Flexible electromagnetic shielding sheet and electronic device provided with same
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Solution Overview
Problem
Existing electromagnetic shielding sheets lack flexibility and effective electrical energization, limiting their ability to enhance electromagnetic shielding efficiency when adhered to electromagnetic wave generating units.
Innovation Solution
A flexible electromagnetic shielding sheet comprising a pressure-sensitive adhesive tape with an electrically conductive adhesive layer, a fiber web, and a metal layer, where the adhesive layer is energized by applied pressure to improve electrical connectivity and shielding efficiency, and an insulation film is used to enhance flexibility and shielding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional adhesive layer is used for electromagnetic shielding sheet, then the adhesive function is provided, but the electromagnetic shielding function cannot be performed due to lack of electrical energization
Solution Approach 1:
The adhesive layer is designed to perform dual functions: providing adhesion between the electromagnetic shielding sheet and the substrate, and simultaneously serving as an electrically conductive path for electromagnetic shielding. This is achieved by incorporating conductive materials (such as metal particles, carbon black, or conductive polymers) into the adhesive composition, allowing the same layer to fulfill both bonding and shielding roles, thereby resolving the contradiction between functional reliability and manufacturing simplicity
Solution Approach 2:
The patent merges the adhesive layer and the electromagnetic shielding layer into a single integrated structure. The adhesive layer is formulated with conductive fillers to provide both adhesive properties and electrical conductivity, eliminating the need for separate adhesive and shielding layers. This consolidation improves electromagnetic shielding reliability while maintaining ease of manufacture by reducing the number of manufacturing steps and material layers
2Adaptability or versatility
If rigid electromagnetic shielding sheets are used, then electromagnetic shielding is effective, but flexibility and adaptability to complex positions are reduced
Solution Approach 1:
The electromagnetic shielding sheet is constructed using flexible substrate materials (such as flexible polymers, thin metal foils, or fabric-based composites) that can be bent, folded, or conformally attached to complex surfaces. The shielding functionality is maintained through the use of conductive adhesive layers and conductive coatings that remain effective even when the sheet is flexed, thus achieving both flexibility and shielding reliability
Solution Approach 2:
The patent employs composite material structures combining flexible substrates with conductive layers. The substrate provides flexibility and mechanical strength, while the conductive adhesive layer and conductive coatings provide electromagnetic shielding. The composite structure ensures that the shielding performance is maintained even when the sheet is deformed or bent to fit complex positions, resolving the contradiction between adaptability and shielding efficiency
3Reliability
If electrical energization capability is increased for better shielding, then electromagnetic shielding efficiency improves, but the complexity of the adhesive layer structure increases
Solution Approach 1:
The adhesive layer is designed to perform dual functions: providing adhesion between the electromagnetic shielding sheet and the substrate, and simultaneously serving as an electrically conductive path for electromagnetic shielding. This is achieved by incorporating conductive materials (such as metal particles, carbon black, or conductive polymers) into the adhesive composition, allowing the same layer to fulfill both bonding and shielding roles, thereby resolving the contradiction between functional reliability and manufacturing simplicity
Solution Approach 2:
The electrical conductivity of the adhesive layer is optimized by adjusting the concentration, size, and distribution of conductive fillers within the adhesive matrix. By controlling these parameters, the adhesive layer achieves sufficient electrical conductivity for effective electromagnetic shielding without requiring complex multi-layer structures or additional processing steps, thus improving shielding efficiency while maintaining structural simplicity
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 provides a flexible electromagnetic shielding sheet that effectively increases electromagnetic shielding efficiency by wrapping and packaging electromagnetic wave generating units, allowing for improved electrical energization and installation in complex or bent positions, thereby enhancing electromagnetic wave shielding performance.
Implementation Method 1
the electrically conductive adhesive layer formed on either side of the fiber-accumulating substrate and made of an electrically conductive adhesive material filled in the plurality of pores, to be electrically connected to fiber-accumulating type substrate by an applied pressure
Implementation Method 2
a metal layer formed on at least one surface of the fiber web to shield electromagnetic waves
Data Source
AI summary
Provided are a flexible electromagnetic shielding sheet and an electronic device having the same. The flexible electromagnetic shielding sheet includes: a pressure-sensitive adhesive tape having an electrically conductive adhesive layer on one surface thereof; a fiber web adhered to the electroconductive adhesive layer and formed by accumulating fibers; a metal layer formed on at least one surface of the fiber web to shield electromagnetic waves; and an insulating film bonded to the fiber web on which the metal layer is formed. Further, the pressure-sensitive adhesive tape includes: a fiber-accumulating type substrate formed by accumulating a plurality of fibers and having a plurality of pores; and an electrically conductive adhesive layer formed on either surface of the fiber-accumulating type substrate, and made of an electrically conductive adhesive material filled in the plurality of pores and electrically connected to the fiber-accumulating type substrate by an applied pressure.