Conductive Elastic Gasket Rib Segmentation for EMI Stability

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Solution Overview

Problem

Existing electronic apparatuses with electromagnetic interference (EMI) gaskets tend to roll and positionally deviate when compressed, leading to unnecessary emission of electromagnetic noise due to inadequate contact between the gasket and the housing surfaces.

Innovation Solution

Incorporating a pair of first ribs with inclined surfaces on the housing inner surface, which compresses the electrically conductive elastic gasket, preventing it from rolling and ensuring continuous contact to reduce electromagnetic noise emission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the EMI gasket is compressed to ensure electrical continuity, then electrical conductivity is improved, but the gasket rolls and positionally deviates

Engineering Contradiction:

Improveelectrical continuityVSAvoidpositional stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The housing inner surface is segmented into multiple regions by protrusions, creating distinct compression zones. The EMI gasket is divided into multiple compressed regions corresponding to these zones, preventing lateral movement and rolling while maintaining electrical continuity through each compression point.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The compression force is distributed to different locations of the EMI gasket through multiple protrusions rather than a single point. This localized compression approach ensures the gasket remains positionally stable while maintaining electrical conductivity at multiple contact points.

Inventive Principle:

Principle #3Local quality

2Reliability

If the EMI gasket is compressed to ensure contact, then electrical conductivity is improved, but electromagnetic noise emission increases due to rolling

Engineering Contradiction:

Improveelectrical continuityVSAvoidelectromagnetic noise

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

By segmenting the compression into multiple localized zones through protrusions, the gasket is prevented from rolling and positionally deviating. This ensures stable electrical contact at each compression point, thereby maintaining shielding effectiveness and reducing electromagnetic noise emission.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The compression force that could potentially cause the gasket to roll and create noise is converted into a beneficial localized compression at multiple fixed points. The protrusions guide the compression to act vertically on the gasket, transforming a potential harmful rolling motion into stable electrical contact points that reduce electromagnetic noise.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If the gasket is compressed between the outer shell and housing surface, then electrical continuity is achieved, but the gasket moves outside the intended region

Engineering Contradiction:

Improveelectrical continuityVSAvoidpositional constraint

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The housing inner surface is divided into multiple compression zones by protrusions, creating defined regions where the EMI gasket is compressed. This segmentation prevents the gasket from moving laterally outside the intended region while ensuring electrical continuity at each compression point.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The protrusions act as intermediary structures between the housing inner surface and the EMI gasket. They provide localized compression points that constrain the gasket within the intended region while maintaining electrical continuity, serving as mediators that prevent both rolling and lateral movement.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 configuration effectively inhibits the gasket from rolling and maximizes contact area, reducing electromagnetic noise emission and ensuring reliable electrical connectivity.

Implementation Method 1

The electrically conductive elastic member has conductivity and elasticity and is disposed between the outer shell of the electronic component and the predetermined inner surface of the housing in such a way that the electrically conductive elastic member is compressed by the outer shell and the predetermined inner surface

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS11003220B2Electronic apparatus

Publication Date: 2021.05.11 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

An electronic apparatus includes a housing having conductivity, an electronic component includes an outer shell having conductivity, and an electrically conductive elastic member. The electrically conductive elastic member has conductivity and elasticity and is disposed between the outer shell of the electronic component and a predetermined inner surface of the housing. A pair of ribs stand on the predetermined inner surface. The electrically conductive elastic member is disposed between the pair of the ribs. The ribs have facing side surfaces facing each other, each of the facing side surfaces has an inclined surface in such a way that each of the facing side surfaces and the predetermined inner surface is in continuous contact with a corresponding part of an outer surface of the electrically conductive elastic member that is compressed, each of the facing side surfaces and the predetermined inner surface facing the corresponding part of the outer surface.