Piezoelectric Speaker Structure With Segmented Vibration for Higher SPL
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Solution Overview
Problem
Piezoelectric speakers have limited vibration width, leading to insufficient sound pressure levels.
Innovation Solution
A sound apparatus comprising first and second vibration devices, substrates, and elastic members connected to a vibration member, enhancing sound quality through coordinated vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If piezoelectric devices are used for speakers, then weight is reduced and power consumption is lowered, but vibration width is limited and sound pressure level is insufficient
Solution Approach 1:
The speaker system is divided into multiple piezoelectric vibration devices (first, second, third, and fourth vibration devices) arranged in a segmented pattern around the central axis. Each vibration device independently contributes to the overall sound pressure, allowing the system to achieve high sound pressure levels while maintaining the lightweight advantage of individual piezoelectric elements.
Solution Approach 2:
Multiple piezoelectric vibration devices are merged into a single integrated speaker system with a common diaphragm. The combined vibration output of all piezoelectric devices acts together to produce enhanced sound pressure levels, resolving the limitation of individual piezoelectric elements while preserving their lightweight characteristics.
2Stress or pressure
If vibration width is increased to improve sound pressure level, then sound quality is enhanced, but device damage from high sound pressures may occur
Solution Approach 1:
The vibration output is segmented across multiple piezoelectric devices rather than concentrating high stress on a single element. This distribution allows the system to achieve high overall sound pressure while each individual piezoelectric device operates within safe stress limits, preventing device damage.
Solution Approach 2:
Different regions of the speaker system have specialized functions: piezoelectric devices generate vibration, substrates provide structural support and vibration transmission, and the diaphragm converts vibration to sound waves. This local specialization allows optimized performance in each region while maintaining overall reliability.
3Stress or pressure
If multiple vibration devices are added to increase sound pressure, then sound pressure level is improved, but device complexity increases
Solution Approach 1:
Multiple piezoelectric vibration devices are merged into a unified structure sharing common components including the diaphragm, suspension elements, and magnetic circuit. This merging approach increases sound pressure level while minimizing the increase in overall device complexity through component sharing and integration.
Solution Approach 2:
The speaker system employs an asymmetric arrangement with vibration devices positioned at specific locations (including off-axis positions) rather than symmetric distribution. This asymmetric configuration optimizes vibration transmission paths and sound pressure distribution while simplifying the overall structural design compared to fully symmetric multi-element arrangements.
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 apparatus improves sound quality by increasing vibration displacement and sound pressure levels.
Implementation Method 1
a first vibration device which vibrates by an input driving signal... a second vibration device which vibrates by an input driving signal
Data Source
AI summary
A sound apparatus comprises a first vibration device which vibrates by an input driving signal, a first substrate including a first main surface and a second main surface facing each other, wherein the first vibration device is disposed on at least a portion of the first main surface of the first substrate, a second substrate including a first main surface and a second main surface facing each other, wherein a portion of the first main surface of the second substrate is disposed to be adjacent to a portion of the second main surface of the first substrate, a second vibration device disposed on at least a portion of the second main surface of the second substrate and vibrates by the input driving signal, a vibration member, a first elastic member connecting the first substrate and the vibration member, and a second elastic member connecting the first substrate and the vibration member.