Laminated Electromagnetic Shielding Material with Insulating Layers
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Solution Overview
Problem
Conventional electromagnetic shielding materials face challenges in achieving improved shielding effects while reducing weight and ensuring formability, as resin and carbon fiber materials lack shielding properties, and thin metallic materials compromise on both weight reduction and formability.
Innovation Solution
A laminated structure of three or more metal foils with insulating layers, where the conductivity and thickness of the metal foils and insulating layers are optimized to satisfy the equation σM×dM×dR≥3×10−3, enhancing electromagnetic shielding while reducing the total thickness of the metal foils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the thickness of metallic electromagnetic shielding material is excessively decreased, then weight reduction is achieved, but electromagnetic shielding effect deteriorates
Solution Approach 1:
The patent divides the shielding structure into multiple thin metal foil layers separated by insulating layers. This segmentation allows each metal foil to contribute to shielding while the insulating layers prevent direct electrical contact, maintaining shielding effectiveness with reduced total metal thickness and weight.
Solution Approach 2:
The patent creates a composite structure combining metal foils with insulating layers. This composite material approach leverages the electromagnetic shielding properties of metal foils while using insulating layers to maintain structural integrity and prevent short circuits, achieving effective shielding with reduced metal content.
2Weight of moving object
If the thickness of metallic electromagnetic shielding material is excessively decreased, then formability deteriorates
Solution Approach 1:
By segmenting the shielding structure into multiple thin foils with insulating layers, each component maintains adequate thickness for formability while the overall structure achieves weight reduction. The insulating layers act as spacers that prevent foil deformation during forming operations.
Solution Approach 2:
The insulating layers serve as intermediary elements between metal foils, providing mechanical support and spacing that enhances the formability of the overall structure. These intermediaries prevent direct contact between foils, reducing the risk of short circuits during forming while maintaining structural integrity.
3Object-affected harmful factors
If conventional electromagnetic shielding materials are used, then shielding effect is achieved, but weight reduction cannot be achieved
Solution Approach 1:
The patent segments the shielding function across multiple thin metal foils rather than using a single thick metal layer. This segmentation, combined with insulating layers, achieves equivalent or superior shielding effectiveness while dramatically reducing the total weight of metal material required.
Solution Approach 2:
The patent employs composite materials consisting of metal foils and insulating layers to replace conventional solid metal shielding materials. This composite approach maintains electromagnetic shielding performance while reducing weight through the use of thinner metal layers and lightweight insulating materials.
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
This approach achieves improved electromagnetic shielding with reduced metal foil thickness, enabling weight reduction and enhanced formability, along with economic efficiency, by effectively combining conductivity and thickness of metal foils and insulating layers.
Implementation Method 1
The copper foil has electromagnetic shielding properties
Implementation Method 2
lamination of three or more metal foils with insulating layers interposed therebetween has significantly improved the electromagnetic shielding effect
Data Source
AI summary
Provided is an electromagnetic shielding material having improved electromagnetic shielding properties, light weight properties and formability. The present invention relates to an electromagnetic shielding material having a structure in which at least three metal foils are laminated via insulating layers, wherein all of combinations of the metal foils and the insulating layers making up the electromagnetic shielding material satisfy the equation: σM×dM×dR≥3×10−3,in which:the symbol σM represents conductivity of each metal foil at 20° C. (S/m);the symbol dM represents the thickness of each metal foil (m); andthe symbol dR represents the thickness of each insulating layer (m).