Graphite Sheet Shielding for Cooling Device Vibration Fragments
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Solution Overview
Problem
The brittleness of graphite sheets used in cooling devices for heat dissipation poses a risk of fragmentation, which can lead to small pieces adhering to circuit boards, potentially causing short circuits due to vibrations and other external forces.
Innovation Solution
A cooling device design that incorporates a shielding portion made of insulating material, which covers the circuit-board-side surface of the graphite sheet and includes a support structure to prevent small pieces from adhering to the circuit board, while maintaining thermal contact between the heat conductive portion and the graphite sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a graphite sheet is used for heat dissipation, then heat dissipation performance is improved, but the graphite sheet is brittle and easily broken causing small pieces to fall on the circuit board
Solution Approach 1:
A shielding portion made of insulating material is introduced as an intermediary between the graphite sheet and the circuit board. This shielding portion prevents direct contact between potential graphite fragments and the circuit board, thereby maintaining reliability while preserving the heat dissipation function of the graphite sheet.
Solution Approach 2:
The shielding portion is positioned in advance to cover the circuit board surface beneath the graphite sheet. This preemptive protective measure ensures that even if the graphite sheet breaks, the fragments cannot reach and damage the circuit board, thus cushioning against potential failures before they occur.
2Use of energy by moving object
If the graphite sheet is placed close to the circuit board for efficient heat transfer, then heat dissipation efficiency is improved, but small pieces of graphite sheet can adhere to the circuit board causing short circuits
Solution Approach 1:
The shielding portion acts as a physical barrier and intermediary layer between the graphite sheet and the circuit board. It allows the graphite sheet to maintain its close proximity to the circuit board for efficient heat transfer while simultaneously preventing graphite fragments from adhering to the circuit board, thus eliminating the harmful effect.
3Volume of moving object
If the graphite sheet is made thinner to reduce size, then device compactness is improved, but the graphite sheet becomes more brittle and prone to breaking
Solution Approach 1:
The shielding portion serves as a compensatory protective structure that offsets the reduced strength of thinner graphite sheets. By providing a protective barrier beneath the graphite sheet, the shielding portion allows the use of thinner, more compact graphite sheets without increasing the risk of fragments reaching the circuit board.
4Temperature
If vibrations are increased to improve cooling efficiency, then heat dissipation performance is improved, but the graphite sheet is more likely to break into small pieces
Solution Approach 1:
The shielding portion is positioned in advance to cover the circuit board surface beneath the graphite sheet. This preemptive protective measure ensures that even if vibrations cause the graphite sheet to break, the fragments cannot reach and damage the circuit board, thus cushioning against potential failures before they occur.
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 shielding portion effectively prevents small graphite pieces from adhering to the circuit board, enhancing the durability and reliability of the cooling device against vibrations and ensuring reliable heat dissipation.
Implementation Method 1
a heat conductive portion (5) that contacts both a part of the graphite sheet (4) and the heat-generating component (7)
Implementation Method 2
A cooling device design that incorporates a shielding portion made of insulating material, which covers the circuit-board-side surface of the graphite sheet
Data Source
AI summary
A cooling device includes: an electronic component; a circuit board on which the electronic component is mounted; and a heat sink provided to dissipate heat to an outside of the cooling device. The cooling device also includes: a graphite sheet integrally provided on a surface of the heat sink on one side facing the electronic component; a heat conductive portion contacting both a part of the graphite sheet and the electronic component; and a shielding portion. The shielding portion is provided at a position between a portion of the circuit board where no electronic component is mounted and the graphite sheet to cover a shielded surface of the graphite sheet.