.
Innovation Solution
A vibrating device is designed with a metal plate, an insulating layer, and second electrodes disposed on the insulating layer, ensuring electrical insulation and enhanced joining strength between the piezoelectric element and the vibrating body, using an adhesive member to secure the electrodes and prevent contact with external conductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a glass plate is used as the vibrating body, then the device structure is simple, but the Q value and strength are low, resulting in poor displacement performance
Solution Approach 1:
The patent applies composite materials by combining a metal plate (vibrating body) with an insulating layer and electrode structures. The metal plate provides high Q value and strength, while the insulating layer ensures electrical insulation, creating a composite structure that resolves the contradiction between structural simplicity and mechanical performance.
2Strength
If a metal plate is used as the vibrating body, then the Q value and strength are improved, but electrical insulation between the metal plate and electrodes becomes problematic
Solution Approach 1:
The patent introduces an insulating layer as an intermediary between the metal plate (vibrating body) and the electrodes. This insulating layer mediates the electrical insulation requirement while allowing the metal plate to provide its mechanical advantages, thus resolving the contradiction between strength improvement and electrical insulation reliability.
3Device complexity
If the second electrodes are disposed directly on the metal plate, then the device structure is simple, but electrical insulation cannot be secured
Solution Approach 1:
The insulating layer serves as a mediator between the second electrodes and the metal plate. By placing the insulating layer on the metal plate surface before disposing the electrodes, the patent achieves electrical insulation while maintaining a relatively simple device structure, resolving the contradiction between structural simplicity and insulation reliability.
4Ease of manufacture
If the vibrating body uses a glass plate, then the device is easy to manufacture, but the displacement amount cannot be improved
Solution Approach 1:
The patent changes the material parameter of the vibrating body from glass to metal, which fundamentally alters the Q value and strength characteristics. This parameter change enables improved displacement performance while the insulating layer and electrode design maintain manufacturing feasibility, resolving the contradiction between manufacturing ease and displacement performance.
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 use of a metal plate with an insulating layer and strategically positioned second electrodes improves the displacement amount and maintains electrical insulation, enhancing the Q value and strength of the vibrating device while preventing unwanted electrical contacts.
Implementation Method 1
a piezoelectric element includes a piezoelectric element body
Data Source
AI summary
A piezoelectric element body has a first principal surface and a second principal surface. A pair of first electrodes is disposed on the first principal surface. The vibrating body includes a metal plate, an insulating layer, and a pair of second electrodes. The metal plate has a third principal surface and a fourth principal surface. The insulating layer is disposed on the third principal surface. The pair of second electrodes is disposed on the insulating layer. The piezoelectric element and the vibrating body are disposed in such a manner that the first principal surface and the third principal surface oppose each other via the insulating layer. The pair of second electrodes physically contacts the respective first electrodes. The second electrodes are exposed from the piezoelectric element and are separated from all of edges of the insulating layer, when viewed from a direction orthogonal to the third principal surface.