Wavelength Conversion Element Thermal Resistance Optimization
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Solution Overview
Problem
Existing light source devices with wavelength conversion layers face issues of temperature rise due to increased heat generation, leading to degradation and breakage of the phosphor, which affects conversion efficiency.
Innovation Solution
A wavelength conversion element is designed with a disk having a wavelength conversion layer and a reflecting layer, where the thermal resistance is optimized by positioning the wavelength conversion layer to minimize heat retention, allowing efficient heat release through careful placement and configuration to inhibit high temperature levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the excitation light is intensified to improve conversion efficiency, then the light output increases, but the heat generation in the phosphor increases causing temperature rise and potential degradation
Solution Approach 1:
The patent applies local quality by positioning the wavelength conversion layer at a specific radial location on the rotating disk where heat can be efficiently dissipated. The conversion layer is placed at a radius that optimizes the balance between light conversion and heat management, ensuring that the local thermal conditions are favorable even under intensified excitation light
Solution Approach 2:
The patent utilizes dynamics by rotating the disk containing the wavelength conversion layer. This rotation continuously changes the position of the conversion layer relative to the excitation light source and heat dissipation paths, preventing localized overheating and enabling more uniform heat distribution and dissipation across the disk surface
2Productivity
If the phosphor temperature rises due to heat generation, then conversion efficiency may improve initially, but degradation and breakage of the phosphor occur reducing reliability
Solution Approach 1:
The patent applies preliminary action by pre-positioning the wavelength conversion layer at an optimal radius on the rotating disk before operation begins. This predetermined position is calculated to ensure that during rotation, the conversion layer consistently operates in a thermal environment that prevents excessive temperature accumulation, thereby preventing degradation before it occurs
Solution Approach 2:
The patent converts the harmful effect of heat generation into a beneficial outcome by utilizing the rotation to actively manage heat dissipation. The rotational motion transforms the static heat accumulation problem into a dynamic heat management system where the continuous movement enables efficient heat distribution and prevents localized thermal damage to the phosphor
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
This configuration effectively prevents the wavelength conversion layer from reaching high temperatures, thereby preventing degradation and breakage, ensuring reliable operation of the light source device and projector.
Implementation Method 1
a reflecting layer disposed between the disk and the wavelength conversion layer, and adapted to reflect a light beam generated by the wavelength conversion layer
Implementation Method 2
a layer of phosphor for emitting light in response to reception of excitation light
Implementation Method 3
ρs (r): thermal resistance of thermal paths passing through inside and a surface of the disk between a point with the moving radius r on the first surface of the disk and an entire surface of the disk
Data Source
AI summary
A wavelength conversion element includes a disk, a wavelength conversion layer disposed above a first surface of the disk, and a reflecting layer disposed between the disk and the wavelength conversion layer, and Formula 1 is fulfilled.−dρw(r0)/dr<dρs(r0)/dr (Formula 1)where, assuming that a circular polar coordinate system having the rotational center as an origin is set on a plane parallel to the first surface of the disk,r: moving radius in the circular polar coordinate system,r0: radius of the disk,ρs(r): thermal resistance of thermal paths passing through inside and a surface of the disk between a point with the moving radius r on the first surface of the disk and an entire surface of the disk, andρw(r): thermal resistance of the wavelength conversion layer in a thickness direction of the wavelength conversion layer at the moving radius r.