Formable Shielding Film for Compact Electronics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional EMI shielding solutions fail to effectively conform to complex electronic device geometries, leading to air gaps that hinder heat dissipation and reduce shielding efficacy, particularly in compact electronic systems.
Innovation Solution
A multilayer shielding film comprising a structured adhesive layer, an electrically conductive shielding layer extending beyond the adhesive layer, an electrically insulative thermally conductive layer, and an electrically conductive adhesive layer, which conforms to electronic devices on a circuit board under heat, vacuum, or pressure, providing a seal and reducing electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional EMI shielding solution is used, then electromagnetic interference is shielded, but the shielding film cannot conform to complex electronic device geometries, creating air gaps that reduce shielding efficacy and hinder heat dissipation
Solution Approach 1:
The shielding film is divided into multiple layers with distinct functions: a conformal adhesive layer that segments and adapts to complex geometries, a conductive shielding layer for EMI protection, and a thermally conductive insulative layer for heat management. This segmentation allows each layer to optimize its specific function while collectively solving the conformity problem.
Solution Approach 2:
The patent employs a thin-film multilayer structure that is inherently flexible and capable of conforming to complex three-dimensional electronic device geometries. The adhesive layer acts as a flexible intermediary that bonds the rigid shielding and thermal management layers to irregular surfaces, eliminating air gaps while maintaining shielding integrity.
2Length of moving object
If the shielding film is made thinner to maintain a thin profile for compact devices, then device compactness is improved, but shielding efficacy and heat dissipation may be compromised
Solution Approach 1:
The patent uses composite material structures where each layer is optimized for its specific function. The conductive shielding layer provides EMI protection, while the thermally conductive insulative layer manages heat. This composite approach allows thin overall thickness while maintaining both shielding efficacy and thermal performance through material optimization rather than relying on increased thickness.
Solution Approach 2:
The multilayer film structure integrates multiple functions into a single thin component: EMI shielding, thermal conduction, electrical insulation, and conformal adhesion. This multi-functionality allows the thin film to simultaneously achieve compactness, shielding efficacy, and heat dissipation without requiring separate thick components for each function.
3Temperature
If air gaps are present between the shielding film and electronic device, then conformity is reduced, but heat dissipation is hindered and shielding efficacy is reduced
Solution Approach 1:
The conformal adhesive layer is designed to be applied first, creating a preliminary bond that conforms to the electronic device geometry before the shielding and thermal management layers are bonded. This preliminary action ensures intimate contact and eliminates air gaps, establishing both conformity and thermal coupling from the outset.
Solution Approach 2:
The adhesive layer serves as an intermediary between the electronic device and the rigid shielding/thermal management layers. It mediates the geometric mismatch by deforming to conform to complex surfaces while maintaining continuous contact, thereby ensuring both conformity for shielding efficacy and thermal coupling for heat dissipation.
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 multilayer shielding film effectively reduces EMI emission and absorption, enhances heat dissipation by minimizing air gaps, and maintains a thin profile suitable for compact electronic devices, achieving a seal of at least 90% of the exposed surface area.
Implementation Method 1
an electrically insulative thermally conductive layer disposed between the electrically conductive shielding layer and the structured adhesive layer
Implementation Method 2
When the multilayer shielding film is placed on an electronic device mounted on a circuit board and under application of one or more of heat, vacuum, and pressure, the shielding film conforms to the electronic device
Implementation Method 3
the adhesive layer adheres to the circuit board providing a seal between the shielding film and the circuit board
Data Source
AI summary
A shielding film comprises multiple layers including one or more of a structured adhesive layer, an electrically conductive layer, an electrically insulative thermally conductive layer, and an electrically conductive adhesive layer. The electrically conductive shielding layer extends laterally beyond the structured adhesive layer. The electrically insulative thermally conductive layer is disposed between the electrically conductive shielding layer and the structured adhesive layer and is coextensive with the structured adhesive layer. The electrically conductive adhesive layer is disposed between the electrically conductive shielding layer and the thermally conductive layer and is coextensive with the electrically conductive shielding layer. When the multilayer shielding film is placed on an electronic device mounted on a circuit board and under application of one or more of heat, vacuum, and pressure, the multilayer shielding film conforms to the electronic device and the electrically conductive adhesive layer adheres to the circuit board providing a seal between the multilayer shielding film and the circuit board.