Piezoelectric Transducer Pillar Structure for Sound Pressure
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Solution Overview
Problem
Piezoelectric speakers suffer from low sound pressure levels and distortion due to energy wastage and mechanical resonance caused by the bonding material and frame structure, leading to uneven sound pressure and ripple phenomena.
Innovation Solution
A piezoelectric electroacoustic transducer with a three-dimensional structure featuring a top portion and side portion integrally connected by press molding, where the side portion is separated into pillars with gaps, and a membrane covers the gaps, reducing resonance and enhancing energy transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the membrane is fixed on the frame by bonding material, then the structure is stable, but vibration energy is wasted and converted into thermal energy causing lower sound pressure level
Solution Approach 1:
The patent removes the bonding material from between the membrane and frame, extracting the harmful element that caused energy loss. The membrane is directly coupled to the piezoelectric element without intermediate bonding layers, eliminating the energy dissipation path while maintaining structural integrity through direct mechanical coupling.
Solution Approach 2:
The patent merges the membrane assembly with the piezoelectric element by direct coupling, eliminating separate bonding components. The membrane is directly attached to the piezoelectric element's vibration surface, creating an integrated structure that reduces energy loss at interfaces while maintaining structural stability through unified design.
2Manufacturing precision
If the membrane is fixed on the frame, then the structure is stable, but mechanical resonance occurs causing uneven sound pressure level and distortion
Solution Approach 1:
The patent extracts the frame structure that caused mechanical resonance and removes the bonding material that transmitted resonant vibrations to the membrane. By eliminating these rigid supporting structures, the system avoids mechanical resonance frequencies that would cause distortion and uneven sound pressure distribution.
Solution Approach 2:
The patent changes the mechanical parameters of the system by removing rigid frame structures and bonding materials, fundamentally altering the resonance characteristics. This parameter change eliminates the mechanical resonance pathway that caused distortion, allowing for more uniform sound pressure level across the frequency spectrum.
3Productivity
If various physical or chemical assembling manners are used to connect piezoelectric element, bonding material and frame, then the structure is complete, but the structure becomes complicated and energy transition efficiency is reduced
Solution Approach 1:
The patent extracts and removes the bonding material and frame structures from the assembly, simplifying the overall structure. This extraction eliminates multiple assembly steps and material interfaces, reducing structural complexity while improving energy transition efficiency by removing energy loss pathways at each interface.
Solution Approach 2:
The patent merges the piezoelectric element directly with the membrane, eliminating intermediate bonding materials and frame structures. This consolidation reduces the number of components and assembly steps, simplifying the structure while improving energy transition efficiency by creating direct mechanical coupling with minimal energy loss.
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 achieves high sound pressure levels, flat sound pressure curvature, and low total harmonic distortion, while also functioning as a microphone for efficient sound wave conversion to electronic signals.
Implementation Method 1
a piezoelectric element deforms and drives a membrane closed attached thereto to vibrate so as to compress air for producing sounds
Implementation Method 2
the piezoelectric electroacoustic transducer may exhibit a speaker characteristic for high sound pressure level... as well as a microphone function for converting sound wave to electronic signal
Data Source
AI summary
A piezoelectric electroacoustic transducer is provided, including a three-dimensional structure, at least a piezoelectric element, and at least a membrane. The three-dimensional structure is formed to have a top portion and a side portion integrally connected to the top portion by press molding a plate. The side portion has at least a gap and is separated into a plurality of pillars by the at least a gap. The at least a piezoelectric element is disposed on the top portion, and the at least a membrane covers the at least a gap of the side portion. The piezoelectric electroacoustic transducer in the present disclosure is capable of being implemented as a loudspeaker or a microphone.