Piezoelectric Vibration Apparatus with Damping Layer for Low-Frequency Sound
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Piezoelectric-type vibration apparatuses are prone to damage from external impacts and have lower sound characteristics and sound pressure levels, especially in low-pitched sound bands due to their fragile nature and low piezoelectric constant.
Innovation Solution
A vibration apparatus comprising a vibration member connected to multiple overlapping vibration generating portions, each with different material layers, which enhance sound and sound pressure level characteristics by maximizing amplitude displacement and resonance frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If piezoelectric-type vibration apparatuses are used, then the apparatus can generate vibration and sound, but the reliability is low due to fragile characteristic and susceptibility to external impact
Solution Approach 1:
The patent introduces a damping layer between the piezoelectric device and the vibration member to cushion external impacts before they reach the fragile piezoelectric component. This damping layer absorbs and dissipates impact energy, protecting the piezoelectric device from damage while maintaining the apparatus's vibration generation capability.
2Power
If piezoelectric-type vibration apparatuses are used, then the apparatus can generate sound, but the sound characteristic and sound pressure level are lower in low-pitched sound band region
Solution Approach 1:
The patent employs a composite structure consisting of multiple layers including a piezoelectric device layer, a damping layer, and a vibration member layer. This composite structure combines the advantages of each material: the piezoelectric layer provides efficient vibration generation, the damping layer enhances low-frequency response and protects against impact, and the vibration member amplifies the overall sound output, particularly in low-pitched regions.
Solution Approach 2:
The patent optimizes the thickness and material properties of each layer in the composite structure to enhance low-frequency sound characteristics. By adjusting parameters such as the thickness of the damping layer and the mechanical properties of the vibration member, the apparatus achieves improved sound pressure level and sound quality in the low-pitched sound band region.
3Power
If multiple overlapping vibration generating portions are used, then the sound characteristic and sound pressure level are enhanced, but the device complexity increases
Solution Approach 1:
The patent integrates multiple vibration generating portions into a single composite structure where the piezoelectric device, damping layer, and vibration member work together as one unified system. This merging approach achieves enhanced sound pressure level and sound characteristics without proportionally increasing device complexity, as the layers are bonded together and function in coordination.
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 solution significantly improves sound quality and sound pressure levels across all frequency bands, particularly in low-pitched regions, by optimizing the vibration structure and material distribution within the apparatus.
Implementation Method 1
piezoelectric-type using a piezoelectric device to output a sound
Implementation Method 2
vibrate a vibration member to generate a vibration or a sound
Data Source
AI summary
An apparatus may enhance a sound characteristic and/or a sound pressure level characteristic. An apparatus includes a vibration member, a vibration apparatus under the vibration member, a plurality of vibration portions overlapping one another, and a connection member connecting at least a portion of the plurality of vibration portions to the vibration member.