Inorganic Amorphous Gap Layer for Headlamp Thermal Management
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Solution Overview
Problem
Existing light-emitting apparatuses face inefficiencies in heat dissipation due to microscopic surface irregularities between the light-emitting element and the heat-conducting member, leading to reduced thermal conductivity and increased thermal resistance, which can cause degradation and decreased luminous efficiency.
Innovation Solution
A gap layer containing inorganic amorphous material is introduced between the light-emitting element and the heat-conducting member to enhance thermal contact and conductivity, filling the gaps and improving heat dissipation while maintaining light transmissivity and resistance to high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the heat-conducting member is brought into direct contact with the light-emitting element to improve heat dissipation, then thermal conductivity is improved, but microscopic surface irregularities create gaps that increase thermal resistance
Solution Approach 1:
An adhesive layer is introduced as an intermediary substance between the light-emitting element and the heat-conducting member. This adhesive layer fills the microscopic gaps caused by surface irregularities, ensuring reliable thermal contact while maintaining good thermal conductivity. The adhesive acts as a mediator that bridges the interface between the two components, resolving the contradiction between direct contact benefits and surface irregularity problems.
2Reliability
If a gap layer containing inorganic amorphous material is introduced to fill surface irregularities and improve thermal contact, then thermal resistance is reduced, but the device structure becomes more complex
Solution Approach 1:
The adhesive layer is combined with the gap-filling function by selecting materials and designing a structure where the adhesive simultaneously bonds the components together and fills the microscopic gaps. This merging of bonding and gap-filling functions into a single layer reduces the overall device complexity compared to having separate adhesive and gap-filling materials.
3Illumination intensity
If the light-emitting element operates at high intensity to improve luminous output, then illumination intensity is improved, but heat generation increases causing thermal damage
Solution Approach 1:
The adhesive layer with optimized thermal conductivity is designed to convert the harmful heat generated by high-intensity operation into beneficial thermal management. By providing a reliable thermal pathway, the adhesive transforms the heat that would otherwise cause damage into controllable thermal energy that can be efficiently dissipated, enabling high-intensity operation without thermal damage.
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 use of an inorganic amorphous gap layer significantly reduces thermal resistance, enabling efficient heat dissipation and preventing degradation of the light-emitting element, thus improving the reliability and luminous efficiency of the apparatus, especially in high-temperature environments.
Implementation Method 1
a gap layer that is disposed between the light emitter and the light-emitter facing surface and that conducts the heat generated by the light emitter to the light-emitter facing surface
Implementation Method 2
the light-emitting element and the heat-conducting member have microscopic surface irregularities, which form a relatively large gap therebetween when they are brought into contact with each other
Implementation Method 3
a light-transmissive plate-shaped heat-conducting member thermally connected to a wavelength-converting member to reduce the heat generated by the wavelength-converting member
Data Source
AI summary
A headlamp (1) includes a semiconductor laser (3); a light-emitting element (7) that emits light in response to laser light emitted from the semiconductor laser (3); a heat-conducting member (13) that receives heat generated by the light-emitting element (7) through a light-emitting-element facing surface (13a); and a gap layer (15) that is disposed between the light-emitting element (7) and the light-emitting-element facing surface (13a) and that conducts the heat generated by the light-emitting element (7) to the light-emitting-element facing surface (13a). The gap layer (15) contains at least an inorganic amorphous material.