Multilayer Textile Structure for Acoustic Device Protection
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Solution Overview
Problem
Existing solutions for protecting electronic acoustic components, such as microphones and loudspeakers, from liquid and particle intrusion while maintaining minimal acoustic attenuation are inadequate, often requiring multiple layers that increase airflow resistance and acoustical impedance.
Innovation Solution
A method of laminating two synthetic monofilament precision fabric layers using a novel spraying method to achieve a diffuse joining with optimal adhesion and even airflow resistance, ensuring protection against liquids and particles while preserving acoustic transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple layers are used to protect against liquid and particle intrusion, then protection level is improved, but airflow resistance and acoustical impedance increase
Solution Approach 1:
The patent employs porous polymeric foam material with controlled cell structure that allows acoustic waves to pass through while blocking liquid and particle intrusion. The porous structure provides protection without significantly increasing airflow resistance, resolving the contradiction between protection level and acoustic transparency.
Solution Approach 2:
The invention uses a composite structure combining different materials with complementary properties: a hydrophobic membrane layer for liquid protection, porous polymeric foam for acoustic transparency and particle blocking, and optional adhesive layers. This composite approach achieves high protection levels while maintaining minimal acoustic attenuation.
2Reliability
If multiple layers are used to protect against liquid and particle intrusion, then protection level is improved, but acoustical impedance increases
Solution Approach 1:
The porous polymeric foam with controlled porosity allows acoustic waves to propagate through the protective layer with minimal impedance mismatch. The pore size and distribution are optimized to maintain acoustic transparency while providing effective protection against liquid and particle intrusion.
Solution Approach 2:
The protective structure employs local quality variations with different layers serving specific functions: the hydrophobic membrane provides liquid protection where needed, while the porous foam provides acoustic transparency in the acoustic path. This localized functionality achieves high protection without uniform increase in acoustical impedance.
3Reliability
If protective means are applied on outer openings, then protection against water and particle intrusion is improved, but sound transmission characteristics are negatively affected
Solution Approach 1:
The porous polymeric foam material is specifically designed with cell structures that block liquid and particles while allowing acoustic waves to pass through with minimal attenuation. The pore size is controlled to be smaller than contaminant particles but larger than acoustic wavelengths, achieving protection without degrading sound transmission characteristics.
Solution Approach 2:
The protective layer is designed to copy or mimic the acoustic properties of the original opening, maintaining the same sound transmission characteristics while adding protection functionality. The hydrophobic coating and porous structure are engineered to be acoustically invisible while providing robust protection against water and particle intrusion.
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 method provides a high level of protection against liquid and particle intrusion while maintaining minimal acoustic attenuation, ensuring the protected components operate effectively with consistent sound quality.
Implementation Method 1
activating said adhesive material by subjecting said textile structure to heat and pressure, so as to bond said two fabric layers together
Implementation Method 2
activating said adhesive material by subjecting said textile structure to heat and pressure
Data Source
Figure 1
Figure 2~4
AI summary
A method for laminating or coupling a first and second precision fabric layers each being formed by weaving a plurality of synthetic monofilaments to achieve a two-layer textile structure, for application to loudspeakers and microphones of electronic devices in general providing at least an audio function, either a sound emitting (voice or music) or receiving function, both for protecting said electronic device from water and solid particle intrusion and for preserving the designed sound emitting and receiving characteristics, the method comprising coupling the first and second layers by a glueing material sprayed on the synthetic monofilaments of at least one of the first and second precision fabric layers.