Piezoelectric Buzzer Front Cover Helmholtz Resonator High Frequency
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Solution Overview
Problem
Conventional sound generating apparatuses, such as moving-coil receivers, face challenges in achieving high-frequency cut-off frequencies above 16 kHz due to material and production process limitations, particularly in meeting the requirements for ultra-wide frequency bands with 4G communications.
Innovation Solution
Incorporating a piezoelectric buzzer and a front cover that form a Helmholtz resonator, where the piezoelectric buzzer is attached to the front cover, and the resonant frequency of the Helmholtz resonator is optimized to enhance high-frequency performance by compensating for the sound generating member's frequency response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a moving-coil receiver is used as the sound generating apparatus, then the structure is simple and manufacturing is easy, but the high-frequency cut-off frequency cannot exceed 9 kHz due to material and production process limitations
Solution Approach 1:
The sound generating apparatus is divided into two independent sound generating members: a moving-coil receiver for low-frequency sound generation and a piezoelectric buzzer for high-frequency sound generation. Each member operates in its optimal frequency range, with the piezoelectric buzzer specifically targeting frequencies above 9 kHz to extend the overall frequency response beyond the limitations of the moving-coil receiver alone.
Solution Approach 2:
The invention combines two different transducer technologies (moving-coil and piezoelectric) into a single hybrid sound generating apparatus. The piezoelectric buzzer uses piezoelectric ceramic materials that can generate high-frequency vibrations, while the moving-coil receiver handles lower frequencies, creating a composite system that overcomes the material limitations of either technology used alone.
2Device complexity
If conventional sound generating apparatus designs are used, then the device complexity is low, but the high-frequency cut-off frequency cannot reach above 16 kHz required for ultra-wide frequency band with 4G communications
Solution Approach 1:
The frequency range is segmented into two bands: low-frequency (handled by moving-coil receiver) and high-frequency (handled by piezoelectric buzzer). This segmentation allows each component to be optimized for its specific frequency range, enabling the system to achieve ultra-wide frequency band coverage including frequencies above 16 kHz without requiring complete redesign of the entire sound generating apparatus.
Solution Approach 2:
The sound generating apparatus is designed to perform multiple functions: the moving-coil receiver provides bass and mid-range frequencies, while the piezoelectric buzzer specifically enhances high-frequency response above 9 kHz. This multi-functional design enables a single apparatus to meet the ultra-wide frequency band requirements for 4G communications while maintaining relatively simple device structure.
3Manufacturing precision
If the piezoelectric buzzer is attached to the front cover to form a Helmholtz resonator, then the high-frequency performance is enhanced and cutoff frequency increases to 20 kHz or 40 kHz, but the device structure becomes more complex
Solution Approach 1:
The piezoelectric buzzer utilizes mechanical vibration of piezoelectric ceramic elements to generate high-frequency sound waves. When attached to the front cover, it creates a Helmholtz resonator system that resonates at specific high frequencies, extending the frequency response to 20 kHz or 40 kHz. The mechanical vibration principle allows efficient high-frequency sound generation without requiring complex electronic circuitry.
Solution Approach 2:
The Helmholtz resonator configuration utilizes air pressure and fluid dynamics within the front cover cavity. The piezoelectric buzzer drives air molecules to oscillate, creating resonant pressure waves that amplify high-frequency sound output. This pneumatic resonance mechanism enhances high-frequency performance while maintaining a relatively simple structural implementation compared to alternative acoustic designs.
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 effectively increases the high-frequency cutoff frequency of the sound generating apparatus, improving its high-frequency performance to reach up to 20 kHz or 40 kHz, thereby addressing the limitations of traditional designs.
Implementation Method 1
a piezoelectric buzzer... converting an electric signal into a sound signal
Implementation Method 2
a moving-coil receiver... converting an electric signal into a sound signal
Implementation Method 3
the piezoelectric buzzer and the front cover form a Helmholtz resonator
Data Source
AI summary
The present invention discloses a sound generating apparatus, an electrode device and a method for manufacturing the same. The sound generating apparatus includes a sound generating member, a piezoelectric buzzer and a front cover, wherein the front cover is attached to the front of the sound generating member, and the piezoelectric buzzer is attached to the front cover.