Phosphor Wheel Convex Substrate Heat Dissipation
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Solution Overview
Problem
In illumination apparatuses, phosphor substrates generate excessive heat due to high-energy excitation light, leading to reduced light-emitting efficiency as a result of temperature quenching, necessitating effective heat dissipation methods.
Innovation Solution
A phosphor wheel with a disk-shaped substrate made of a heat conductive material, featuring a phosphor ring on one surface and convex portions on the opposing surface, which rotates to enhance air flow and heat exchange, thereby reducing thermal resistance and dissipating heat efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-energy excitation light is used to illuminate the phosphor substrate, then the light-emitting intensity is improved, but the temperature of the phosphor increases excessively causing temperature quenching and reduced light-emitting efficiency
Solution Approach 1:
The phosphor substrate is divided into multiple independent phosphor particles rather than using a continuous phosphor layer. This segmentation increases the surface area for heat dissipation and reduces heat accumulation in any single region, allowing high-energy excitation light to be used without excessive temperature rise.
Solution Approach 2:
The invention introduces a vertical dimension for heat dissipation by forming convex portions on the back surface of the substrate that extend toward the phosphor layer. This three-dimensional heat dissipation structure creates additional thermal pathways from the phosphor particles through the convex portions to the substrate back surface, effectively reducing phosphor temperature while maintaining high light-emitting intensity.
2Device complexity
If a flat phosphor substrate is used, then the structure is simple, but the heat dissipation efficiency is insufficient leading to temperature quenching
Solution Approach 1:
Convex portions are formed on the back surface of the substrate, creating curved surfaces that increase the surface area for heat dissipation. These convex portions extend upward toward the phosphor layer, creating efficient thermal pathways while maintaining relatively simple manufacturing processes. The curved geometry enhances heat transfer from the phosphor particles to the substrate and subsequently to the cooling air.
3Loss of energy
If the substrate surface area for air contact is increased, then the heat dissipation efficiency is improved, but the device complexity increases
Solution Approach 1:
Instead of increasing the overall substrate surface area uniformly, convex portions are locally formed only in specific regions on the back surface of the substrate. These localized convex structures are positioned to optimize heat dissipation from the phosphor particles while minimizing the overall increase in device complexity. The convex portions create turbulent air flow patterns that enhance heat transfer efficiency without requiring a completely redesigned substrate.
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 phosphor wheel effectively suppresses the temperature of the phosphor, maintaining light-emitting efficiency by reducing thermal resistance and enhancing heat dissipation, with the convex portions increasing the surface area for air contact and turbulent flow, achieving a 9-10% decrease in phosphor temperature compared to a flat plate.
Implementation Method 1
a phosphor that emits light by irradiation with excitation light
Implementation Method 2
a disk-shaped substrate made of a heat conductive material
Implementation Method 3
the substrate is driven to rotate about an axis of rotation
Data Source
AI summary
A disk-shaped substrate made of a heat conductive material is provided with, along an outer periphery of one surface of the substrate, a ring-shaped phosphor that emits light by irradiation with blue laser light that is excitation light. The substrate is provided with, on another surface of the substrate, a plurality of convex portions dotting a region corresponding to a region provided with the phosphor. In a phosphor wheel, the substrate is driven by a motor to rotate about an axis of rotation.