Piezoelectric Element Protrusions for Acoustic Generator Sound Quality
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Solution Overview
Problem
Conventional acoustic generators using piezoelectric speakers face challenges in achieving uniform sound pressure distribution and reducing frequency variation, leading to suboptimal sound quality, especially in electronic devices like mobile phones and thin televisions.
Innovation Solution
The acoustic generator incorporates a vibrating body with a piezoelectric vibrating element featuring protrusions or recesses on its surface, which alters the vibration energy transfer ratio and resonance frequency, thereby smoothing sound pressure peaks and dips across a wide frequency range, improving sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a piezoelectric vibrating element is used to vibrate the vibrating body, then the acoustic generator can be made small and thin, but the sound pressure distribution becomes non-uniform and frequency variation increases
Solution Approach 1:
The patent applies local quality by providing protrusions or recesses at specific locations on the surface of the piezoelectric vibrating element. These localized structural modifications change the vibration characteristics only in specific areas, allowing uniform sound pressure distribution to be achieved without increasing the overall size of the acoustic generator. The protrusions/recesses are strategically positioned to control the vibration mode and energy distribution.
Solution Approach 2:
The patent changes the physical parameters of the piezoelectric vibrating element by adding protrusions or recesses, which modify the mass distribution, stiffness, and vibration modes. These parameter changes alter the resonance characteristics and energy transfer to the vibrating body, resulting in improved sound pressure uniformity while maintaining the compact form factor.
2Volume of moving object
If a piezoelectric vibrating element is used to vibrate the vibrating body, then the acoustic generator can be made small and thin, but the frequency variation increases leading to suboptimal sound quality
Solution Approach 1:
By introducing localized protrusions or recesses on the piezoelectric vibrating element, the patent modifies the vibration characteristics in specific regions. This local modification helps control the resonance frequencies and reduces frequency variation, thereby improving sound quality consistency without compromising the compact design.
Solution Approach 2:
The patent utilizes mechanical vibration principles by designing the protrusions or recesses to specific dimensions and positions that control the vibration modes of the piezoelectric element. This mechanical design approach optimizes the resonance characteristics and frequency stability, ensuring consistent sound quality across different operating conditions.
3Manufacturing precision
If protrusions or recesses are added to the piezoelectric vibrating element, then sound pressure peaks and dips are smoothed, but the device complexity increases
Solution Approach 1:
The patent implements local quality by adding only small protrusions or recesses at specific locations on the piezoelectric vibrating element, rather than modifying the entire structure. This localized approach achieves smooth sound pressure distribution while minimizing the increase in device complexity. The protrusions/recesses are simple geometric features that can be integrated into the existing manufacturing process.
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 sound quality by dispersing resonance frequencies and reducing frequency variation, resulting in a more consistent and improved audio output across both high and low pitches.
Implementation Method 1
an acoustic generator including a vibrating body and a piezoelectric vibrating element provided in the vibrating body... to vibrate the vibrating body by the piezoelectric vibrating element
Implementation Method 2
to generate a sound using a resonance phenomenon of the vibrating body
Data Source
AI summary
An acoustic generator according to an embodiment includes a vibrating body and an exciter. The exciter is provided on the vibrating body, and vibrates by an input of an electrical signal. The exciter includes a protrusion or a recess on/in a surface of a side of the vibrating body.