Electronic Device Shielding Can and Cooling Member Design
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Solution Overview
Problem
Electronic devices face challenges in achieving simultaneous heat dissipation, electromagnetic wave suppression, and electrostatic discharge (ESD) protection, as existing solutions either compromise on heat dissipation or fail to effectively suppress electromagnetic waves due to the use of metal heat dissipating components which act as antennas for harmonic noise.
Innovation Solution
An electronic device design featuring an electrically conductive shielding can connected to ground, a thermally and electrically conductive sheet between the electronic component and cooling member, and an insulating member to prevent ESD, allowing for effective heat dissipation and electromagnetic wave absorption while providing ESD protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a metal heat dissipating component is disposed close to the electronic component, then heat dissipation is improved, but electromagnetic wave suppression deteriorates because the metal component acts as an antenna for harmonic noise
Solution Approach 1:
The heat dissipating component is divided into multiple independent heat dissipation fins rather than a single continuous metal structure. This segmentation reduces the antenna effect and harmonic noise radiation while maintaining heat dissipation effectiveness through the distributed fin structure.
Solution Approach 2:
An insulating member is introduced as an intermediary between the electronic component and the heat dissipating component. This insulating member electrically isolates the metal heat dissipation structure from the electronic component, preventing the metal from acting as an antenna while still allowing thermal conduction through the insulating member's thermally conductive path.
2Temperature
If a shielding case with a hole for heat dissipation fin is provided, then heat dissipation is maintained, but electromagnetic wave suppression deteriorates
Solution Approach 1:
The shielding case is designed with multiple small holes instead of a single large opening, and the heat dissipation fins are segmented to pass through these holes. This segmentation reduces electromagnetic wave radiation while maintaining heat dissipation through the distributed fin structure.
Solution Approach 2:
The heat dissipating component uses a composite structure combining metal for thermal conduction with insulating materials for electromagnetic isolation. The insulating member integrated into the heat dissipation fin structure provides both thermal conduction path and electromagnetic shielding, achieving dual functionality.
3Reliability
If an insulating member is provided between the electronic component and cooling member, then ESD protection is improved, but heat dissipation deteriorates
Solution Approach 1:
The insulating member is constructed as a composite material that combines electrical insulation properties with high thermal conductivity. This allows the member to provide ESD protection by blocking electrical discharge while simultaneously maintaining effective heat dissipation through its thermally conductive structure.
Solution Approach 2:
The insulating member's thermal and electrical parameters are specifically optimized to achieve the desired balance. By controlling the material composition and structural parameters, the member provides sufficient electrical insulation for ESD protection while maintaining adequate thermal conductivity 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 solution enables simultaneous achievement of high-level heat dissipation, electromagnetic wave suppression, and ESD protection by utilizing a conductive shielding can, thermally and electrically conductive sheet, and insulating member, effectively managing heat transfer and electromagnetic interference while preventing static electricity from reaching sensitive components.
Implementation Method 1
a thermally and electrically conductive sheet provided between the electronic component and the electrically conductive cooling member
Implementation Method 2
an electrically conductive shielding can having an opening and provided so as to surround the electronic component and connected to a ground
Implementation Method 3
an electrically conductive cooling member provided on an upper portion of the electrically conductive shielding can
Implementation Method 4
measures for heat dissipation in the electronic devices, a heat radiator plate made of a metal material having a high thermal conductivity such as copper or aluminum, a heat pipe, a heat sink
Implementation Method 5
an insulating member provided between the thermally and electrically conductive sheet and the electrically conductive cooling member and facing the electronic component through the opening
Data Source
AI summary
Provided is an electronic device capable of simultaneously achieving heat dissipation, electromagnetic wave suppression effect and ESD protection at a high level. The device includes: an electronic component 30 provided on a substrate 31; an electrically conductive shielding can 20 having an opening 21 and provided so as to surround the electronic component 30 and connected to a ground 32; an electrically conductive cooling member 40 provided on the top of the electrically conductive shielding can 20; a thermally and electrically conductive sheet 10 provided between the electronic component 30 and the electrically conductive cooling member 40; and an insulating member 50 provided between the thermally and electrically conductive sheet 10 and the electrically conductive cooling member 40 and facing the electronic component 30 through the opening 21, wherein the insulating member 50 has a size equal to or larger than the region of the electronic component 30 facing through the opening 21, and the electrically conductive shielding can 20 and the electrically conductive cooling member 40 are electrically connected through the thermally and electrically conductive sheet 10.