Joined Body With Varying Metal Nanoparticle Density
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Solution Overview
Problem
Existing joined bodies in projectors face challenges in balancing heat transfer and impact resistance, as high metal nanoparticle density enhances heat transfer but may lead to damage under impact, while low density improves impact resistance but compromises heat transfer.
Innovation Solution
A joined body with a joining film having regions of varying metal nanoparticle densities, where a high-density region for efficient heat transfer and a low-density region for impact resistance are strategically positioned, allowing for efficient heat transfer and stress relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the metal nanoparticle density in the joining film is increased to enhance heat transfer, then the heat transfer property between substrates is improved, but the joining film becomes more rigid and less able to relieve impact stress
Solution Approach 1:
The joining film is designed with spatially varying metal nanoparticle density: a first region with higher density for efficient heat transfer and a second region with lower density for impact stress relief. This local differentiation allows each region to optimize its function based on local requirements.
Solution Approach 2:
The joining film is segmented into multiple regions with different nanoparticle densities. The first region (higher density) and second region (lower density) are distinct zones that together form the complete joining film, allowing simultaneous optimization of heat transfer and impact resistance.
2Ease of manufacture
If the metal nanoparticle density is made uniform throughout the joining film, then the manufacturing process is simplified, but the ability to simultaneously optimize heat transfer and impact resistance is lost
Solution Approach 1:
Rather than using uniform density throughout, the invention applies local quality by varying the metal nanoparticle density across different regions of the joining film. This allows the structure to adapt to different functional requirements in different locations.
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 enhances heat transfer between substrates while relieving stress due to impact loads, maintaining structural integrity and thermal management in projector components.
Implementation Method 1
The joined body transfers the heat of the second substrate to the first substrate to suppress an increase in the temperature of the second substrate
Implementation Method 2
The metal nanoparticles have a high bonding property and can bond the substrates to each other at a far lower temperature than the melting point of a metal constituting the metal nanoparticles
Implementation Method 3
Even if the first substrate and the second substrate have different thermal expansion coefficients, the occurrence of a crack between the first substrate and the second substrate is suppressed by elongation of the metal foil
Data Source
AI summary
A joined body includes a first substrate, a second substrate which faces the first substrate, and a joining film which joins the first substrate to the second substrate, wherein the joining film has a first region and a second region, and in a plan view of the first substrate, the first region has a higher metal nanoparticle density than the second region.