Piezoelectric Loudspeaker Layout for Low-Frequency Sensitivity
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Solution Overview
Problem
Piezoelectric loudspeakers have low sensitivity and poor low-frequency performance due to a small area of the piezoelectric plate, limiting their acoustic performance.
Innovation Solution
A loudspeaker design featuring multiple sound-producing structures, including a first and second sound-producing structure with free and fixed ends, disposed in a bilateral configuration on a support, increasing the effective area of interaction with the diaphragm assembly and enhancing vibration efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only one piezoelectric plate is disposed, then the structure is simple, but the area of the piezoelectric plate is small and sensitivity is low
Solution Approach 1:
The patent divides the single piezoelectric plate into multiple sound-producing structures (first sound-producing structure and second sound-producing structure) with different fixed ends. This segmentation increases the total effective area while maintaining structural organization, resolving the contradiction between simplicity and sensitivity.
Solution Approach 2:
The patent combines multiple sound-producing structures (first and second) into a unified vibration assembly that works together to drive the diaphragm. By merging their vibrational outputs, the system achieves higher sensitivity and acoustic performance while keeping the overall structure integrated and manageable.
2Area of stationary object
If the piezoelectric plate area is small, then the structure is compact, but the low-frequency performance is poor
Solution Approach 1:
The patent extends the sound-producing structures in the first direction (length dimension) rather than only increasing area in the planar dimension. By creating cantilever structures that extend along the first direction with fixed ends at opposite ends of the support, the system achieves longer effective vibrating length which improves low-frequency response while maintaining compact overall area.
3Length of moving object
If the length of the piezoelectric plate is short, then the structure is compact, but the sensitivity is low
Solution Approach 1:
The patent segments the vibration function across multiple sound-producing structures of moderate length, each fixed at opposite ends of the support. This allows each individual structure to maintain reasonable length for compactness while the collective arrangement provides sufficient total effective area and sensitivity.
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 improves sensitivity and acoustic performance by increasing the area of interaction between the vibration assembly and diaphragm assembly, reducing resonance frequency, and enhancing low-frequency sensitivity.
Implementation Method 1
The piezoelectric plate vibrates under a drive voltage to drive the diaphragm to vibrate
Data Source
AI summary
The present disclosure belongs to the field of loudspeakers and discloses a loudspeaker and an electronic device. The loudspeaker includes a support, a diaphragm assembly, and a vibration assembly; where a cavity extending through the upper surface and the lower surface of the support is formed on the support; the vibration assembly is disposed on a side, facing the vibration assembly, of the diaphragm assembly and is capable of driving the diaphragm assembly to vibrate in a third direction; the vibration assembly includes multiple sound-producing structures, and the multiple sound-producing structures are disposed in the same layer on the support.