Composite Diaphragm Damping via Layered Ethylene-Acrylate Rubber
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Solution Overview
Problem
Rubber diaphragms in sound-generating devices face challenges with low damping and high distortion, particularly in miniaturized devices where high sound quality requirements are not met.
Innovation Solution
A composite diaphragm is developed, comprising an adhesive layer and at least two rubber layers, where each rubber layer is prepared by high-temperature crosslinking of ethylene-acrylate rubber with a vulcanizing agent, nano filler, anti-aging agent, and internal releasing agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rubber diaphragm is used in sound-generating devices, then good pure sound and high loudness are achieved, but damping is low and distortion is high
Solution Approach 1:
The patent uses a composite diaphragm structure consisting of multiple rubber layers (at least two) bonded together with adhesive layers. Each rubber layer contains specific formulations with ethylene-acrylate rubber, nano fillers, vulcanizing agents, anti-aging agents, and internal releasing agents. This composite structure combines the advantages of rubber materials while mitigating their individual shortcomings, achieving both good sound quality and improved damping properties.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the rubber material through high-temperature crosslinking (100-200°C for 5-30 minutes) and precise formulation control. By adjusting the crosslinking degree, filler content (0-100 parts by weight), and other compositional parameters, the diaphragm achieves optimized damping characteristics while maintaining good sound quality and high loudness.
2Reliability
If rubber diaphragm is used in sound-generating devices, then good pure sound and high loudness are achieved, but distortion is high
Solution Approach 1:
The composite diaphragm structure with multiple rubber layers and adhesive layers creates a more complex vibration pattern that reduces distortion. The combination of different rubber formulations and the bonded layer structure helps to cancel out harmful vibrations and harmonics, thereby reducing total harmonic distortion while maintaining good pure sound and high loudness.
Solution Approach 2:
Through high-temperature crosslinking and precise control of material composition (vulcanizing agent content of 1-8 parts by weight, anti-aging agent of 0.2-6 parts by weight), the patent optimizes the mechanical properties of the rubber diaphragm. This results in reduced distortion while preserving the good sound quality and high loudness characteristics of rubber materials.
3Volume of moving object
If miniaturization of sound-generating devices is pursued, then device size is reduced, but high sound quality requirements cannot be met
Solution Approach 1:
The patent uses high-temperature crosslinking (100-200°C) to significantly improve the mechanical properties and damping characteristics of the rubber diaphragm. This allows the diaphragm to maintain high sound quality in miniaturized devices where space is constrained and traditional rubber materials would fail to meet performance requirements.
Solution Approach 2:
The composite structure with multiple rubber layers and adhesive layers provides enhanced performance in a compact form factor. The layered construction allows for optimized acoustic properties while maintaining a small overall size, enabling miniaturized sound-generating devices to meet high sound quality requirements.
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 composite diaphragm significantly improves damping properties and reduces total harmonic distortion, enhancing acoustic performance and restoring better acoustic effects in sound-generating devices.
Implementation Method 1
each of the at least two rubber layers is prepared by high-temperature crosslinking of a rubber material and a vulcanizing agent
Implementation Method 2
adjacent two layers of the at least two rubber layers are stacked, and bound and fixed through the adhesive layer
Implementation Method 3
the loss factor peak of the composite diaphragm in the dynamic mechanical analysis (DMA) is widened, and the loss factor is maintained at a higher level within a range from −10° C. to high temperature, such that the damping property of the diaphragm is greatly improved
Data Source
AI summary
A composite diaphragm, including an adhesive layer and at least two rubber layers stacked and bound through the adhesive layer. The rubber layer is prepared by crosslinking of a rubber material and a vulcanizing agent, and includes, by weight, 100 parts of ethylene-acrylate rubber, 0-100 parts of nano filler, 1-8 parts of the vulcanizing agent, 0.2-6 parts of an anti-aging agent and 1-10 parts of an internal releasing agent. A sound-generating device including the diaphragm is provided. Through the multi-layer composite structure, the loss factor peak of the composite diaphragm in the dynamic mechanical analysis is widened, and the loss factor is maintained at a higher level within a range from −10° C. to high temperature, greatly improving the damping property. The use of the composite diaphragm in sound-generating devices can effectively improve the acoustic performance and reduce the total harmonic distortion, enabling better acoustic restoration effects.