Cover Device Graphite Sheet Heat Dissipation Surface Quality
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Solution Overview
Problem
Portable information devices with cover devices face challenges in maintaining heat dissipation performance while avoiding quality deterioration in appearance and touch due to uneven shapes caused by graphite sheets during manufacturing.
Innovation Solution
A cover device with a core material, a graphite sheet laminated on the surface, an auxiliary sheet softer than the core material, and a surface material, which prevents the transfer of uneven shapes and ensures efficient heat dissipation by covering the entire surface of the graphite sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a graphite sheet is provided inside the cover device to diffuse heat, then heat dissipation performance is improved, but uneven shapes due to bubbles or wrinkles are transferred to the surface material, deteriorating appearance and touch quality
Solution Approach 1:
A resin layer is introduced as an intermediary substance between the graphite sheet and the surface material. This resin layer acts as a mediator that prevents the transfer of uneven shapes from the graphite sheet to the surface material, while still allowing heat to be effectively diffused from the chassis through the graphite sheet to the cover device surface.
Solution Approach 2:
The cover device employs a composite structure consisting of multiple layers: the graphite sheet for heat diffusion, the resin layer for defect prevention, and the surface material for aesthetic and tactile quality. This composite material approach allows each layer to fulfill its specific function while collectively resolving the contradiction between heat dissipation and appearance quality.
2Reliability
If a cover device is mounted on the back surface of the chassis, then protection and decoration are improved, but heat dissipation is restricted, causing internal temperature to increase
Solution Approach 1:
The graphite sheet utilizes its unique thermal properties to facilitate phase transition of heat energy, converting concentrated heat from the chassis into diffused heat across the cover device surface. This allows the cover device to maintain its protective and decorative functions while effectively managing heat dissipation.
3Ease of manufacture
If the graphite sheet is directly laminated to the surface material, then manufacturing is simplified, but uneven shapes are transferred to the surface material, deteriorating quality
Solution Approach 1:
The resin layer serves as an intermediary between the graphite sheet and surface material, maintaining the lamination manufacturing process while preventing defect transfer. This intermediary layer allows the manufacturing process to remain simple and efficient while achieving high surface quality.
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 effectively prevents quality deterioration in appearance and touch while maintaining heat dissipation performance, ensuring the portable information device operates efficiently and maintains high performance.
Implementation Method 1
heat generated from the chassis can be diffused by this graphite sheet
Data Source
AI summary
A portable information device includes a chassis with a heating element housed inside, and a cover device which covers the back surface of the chassis. The cover device has a core material, a graphite sheet laminated on the surface of the core material, an auxiliary sheet laminated on the surface of the graphite sheet and softer than the core material, and a surface material laminated on the surface of the auxiliary sheet to form the surface of the cover device and softer than the auxiliary sheet.