Dual Piezoelectric Vibrator Audio Structure for Wider Sound Range
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Solution Overview
Problem
Piezoelectric speakers have a narrower sound range compared to electromagnetic speakers, limiting their ability to provide high-quality sound across a wide frequency range while maintaining a compact size.
Innovation Solution
The audio device incorporates a combination of two piezoelectric vibrators with different natural frequencies, where one enhances high-range sound quality and the other improves low-range sound quality, allowing for synchronized operation with a single drive signal to achieve wide-range sound improvement without complicating the control circuit configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a single piezoelectric vibrator is used, then the device achieves downsizing, but the sound range becomes narrower
Solution Approach 1:
The single piezoelectric vibrator is segmented into two separate piezoelectric vibrators with different natural frequencies. The first piezoelectric vibrator (with higher natural frequency) handles high-range sounds, while the second piezoelectric vibrator (with lower natural frequency) handles low-range sounds, thereby expanding the overall sound range while maintaining the compact piezoelectric speaker design
2Adaptability or versatility
If two piezoelectric vibrators with different natural frequencies are used, then sound quality in a wide range is improved, but the device size increases
Solution Approach 1:
Each piezoelectric vibrator is designed with specific local characteristics - the first piezoelectric vibrator has a higher natural frequency optimized for high-range sound production, while the second piezoelectric vibrator has a lower natural frequency optimized for low-range sound production. This local differentiation of vibrator properties enables wide sound range coverage without requiring a proportional increase in overall device volume
Solution Approach 2:
The patent utilizes the frequency dimension by employing piezoelectric vibrators with different natural frequencies rather than simply adding more vibrators of the same type. This dimensional approach to sound range expansion allows two vibrators to be integrated into a compact design by exploiting the frequency spectrum rather than requiring additional spatial dimensions
3Adaptability or versatility
If different drive signals are used for the two piezoelectric vibrators, then sound quality control is improved, but the control circuit configuration becomes complicated
Solution Approach 1:
The control functions for both piezoelectric vibrators are merged into a unified control approach where a single drive signal is used to actuate both vibrators. The natural frequency differences between the two vibrators inherently provide frequency separation, eliminating the need for complex independent control circuits while still achieving wide sound range coverage through synchronized operation
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 enables the audio device to provide improved sound quality across a wide frequency range while achieving downsizing, ensuring both high and low frequencies are effectively covered without increasing the circuit complexity.
Implementation Method 1
a first piezoelectric vibrator and a second piezoelectric vibrator provided on the vibration member
Data Source
AI summary
An audio device includes a vibration member, and a first piezoelectric vibrator and a second piezoelectric vibrator that are provided on the vibration member. A natural frequency of the first piezoelectric vibrator is larger than a natural frequency of the second piezoelectric vibrator.