Piezoelectric Vibration Structure With Elastic Coupling For Impact Protection
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Solution Overview
Problem
Piezoelectric ceramic members in tactile sense presentation devices are prone to damage when subjected to impacts in the thickness direction due to differential displacement of their ends, leading to potential breakage.
Innovation Solution
A vibration structure design featuring a piezoelectric member with ends spaced apart from the vibration portion and connected via elastically deformable coupling members, which absorb and distribute impact forces, reducing the likelihood of damage by ensuring equal displacement of both ends and minimizing stress on the intermediate portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a piezoelectric member is fixed rigidly at both ends to the frame and vibration portion, then the connection strength is improved, but the piezoelectric member is prone to breakage when impact is applied in the thickness direction
Solution Approach 1:
The coupling portions are designed to be elastically deformable, allowing the connection structure to dynamically adapt to impact forces. The elastic deformation capability enables the coupling portions to flexibly absorb impact energy through reversible deformation, preventing stress concentration that would otherwise cause piezoelectric member breakage while maintaining secure connections during normal operation
Solution Approach 2:
The coupling portions are designed with specific geometric parameters (length, width, thickness ratios) that optimize their elastic deformation characteristics. By carefully controlling these parameters, the coupling portions achieve the right balance between connection strength and impact absorption, allowing them to deform elastically under impact while maintaining sufficient rigidity for secure mounting
2Power
If the piezoelectric member is made of piezoelectric ceramic for high performance, then the piezoelectric effect is improved, but the material becomes more susceptible to cracking under impact
Solution Approach 1:
The coupling portions act as intermediary elements between the piezoelectric member and the rigid structures (frame and vibration portion). These elastic intermediaries decouple the rigid constraints from the fragile piezoelectric ceramic, allowing the ceramic to expand and contract freely during normal piezoelectric operation while protecting it from impact-induced cracking through the cushioning effect of the deformable coupling portions
3Reliability
If the piezoelectric member is spaced apart from the vibration portion, then the stress on the piezoelectric member is reduced, but the connection complexity increases
Solution Approach 1:
The coupling portions serve multiple functions simultaneously: they mechanically connect the piezoelectric member to both the frame and vibration portion, provide elastic cushioning against impact forces, and allow for thermal expansion and contraction. This multi-functionality is achieved through a single integrated component design that eliminates the need for separate mounting structures, thereby reducing overall connection complexity while maintaining protective spacing
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 prevents damage to the piezoelectric member during impacts by distributing forces evenly, allowing for repeated deformation without breaking, thus enhancing the durability of the tactile sense presentation device.
Implementation Method 1
each of the first connection member and the second connection member includes an elastically deformable portion having a locally increased ease of elastic deformation in a plane direction and a thickness direction
Implementation Method 2
When a voltage is applied to the piezoelectric film, the piezoelectric film expands and contracts
Data Source
AI summary
A vibration structure that includes: a vibration portion; a piezoelectric member having a first end portion and a second end portion; a frame member that surrounds the vibration portion and the piezoelectric member; a vibration portion support portion that connects the vibration portion and the frame member; a first fixing portion connected to the first end portion; a second fixing portion connected to the second end portion; and first to fourth coupling portions, wherein when a combination of the first coupling portion and the second coupling portion is defined as a first connection member and a combination of the third coupling portion and the fourth coupling portion is defined as a second connection member, each of the first and second connection members includes an elastically deformable portion having a locally increased ease of elastic deformation in a plane direction and a thickness direction.