Thin Electromagnetic Shielding Sheet With Conductive Adhesive
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Solution Overview
Problem
Current electromagnetic shielding sheets fail to enhance electromagnetic wave shielding efficiency and heat dissipation simultaneously, especially when adhered to electronic devices, due to limitations in electric current carrying capability and adhesive functionality.
Innovation Solution
A thin electromagnetic shielding sheet featuring a pressure-sensitive adhesive tape with a fiber-accumulating substrate, metal coating layers, electrically conductive adhesive layers, and an insulating layer, which is connected to the ground to improve electromagnetic wave shielding and incorporate a graphite layer for heat dissipation, ensuring efficient shielding and heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional adhesive layer is used to adhere the electromagnetic shielding sheet, then the adhesive function is provided, but the electric current carrying capability is insufficient and electromagnetic shielding efficiency is reduced
Solution Approach 1:
The adhesive layer is designed to perform dual functions: providing adhesion between the shielding sheet and the object, and simultaneously serving as an electrically conductive path for current flow. By incorporating conductive fillers (metal particles, carbon black, graphite) into the adhesive material, the layer achieves both bonding and electrical connectivity, eliminating the need for separate conductive elements and improving overall shielding efficiency.
Solution Approach 2:
The adhesive layer is formulated as a composite material combining adhesive polymers with conductive fillers such as metal particles, carbon black, or graphite. This composite structure provides both the adhesive properties needed for bonding and the electrical conductivity required for effective electromagnetic shielding, resolving the contradiction between adhesive function and current carrying capability.
2Length of moving object
If the electromagnetic shielding sheet is made thin to reduce device size, then the device miniaturization is achieved, but the heat dissipation capability is reduced
Solution Approach 1:
The substrate is designed with a porous or hollow spherical structure, providing high surface area-to-volume ratio. This porous architecture allows efficient heat dissipation through increased surface area for heat transfer, while maintaining a thin overall profile. The pores can also facilitate air circulation or thermal conduction paths, enabling effective heat management in a minimized thickness.
Solution Approach 2:
The shielding sheet employs composite material structures combining metal layers for electromagnetic shielding with porous or hollow substrate materials that provide thermal management capabilities. The composite design allows the thin structure to maintain both shielding effectiveness and heat dissipation performance through the synergistic properties of different materials.
3Strength
If the adhesive layer is made non-conductive to provide good adhesion, then the bonding strength is improved, but the electromagnetic shielding function is compromised due to lack of electrical connection
Solution Approach 1:
The adhesive layer is formulated as a composite material combining adhesive polymers with conductive fillers such as metal particles, carbon black, or graphite. This composite structure provides both the adhesive properties needed for bonding and the electrical conductivity required for effective electromagnetic shielding, resolving the contradiction between adhesive function and current carrying capability.
Solution Approach 2:
The adhesive layer is designed to perform dual functions: providing adhesion between the shielding sheet and the object, and simultaneously serving as an electrically conductive path for current flow. By incorporating conductive fillers (metal particles, carbon black, graphite) into the adhesive material, the layer achieves both bonding and electrical connectivity, eliminating the need for separate conductive elements and improving overall shielding efficiency.
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 solution significantly enhances electromagnetic wave shielding efficiency and heat dissipation capabilities, effectively addressing the limitations of existing technologies by improving electric current carrying capacity and providing a thin, efficient shielding solution for electronic devices.
Implementation Method 1
a metal coating layer on an outer circumferential surface of each of the plurality of fibers... a metal layer which is adhered to one of the electrically conductive adhesive layers on one surface of the pressure-sensitive adhesive tape to shield electromagnetic waves
Implementation Method 2
electrically conductive adhesive layers formed on both surfaces of the fiber-accumulating type substrate, and made of an electrically conductive adhesive material filled in the plurality of pores and electrically connected by an applied pressure
Implementation Method 3
a graphite layer that is adhered to the metal layer to dissipate heat transferred to the metal layer
Data Source
AI summary
Provided are a thin electromagnetic shielding sheet and an electronic device having the same. The thin electromagnetic shielding sheet includes: a pressure-sensitive adhesive tape including a fiber-accumulating type substrate, formed by accumulation of a plurality of fibers and having a plurality of pores, and a metal coating layer on an outer circumferential surface of each of the plurality of fibers, and electrically conductive adhesive layers formed on both surfaces of the fiber-accumulating type substrate, and made of an electrically conductive adhesive material filled in the plurality of pores and electrically connected by an applied pressure; a metal layer which is adhered to the electrically conductive adhesive layer on one surface of the pressure-sensitive adhesive tape to shield electromagnetic waves; and an insulating layer formed on the metal layer.