Resin Casing Electronic Unit with Heat Diffusion Sheet
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Solution Overview
Problem
Conventional electronic units in vehicular lamps face heat dissipation challenges due to the use of heat-generating components, which can lead to temperature-related issues and damage, especially when housed in sealed resin casings that hinder heat dissipation, increasing weight and cost when metal is used for improved conductivity.
Innovation Solution
Incorporating a heat diffusion sheet between the electronic body and the resin casing to diffuse and dissipate heat generated by heat-generating components, allowing for effective heat transfer and dissipation even with a resin casing, thereby reducing weight and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the casing is made of metal to improve heat dissipation, then heat dissipation effect is improved, but weight increases and manufacturing complexity increases
Solution Approach 1:
The invention uses a composite structure combining resin (for weight reduction and cost) with a heat diffusion sheet (for thermal management). This composite approach achieves effective heat dissipation without the weight and cost penalties of pure metal casings, resolving the contradiction between heat dissipation performance and weight.
Solution Approach 2:
The heat diffusion sheet acts as an intermediary component between the heat-generating electronic body and the resin casing. It mediates the thermal transfer process, enabling efficient heat dissipation through the resin casing without requiring the casing itself to be made of high-conductivity metal material.
2Temperature
If the casing is made of metal to improve heat dissipation, then heat dissipation effect is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The composite structure of resin casing plus heat diffusion sheet simplifies manufacturing compared to metal casings. The resin can be molded using standard injection molding processes, and the heat diffusion sheet can be integrated through simple assembly, avoiding complex metal forming and machining operations.
Solution Approach 2:
The heat diffusion sheet serves as a separate intermediary component that can be manufactured independently and then integrated with the resin casing. This modular approach simplifies the overall manufacturing process compared to creating a monolithic metal casing with integrated heat dissipation features.
3Reliability
If the casing is sealed to prevent dust entry, then protection against dust is improved, but heat dissipation deteriorates
Solution Approach 1:
The heat diffusion sheet acts as an internal intermediary that enables heat to be distributed and dissipated throughout the sealed casing volume. This allows the casing to remain sealed for dust protection while still achieving effective heat dissipation through the resin material itself.
Solution Approach 2:
The invention changes the thermal parameters of the sealed environment by introducing the heat diffusion sheet, which modifies the heat transfer characteristics within the sealed casing. This allows heat to be effectively managed even though the sealing structure prevents convective heat loss to the outside environment.
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 enhances heat dissipation efficiency, preventing temperature-related issues and ensuring stable lighting control while reducing the weight and cost associated with using metal casings.
Implementation Method 1
heat generated by the heat generating component of the electronic body is diffused in a planar direction of the heat diffusion sheet, by the heat diffusion sheet
Implementation Method 2
dissipated via the casing
Data Source
AI summary
An electronic unit includes an electronic body on which a heat generating component is mounted; a resin casing in which the electronic body is housed; and a heat diffusion sheet interposed between the casing and a region of the electronic body where the heat generating component is mounted.