Noise Suppression Sheet With Interposed Non-Magnetic Metal Layer
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Solution Overview
Problem
As digital circuit speeds increase, electronic apparatuses face erroneous operations and adverse human effects due to electromagnetic noise, necessitating improved noise suppression technologies.
Innovation Solution
A noise suppression sheet with a three-layer structure comprising metal magnetic layers (FeNi, FeSiAl, or FeNiCo alloys) and a non-magnetic metal layer (Cu or Al) interposed between them, providing excellent magnetic shielding characteristics and thinning flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-layer magnetic shielding structure is used, then the structure is simple, but the magnetic shielding performance on both surfaces is insufficient
Solution Approach 1:
The magnetic shielding sheet is divided into multiple functional layers: first and second magnetic layers (providing magnetic shielding), a non-magnetic metal layer (providing electrical conductivity), and intermediate layers. This segmentation allows each layer to perform its specific function optimally, achieving superior bidirectional magnetic shielding performance while maintaining reasonable structural complexity
Solution Approach 2:
The layers are arranged in a nested configuration where the non-magnetic metal layer is positioned between the two magnetic layers, with intermediate layers nested between them. This nested structure enables the inner layers to be protected by outer layers while contributing to the overall magnetic shielding effectiveness from both surfaces
2Reliability
If the thickness of metal magnetic layers is increased, then magnetic shielding performance improves, but the sheet becomes thicker and less flexible
Solution Approach 1:
The thickness of each magnetic layer is precisely controlled within 1-20 μm, and the non-magnetic metal layer thickness is controlled within 1-20 μm. By optimizing these parameter ranges, the patent achieves effective magnetic shielding performance while keeping the overall sheet thin and flexible, resolving the contradiction between shielding effectiveness and thickness
Solution Approach 2:
The patent combines magnetic materials (for shielding) with non-magnetic metal materials (for conductivity and flexibility) in a composite layered structure. This composite approach allows the sheet to achieve magnetic shielding performance without requiring excessive thickness of individual magnetic layers, as the non-magnetic metal layers contribute to the overall functionality and flexibility
3Reliability
If conventional magnetic shielding materials are used, then magnetic shielding is achieved, but flexibility and thinning capability are limited
Solution Approach 1:
The patent employs thin-film technology to create magnetic layers and non-magnetic metal layers with thicknesses of 1-20 μm. These thin films provide the necessary magnetic shielding performance while inherently offering flexibility and conformability, allowing the sheet to be easily applied to various surfaces and components without rigid structural support
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 sheet effectively absorbs and suppresses noise on both surfaces, maintaining high magnetic shield performance even at high frequencies, while allowing for thinning and improved flexibility.
Implementation Method 1
a pair of metal magnetic layers and a non-magnetic metal layer interposed between the pair of metal magnetic layers
Implementation Method 2
the non-magnetic metal layer is composed of at least one selected from the group consisting of Cu and Al
Data Source
AI summary
A noise suppression sheet comprises a pair of metal magnetic layers and a non-magnetic metal layer interposed between the pair of metal magnetic layers, and can achieve high magnetic shield characteristics on both surfaces.