PTFE Membrane with Optimized Mesh Support for Waterproof Acoustic Performance
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Solution Overview
Problem
Current waterproof sound-transmitting membranes have limitations in water entry pressure characteristics and acoustic performance, necessitating an improvement in both areas while maintaining waterproofness and sound transmissibility.
Innovation Solution
A waterproof sound-transmitting membrane comprising a porous polytetrafluoroethylene (PTFE) membrane with a supporting mesh or net having specific fiber diameters and opening sizes, joined without stretching, enhances water entry pressure and acoustic characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plastic membrane with support is used to provide waterproofness, then waterproofness is improved, but water entry pressure characteristics are insufficient
Solution Approach 1:
The invention uses a composite structure combining a porous PTFE membrane with a specific supporting member (mesh or net with fiber diameter 45-60μm and opening size 700-1100μm). This composite material approach allows the PTFE membrane to provide waterproofness while the supporting member with optimized parameters enhances water entry pressure characteristics, resolving the contradiction between waterproofness and water resistance.
2Ease of manufacture
If the supporting member is stretched to improve workability, then ease of manufacture is improved, but acoustic characteristics deteriorate
Solution Approach 1:
The invention changes the key parameter from stretching the supporting member to optimizing the fiber diameter (45-60μm) and opening size (700-1100μm) of the mesh or net. This parameter optimization approach allows the supporting member to maintain adequate strength and workability without stretching, thereby preserving the acoustic characteristics of the PTFE membrane while ensuring ease of manufacture.
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 provides a membrane with improved water entry pressure and acoustic performance, ensuring both waterproofness and sound transmission efficiency, suitable for use in electronic devices.
Implementation Method 1
a porous membrane containing polytetrafluoroethylene as a main component
Implementation Method 2
waterproof sound-transmitting membrane including: a porous membrane containing polytetrafluoroethylene as a main component
Data Source
AI summary
A waterproof sound-transmitting membrane (1) of the present invention includes a porous membrane (11) containing polytetrafluoroethylene as a main component and a supporting member (12) that supports the porous membrane (11). The supporting member (12) is joined to the porous membrane (11) placed thereon and is not subjected to stretching after the porous membrane (11) is placed thereon. The supporting member (12) is a mesh or a net having a fiber diameter of 45 to 60 μm and an opening size of 700 to 1100 μm across the supporting member (12). The waterproof sound-transmitting membrane (1) has a water entry pressure of 20 kPa or more as measured according to the method B (high hydraulic pressure method) of JIS L 1092.