Wraparound Magnetic Sheet Structure for Cable Noise Suppression

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Solution Overview

Problem

Existing methods for fixing magnetic sheets to suppress electromagnetic noise require additional members like rivets or cloth tape, increasing work steps and risking peeling, while methods using adhesive sheets may leave gaps leading to noise leakage.

Innovation Solution

A magnetic sheet with a magnetic plate, protective layer, and adhesive layer, allowing continuous wrapping and secure adhesion without interruption, ensuring uninterrupted noise suppression.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If additional members like rivets or cloth tape are used to fix the magnetic sheet, then the wrapping state can be good, but the work steps increase and productivity decreases

Engineering Contradiction:

Improvewrapping stateVSAvoidwork steps

Core Design Contradiction:

Stability of the object's compositionVSProductivity

Solution Approach 1:

The patent combines the magnetic sheet with adhesive layers integrated into its structure, merging the functions of the magnetic sheet and the fixing mechanism into a single component. This eliminates the need for separate adhesive tapes or mechanical fasteners, thereby maintaining stable wrapping while reducing work steps and improving productivity.

Inventive Principle:

Principle #5Merging (Combining)

2Ease of manufacture

If additional members like cloth tape are used to fix the magnetic sheet, then the wrapping can be achieved, but the magnetic sheet may peel off due to insufficient adhesion

Engineering Contradiction:

Improvefixing methodVSAvoidadhesion

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent employs a composite structure where the magnetic sheet is integrated with adhesive layers on its surface. This composite design combines the electromagnetic shielding properties of the magnetic material with the bonding capabilities of the adhesive, ensuring both ease of application and reliable long-term adhesion to prevent peeling.

Inventive Principle:

Principle #40Composite materials

3Device complexity

If ferrite sintered bodies are only provided on front and back sides of flat cables, then the structure is simple, but electromagnetic noise may leak from portions lacking the ferrite sintered body

Engineering Contradiction:

ImprovestructureVSAvoidelectromagnetic noise leakage

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent divides the magnetic shielding function into multiple segments by providing magnetic sheets at different locations along the cable, including front and back sides as well as lateral surfaces. This segmented approach ensures comprehensive coverage to prevent electromagnetic noise leakage while maintaining structural simplicity through modular placement.

Inventive Principle:

Principle #1Segmentation

4Reliability

If the magnetic sheet is wrapped continuously without interruption, then uninterrupted noise suppression is achieved, but the magnetic sheet may require precise dimensions for different articles

Engineering Contradiction:

Improvenoise suppressionVSAvoiddimensional flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent designs the magnetic sheet with universal dimensional specifications that can accommodate various article sizes and shapes. The continuous wrapping capability is achieved through standardized sheet dimensions and adhesive configurations that can be adapted to different applications, ensuring uninterrupted noise suppression while maintaining versatility across multiple use cases.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Facilitates easy wrapping and secure fixation, preventing peeling and noise leakage, thus enhancing noise suppression efficacy.

Implementation Method 1

an adhesive layer having a greater dimension than the magnetic plate and provided on a surface of the magnetic plate opposite to the protective layer, wherein the protective layer and the adhesive layer are formed to enable wrapping such that when the magnetic sheet is wrapped around the outer periphery of the article with the adhesive layer facing toward the article, a portion of the adhesive layer adheres to a surface of the protective layer opposite to the magnetic plate

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

a magnetic sheet including a sheet-shaped magnetic material is wrapped around, and fixed to, an article, such as a cable, which is a source of electromagnetic noise, to suppress electromagnetic noise

Methodology Applied

Scientific EffectMagnetic shielding: Magnetic Field

Data Source

PatentEP4633315A1Magnetic sheet and magnetic sheet structure comprising same

Publication Date: 2025.10.15 TODA KOGYO CORP

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AI summary

A magnetic sheet (1) comprises a magnetic plate (10) having a dimension that allows for wrapping around an outer periphery of cables (2) at least once without interruption; a protective layer (20) provided on a surface of the magnetic plate (10); and an adhesive layer (30) provided on a surface of the magnetic plate (10) opposite to the protective layer (20). The protective layer (20) and the adhesive layer (30) have a greater dimension than the magnetic plate (10), and are formed to enable wrapping such that when the magnetic sheet (1) is wrapped around the outer periphery of the cables (2) with the adhesive layer (30) facing toward the cables (2), a portion of the adhesive layer (30) adheres to a surface of the protective layer (20) opposite to the magnetic plate (10).