Acoustic Vent Assembly With Optimized Adhesive Area for Sound
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Solution Overview
Problem
Existing vent assemblies in electronic devices struggle to balance protection from particulates and liquids while maintaining high acoustic performance, as they often compromise sound transmission to ensure durability and resistance to contaminants.
Innovation Solution
A vent assembly with a specific ratio of adhesive layer surface area to active acoustic membrane area, utilizing materials like fluoropolymers and porous or non-porous membranes, which allow controlled gas flow and sound transmission while preventing liquid ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the membrane is made thicker or more substantial to prevent ingress of particulates and liquids, then protection reliability is improved, but acoustic transmission performance deteriorates
Solution Approach 1:
The patent employs a thin film membrane structure that provides liquid and particulate protection while maintaining acoustic transmission. The membrane is designed with optimal thickness and material properties to balance protection reliability and acoustic performance, avoiding the need for thick substantial barriers that would block sound waves.
Solution Approach 2:
The patent optimizes membrane parameters including thickness, porosity, and material composition to achieve the desired balance between protection and acoustic transmission. By adjusting these parameters, the membrane can effectively block liquids and particulates while allowing sound waves to pass through with minimal attenuation.
2Reliability
If the adhesive layer area is increased to ensure adequate sealing and protection, then protection reliability is improved, but acoustic performance deteriorates due to reduced active membrane area
Solution Approach 1:
The patent applies adhesive material selectively in specific locations and quantities to achieve adequate sealing without excessive coverage. The adhesive is concentrated at critical sealing points rather than being uniformly distributed, which maintains the active membrane area for acoustic transmission while ensuring protection reliability at key interfaces.
Solution Approach 2:
The patent uses a controlled amount of adhesive that is sufficient for sealing purposes without excessive coverage. The adhesive layer area ratio is optimized to provide just enough sealing and protection while minimizing the reduction of active membrane area, avoiding both insufficient and excessive adhesive application.
3Object-generated harmful factors
If the membrane porosity is increased to improve sound transmission, then acoustic performance is improved, but resistance to liquid ingress deteriorates
Solution Approach 1:
The patent employs a porous membrane structure with optimized pore size, distribution, and connectivity to achieve both sound transmission and liquid resistance. The porous structure allows acoustic waves to pass through while the pore dimensions and surface properties prevent liquid penetration, creating a selective barrier that benefits from controlled porosity.
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 vent assembly effectively protects electronic devices from contaminants while maintaining efficient acoustic performance by allowing gas diffusion through controlled membrane vibration and minimizing liquid penetration.
Implementation Method 1
an acoustic membrane having a flow resistance of at least 1000 Pa s/m as measured using the method described herein
Implementation Method 2
allowing gas diffusion through controlled membrane vibration
Data Source
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Figure 3
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AI summary
There is described a vent assembly comprising an acoustic membrane and an adhesive layer provided on a first side of the acoustic membrane, the adhesive layer having a surface area, the adhesive layer comprising an adhesive wall and the adhesive wall defining a venting aperture through which an active area of the acoustic membrane is exposed, wherein the ratio of the surface area of the adhesive layer to the surface area of the active area of the acoustic membrane is less than 2.0.