Piezoelectric Speaker Vibration Apparatus Low-Frequency Sound Pressure
Solution Overview
Problem
Piezoelectric speakers face a technical challenge where the sound pressure level of the low-pitched sound band is insufficient due to high stiffness, leading to inadequate sound reproduction.
Innovation Solution
An apparatus comprising a passive vibration member, a supporting member, and a vibration apparatus with first and second active vibration members connected to each other, intersecting with each other, and connected to the passive and supporting members, enhancing the sound pressure level of the low-pitched sound band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If piezoelectric speakers use high stiffness materials, then structural strength is improved, but sound pressure level of low-pitched sound band deteriorates
Solution Approach 1:
The vibration system is divided into multiple independent piezoelectric elements arranged in a specific pattern. This segmentation allows different regions to contribute differently to the overall vibration, enabling enhanced low-frequency sound pressure while maintaining structural strength through the distributed configuration of stiff materials.
Solution Approach 2:
The piezoelectric elements are arranged in an asymmetric pattern rather than a uniform distribution. This asymmetric arrangement creates specific vibration modes that enhance low-frequency sound pressure output while the overall structure maintains sufficient strength through the strategic placement of stiff piezoelectric materials.
2Strength
If piezoelectric speakers use high stiffness materials, then structural strength is improved, but displacement width deteriorates
Solution Approach 1:
By segmenting the vibration system into multiple piezoelectric elements, the patent achieves cumulative displacement effect. Each element contributes to the overall displacement width, and their coordinated vibration produces enhanced low-frequency sound pressure while maintaining structural strength through the distributed stiff material configuration.
Solution Approach 2:
Multiple piezoelectric elements are merged into a unified vibration system where their individual displacements combine to produce enhanced overall displacement width. The asymmetric arrangement ensures that the combined effect maximizes low-frequency sound pressure while the collective structure maintains sufficient strength.
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 effectively enhances the sound pressure level of the low-pitched sound band, improving sound reproduction by maximizing the displacement width of the passive vibration member through a composite vibration model.
Implementation Method 1
Piezoelectric speakers including ferroelectric ceramic or the like are lightweight and have low power consumption
Data Source
AI summary
An apparatus may include a passive vibration member, a supporting member overlapping the passive vibration member, and a vibration apparatus between the passive vibration member and the supporting member and configured to include first and second active vibration members connected to each other and intersecting with each other. The first active vibration member may be connected to a first member of one of the passive vibration member and the supporting member, and the second active vibration member may be connected to a second member of the other of the passive vibration member and the supporting member.