Magnetic Shield Material Optimized for Frequency Band

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Solution Overview

Problem

Conventional magnetic shield materials formed by stacking a magnetic layer and an electrically conductive layer cannot consistently achieve a significant magnetic field shield effect in the frequency band of electromagnetic waves to be shielded.

Innovation Solution

The magnetic shield material is designed with an electrically conductive layer of specific thickness optimized for the frequency band of electromagnetic waves to be shielded, using materials like aluminum for the conductive layer and soft magnetic materials like amorphous metals for the magnetic layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a magnetic layer and an electrically conductive layer are simply stacked to reduce cost, then manufacturing cost is reduced, but the magnetic field shield effect in the frequency band of electromagnetic waves to be shielded is insufficient

Engineering Contradiction:

Improvemanufacturing costVSAvoidmagnetic field shield effect

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent optimizes the thickness of the electrically conductive layer as a key parameter to maximize the magnetic field shield effect at specific frequency bands. By carefully controlling the thickness parameter of the conductive layer, the invention achieves effective noise shielding while maintaining cost-effectiveness through the stacked layer structure.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a composite structure consisting of a magnetic layer and an electrically conductive layer stacked together. This composite material approach combines the magnetic shielding properties of the magnetic layer with the electromagnetic reflection/absorption properties of the conductive layer, achieving effective shielding across different mechanisms while maintaining manufacturing simplicity.

Inventive Principle:

Principle #40Composite materials

2Reliability

If high relative permeability materials such as permalloy are used to achieve significant magnetic field shield effect, then the magnetic field shield effect is improved, but the manufacturing cost increases due to heat treatment requirements and Ni content

Engineering Contradiction:

Improvemagnetic field shield effectVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces expensive permalloy materials with more cost-effective magnetic materials that do not require complex heat treatment processes. By using alternative magnetic materials combined with an electrically conductive layer, the invention achieves comparable shielding performance at lower manufacturing costs, effectively substituting expensive materials with cheaper alternatives.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent uses a composite structure of magnetic layer and electrically conductive layer to compensate for the lower relative permeability of the magnetic material. The combination of magnetic shielding and electromagnetic reflection/absorption mechanisms in the composite structure achieves effective shielding performance without relying on expensive high-permeability materials like permalloy.

Inventive Principle:

Principle #40Composite 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 design enables the magnetic shield material to achieve a good magnetic field shield effect in the targeted frequency band, effectively reducing electromagnetic noise interference.

Implementation Method 1

an electrically conductive layer (3) containing an electrically conductive material... to maximize magnetic field shield effect

Methodology Applied

Scientific EffectElectromagnetic reflection: Reflection

Implementation Method 2

the thickness of the electrically conductive layer is a thickness to maximize magnetic field shield effect of the magnetic shield material in the frequency band of electromagnetic wave to be shielded

Methodology Applied

Scientific EffectElectromagnetic absorption: Absorption (EM radiation)

Implementation Method 3

a magnetic layer (2) containing a magnetic material... the magnetic field shield effect is generally determined by the relative permeability and the thickness of a high relative permeability material

Methodology Applied

Scientific EffectMagnetic permeability: Magnetic Field

Data Source

PatentEP3886550B1Magnetic shield material

Publication Date: 2025.06.18 KITAGAWA INDS

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AI summary

In a magnetic shield material comprising a magnetic layer containing a magnetic material and an electrically conductive layer containing an electrically conductive material, the electrically conductive layer is designed to have a thickness corresponding to a frequency band of electromagnetic wave to be shielded. More specifically, the thickness of the electrically conductive layer (thickness of the aluminum foil in the drawing) is designed to have a thickness to maximize magnetic field shield effect of the magnetic shield material (thickness of the aluminum foil corresponding to peak value frequency in curve E in the drawing) in a frequency band of electromagnetic wave to be shielded. This makes it possible to obtain good magnetic field shield effect of the magnetic shield material in the frequency band of electromagnetic wave to be shielded.