Piezoelectric Vibration Plate Coupling Optimization
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Solution Overview
Problem
Existing piezoelectric vibration plates and sound generating components face challenges in achieving favorable acoustic conversion efficiency due to insufficient displacement and vibration inhibition caused by coupling portions and damper materials.
Innovation Solution
A piezoelectric vibration plate with a base that includes a central portion for bending vibration, a circumferential portion, penetration portions, and coupling portions. The coupling portions are arranged at the farthest position from the center to maximize displacement, and the penetration portions have a slit shape with a slit width of 0.1 mm or smaller to minimize air convection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If coupling portions are formed on relatively close positions to the center of vibration, then the structure is simpler, but the vibration plate cannot be sufficiently displaced, making it impossible to obtain favorable acoustic conversion efficiency
Solution Approach 1:
The coupling portions are positioned at the farthest position from the center at which maximum displacement is generated, optimizing their location based on vibration dynamics. This dynamic positioning allows the coupling portions to effectively transmit vibration while minimizing their inhibitory effect on displacement, thereby resolving the contradiction between structural simplicity and acoustic conversion efficiency.
2Reliability
If damper material is loaded between the vibration plate portion and the frame body, then frequency characteristics are flattened and distortion components are reduced, but displacement of the vibration plate portion is lessened, degrading acoustic conversion efficiency
Solution Approach 1:
The patent extracts the damping function from a separate damper material and integrates it into the base structure itself. The base is designed with a circumferential portion that provides inherent damping through its structural configuration, eliminating the need for additional damper materials that would restrict vibration plate displacement while maintaining frequency characteristic stability.
Solution Approach 2:
The damping function is merged with the base structure by designing the circumferential portion to provide both structural support and damping characteristics. This integration allows the base to simultaneously fulfill multiple functions without requiring separate damping components that would interfere with vibration plate displacement.
3Object-generated harmful factors
If penetration portions with smaller slit width are used, then air convection is minimized, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a quantitative parameter range for the slit width (0.01 mm to 0.1 mm) that balances air convection suppression with manufacturing feasibility. This parameter optimization resolves the contradiction by identifying a specific range that achieves sufficient air convection reduction while remaining within practical manufacturing precision capabilities.
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 configuration enhances the durability and acoustic conversion efficiency of the piezoelectric vibration plate by improving displacement properties and reducing the inhibitory effects of air convection and coupling vibrations.
Implementation Method 1
a piezoelectric portion (150) that is provided on the central portion (110). The central portion (110) performs bending vibration in a manner to reciprocate between both sides in a thickness direction of the base portion (100) when a voltage is applied to the piezoelectric portion (150)
Data Source
AI summary
A piezoelectric vibration plate includes a base that includes a central portion and a circumferential portion and has conductivity. A piezoelectric portion is provided on the central portion that performs bending vibration in a manner to reciprocate between both sides in a thickness direction of the base when a voltage is applied to the piezoelectric portion. The base includes at least one penetration portion positioned between the central portion and the circumferential portion, and at least one coupling portion that couples the central portion to the circumferential portion. The at least one coupling portion is arranged on a farthest position from a center, at which maximum displacement is generated in the bending vibration, of the central portion.