Magnetic Field Screening Multi-Layer Textile Construction
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Solution Overview
Problem
Conventional methods for protecting acoustic components in electronic devices from magnetic fields and environmental contaminants result in complex designs that compromise sound transmission and increase acoustic impedance, with existing solutions either lacking in protection or being costly and difficult to assemble.
Innovation Solution
A multi-layer textile construction using a ferromagnetic alloy fabric, such as AISI 430, integrated with a synthetic monofilament fabric to provide magnetic field screening, protection against particles and liquids, and improved acoustic performance, simplifying assembly and reducing weight and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional protective devices (porous protective devices, molded plastic bars, metal mesh nets) are applied to protect acoustic components, then protection against environmental contaminants is improved, but magnetic field screening is insufficient and acoustic performance deteriorates
Solution Approach 1:
The patent applies a composite material solution by combining a ferromagnetic alloy fabric layer (AISI 430) with a synthetic monofilament fabric layer. The ferromagnetic alloy fabric provides magnetic field screening capability while the synthetic fabric provides protection against environmental contaminants. This composite structure resolves the contradiction by integrating multiple functions into a single protective assembly, eliminating the need for separate protective devices that would compromise acoustic performance.
2Reliability
If multiple protective layers are assembled to provide full protection and magnetic field screening, then protection level is improved, but device complexity and assembly difficulty increase
Solution Approach 1:
The patent merges multiple protective functions into a single integrated assembly. Instead of using separate porous protective devices, molded plastic bars, metal mesh nets, and magnetic shielding plates that would require complex assembly, the invention combines the ferromagnetic alloy fabric and synthetic monofilament fabric into one layered construction that provides both protection and magnetic field screening simultaneously. This reduces assembly complexity while maintaining full protection levels.
3Object-affected harmful factors
If conventional protective structures (perforated plates, metal mesh) are used for magnetic field screening, then magnetic field blocking is improved, but acoustic impedance increases and sound transmission deteriorates
Solution Approach 1:
The patent uses thin film structures (fabric layers) instead of rigid conventional protective structures like perforated plates and metal mesh. The ferromagnetic alloy fabric and synthetic monofilament fabric are thin, flexible materials that provide magnetic field screening while maintaining low acoustic impedance. The fabric construction allows sound waves to pass through with minimal obstruction compared to rigid structures, thus reducing acoustic impedance while blocking magnetic fields.
4Object-affected harmful factors
If ferromagnetic material is used for magnetic field screening, then magnetic field blocking is improved, but weight and cost increase
Solution Approach 1:
The patent employs thin film fabric construction (ferromagnetic alloy fabric with 17-30 threads/cm and thickness of 0.02-0.08 mm) instead of bulk ferromagnetic materials like perforated plates or metal mesh. This thin film approach provides effective magnetic field screening while significantly reducing the weight and cost of the protective assembly. The fabric form factor minimizes material usage while maintaining the necessary magnetic shielding properties.
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 effectively reduces magnetic field interference, enhances protection against contaminants, and maintains or improves acoustic performance, while simplifying the assembly process and reducing overall thickness and weight, offering a more efficient and cost-effective solution compared to traditional methods.
Implementation Method 1
a multi-layer textile construction for magnetic field protecting and screening applications... made by coupling a ferromagnetic alloy technical fabric... with a synthetic monofilament technical fabric... The top layer comprises a square mesh technical fabric made of a ferromagnetic alloy steel material... allows to achieve magnetic field screening properties
Implementation Method 2
providing protection against solid particles and liquids... The bottom layer is constituted by a square mesh technical fabric made of a polyester (PET) monofilament... providing protection against polluting particles and liquids
Implementation Method 3
maintains or improves acoustic performance... allowing passage of the sound produced by the loudspeaker... good sound transmission characteristics
Data Source
AI summary
A laminated double-layer textile product comprises a square mesh ferromagnetic alloy metal filament or thread technical fabric layer coupled to a square mesh synthetic monofilament technical fabric layer by laminating to provide a diffused joining of said two layers, said laminating comprising a hot-melt laminating.