Light-Emitting Device Heat Dissipation via Intermediary Gap Layer
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Solution Overview
Problem
Existing light emitting devices face issues with heat dissipation efficiency due to gaps between the light emitting section and the heat conducting member, leading to temperature rises and reduced luminous efficiency, as well as positional shifts and mechanical stress caused by thermal expansion differences.
Innovation Solution
A light-emitting device design where a light-transmitting heat conducting member is positioned to face the excitation light irradiation surface, with a gap layer filling the gap between the heat conducting member and the excitation light irradiation surface to enhance heat absorption efficiency, and a supporting mechanism to prevent mechanical stress-induced detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a light-transmitting heat conducting member is positioned to face the excitation light irradiation surface, then heat dissipation efficiency is improved, but a gap between the heat conducting member and the light emitting section causes reduced heat absorption efficiency
Solution Approach 1:
A gap layer is introduced as an intermediary substance between the light-transmitting heat conducting member and the excitation light irradiation surface. This gap layer fills the spatial gap to enable effective thermal contact while maintaining optical transparency, allowing heat to be conducted from the light emitting section to the heat conducting member without compromising the light transmission path.
Solution Approach 2:
The gap layer is formed using a low-cost, simple material application process that creates a thin filling layer. This approach uses inexpensive materials and straightforward manufacturing methods to achieve the necessary thermal contact, avoiding complex precision positioning mechanisms or expensive specialized materials.
2Power
If the light emitting section is irradiated with high-output excitation light, then luminous efficiency is improved, but temperature rise in the light emitting section increases
Solution Approach 1:
The heat conducting member is pre-positioned to face the excitation light irradiation surface before the high-power excitation light is applied. The gap layer is pre-formed to ensure thermal contact is established in advance, creating a ready thermal conduction path that immediately activates when heat generation begins, preventing excessive temperature accumulation.
Solution Approach 2:
The gap layer serves as a thermal intermediary that facilitates heat transfer from the light emitting section to the heat conducting member. This intermediary structure ensures continuous thermal contact while allowing the light emitting section to operate at high power levels, as the heat is efficiently conducted away through the gap layer and heat conducting member.
3Adaptability or versatility
If a gap exists between the heat conducting member and the excitation light irradiation surface, then positioning flexibility is improved, but heat absorption efficiency deteriorates
Solution Approach 1:
The gap layer acts as a universal intermediary that can accommodate various gap sizes and positioning variations. It provides a compliant thermal interface that maintains effective heat conduction even when there are positional variations or manufacturing tolerances, thus preserving heat absorption efficiency while allowing positioning flexibility.
Solution Approach 2:
The gap layer's thickness and material properties can be adjusted to optimize thermal conduction across different gap conditions. By changing the physical parameters of the gap layer (such as thickness, thermal conductivity), the system can maintain effective heat absorption efficiency across a range of positioning scenarios, accommodating manufacturing tolerances and assembly variations.
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 design improves heat dissipation efficiency, prevents temperature rises, and maintains the light emitting section's position, ensuring reliable operation and extended lifespan.
Implementation Method 1
a light-transmitting heat conducting member which is provided so as to (i) face the excitation light irradiation surface and (ii) receive heat of the light emitting section
Implementation Method 2
a light emitting section including a fluorescent material which emits light in response to the excitation light
Data Source
AI summary
A headlamp disclosed includes: a laser diode for emitting a laser beam; a light emitting section including a fluorescent material which emits light in response to excitation light emitted from the laser diode; a light-transmitting heat conducting member which is provided so as to face a laser beam irradiation surface of the light emitting section and receive heat of the light emitting section; and an adhesive layer filling a gap between the heat conducting member and the laser beam irradiation surface. This arrangement improves efficiency of the heat conducting member in absorbing the heat of the light emitting section, and consequently cools the light emitting section efficiently.