Overlapping Heat Dissipation Fins for Phosphor Wheel Thermal Management
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Solution Overview
Problem
Existing phosphor wheels in projection-type display apparatuses face challenges with heat dissipation efficiency due to air resistance and noise issues, particularly with heat sinks designed to reduce air resistance but limiting surface area for effective heat dissipation.
Innovation Solution
A phosphor wheel design featuring a disc-like substrate with a phosphor layer and overlapping heat dissipation fins that enhance heat dissipation while minimizing air resistance and noise, by strategically arranging fins to overlap orthogonally and using a thermally conductive joining layer for efficient heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If heat dissipation fins are designed to reduce air resistance, then air resistance and noise are reduced, but the surface area for heat dissipation is limited
Solution Approach 1:
The patent transitions from conventional two-dimensional flat fins to three-dimensional overlapping fins that extend in multiple layers. The overlapping configuration creates a multi-layered structure where fins are arranged both radially and axially, effectively utilizing the third dimension (depth/height) to maximize heat dissipation surface area while maintaining a compact profile that reduces air resistance during rotation.
2Temperature
If heat dissipation efficiency is improved by increasing surface area, then heat dissipation efficiency is improved, but air resistance and noise increase
Solution Approach 1:
The heat dissipation structure is divided into multiple discrete overlapping fin segments rather than a single large surface. Each fin segment is optimized to balance heat dissipation contribution with air resistance minimization. The segmented overlapping arrangement allows heat to be dissipated through multiple surfaces while the gaps between segments reduce aerodynamic drag compared to a solid continuous structure.
3Temperature
If conventional heat dissipation structures are used, then heat dissipation is provided, but fluorescence conversion efficiency decreases due to thermal quenching
Solution Approach 1:
The overlapping fin structure creates extended heat dissipation pathways in the axial dimension, providing multiple thermal conduction routes from the phosphor layer through the substrate and into the heat dissipation fins. This multi-dimensional heat transfer architecture enhances cooling efficiency, maintaining lower operating temperatures that preserve fluorescence conversion efficiency by reducing thermal quenching effects.
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 improves heat dissipation efficiency, reduces air resistance and noise, and maintains high fluorescence conversion efficiency, thereby enhancing the performance and reliability of the phosphor wheel in projection-type display apparatuses.
Implementation Method 1
a phosphor layer formed on the substrate... configured to be excited by the excitation light and emit light having a second wavelength different from the first wavelength
Implementation Method 2
a plurality of heat dissipation fins overlapping with each other when viewed in a direction orthogonal to a surface of the substrate
Implementation Method 3
heat dissipation fins... improve the efficiency of heat dissipation from the phosphor wheel
Data Source
AI summary
An object of the present invention is to improve the efficiency of heat dissipation from a phosphor wheel while suppressing the air resistance and noise of the phosphor wheel during the driving of a light source apparatus. A phosphor wheel according to the present invention includes a disc-like substrate, a phosphor layer formed on the substrate, and a plurality of heat dissipation fins overlapping with each other when viewed in a direction orthogonal to a surface of the substrate.