Projector Light Source With Graded Phosphor Density
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Solution Overview
Problem
The uniform density of fluorescence emission points in wavelength converting members leads to uneven absorption of excitation light, resulting in increased thermal quenching and decreased wavelength conversion efficiency near the light incident surface.
Innovation Solution
A light source apparatus with a wavelength converter having varying density of fluorescence emission points along the light incident direction, gradually increasing from the light incident surface to the opposite surface, to evenly distribute light absorption and reduce thermal quenching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the density of fluorescence emission points is uniform across the wavelength converting member, then the manufacturing process is simple, but the temperature near the light incident surface becomes too high causing thermal quenching and decreased wavelength conversion efficiency
Solution Approach 1:
The patent applies local quality by creating a non-uniform density distribution of fluorescence emission points within the wavelength converting member. The density is specifically designed to be lower near the light incident surface and higher in deeper regions, allowing each local region to have optimal properties for its specific function: the lower density region reduces heat generation near the incident surface, while the higher density region ensures sufficient light conversion in deeper areas.
Solution Approach 2:
The patent changes the physical parameter of phosphor density distribution from uniform to gradient-based. By varying the concentration or size of phosphor particles along the light propagation direction, the system optimizes both thermal management and conversion efficiency. This parameter change allows the material properties to adapt to the local conditions of light intensity and heat generation.
2Use of energy by moving object
If the density of fluorescence emission points increases near the light incident surface, then more excitation light is absorbed, but excessive heat is generated causing thermal quenching
Solution Approach 1:
The patent applies local quality by creating a non-uniform density distribution of fluorescence emission points within the wavelength converting member. The density is specifically designed to be lower near the light incident surface and higher in deeper regions, allowing each local region to have optimal properties for its specific function: the lower density region reduces heat generation near the incident surface, while the higher density region ensures sufficient light conversion in deeper areas.
Solution Approach 2:
The patent changes the physical parameter of phosphor density distribution from uniform to gradient-based. By varying the concentration or size of phosphor particles along the light propagation direction, the system optimizes both thermal management and conversion efficiency. This parameter change allows the material properties to adapt to the local conditions of light intensity and heat generation.
3Productivity
If the wavelength converting member has high phosphor density, then wavelength conversion efficiency is high, but thermal quenching increases and reduces overall efficiency
Solution Approach 1:
The patent applies local quality by creating a non-uniform density distribution of fluorescence emission points within the wavelength converting member. The density is specifically designed to be lower near the light incident surface and higher in deeper regions, allowing each local region to have optimal properties for its specific function: the lower density region reduces heat generation near the incident surface, while the higher density region ensures sufficient light conversion in deeper areas.
Solution Approach 2:
The patent changes the physical parameter of phosphor density distribution from uniform to gradient-based. By varying the concentration or size of phosphor particles along the light propagation direction, the system optimizes both thermal management and conversion efficiency. This parameter change allows the material properties to adapt to the local conditions of light intensity and heat generation.
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 design reduces variations in light absorption and heat generation, preventing excessive temperature increases and maintaining efficient wavelength conversion across the converter.
Implementation Method 1
a wavelength converter containing a phosphor and configured to convert the first light into second light having a second wavelength band different from the first wavelength band
Implementation Method 2
a wavelength converting member containing a phosphor that converts the excitation light into fluorescence
Implementation Method 3
a portion of the phosphor that is closer to the light incident surface on which the excitation light is incident absorbs a greater amount of the excitation light
Implementation Method 4
there is a concern about an increase in the amount of thermal quenching of the fluorescence in the portion of the wavelength converting member that is close to the light incident surface
Data Source
AI summary
A light source apparatus includes a light emitter configured to emit first light having a first wavelength band; and a wavelength converter containing a phosphor and configured to convert the first light into second light having a second wavelength band different from the first wavelength band and output the second light, the wavelength converter having a first surface on which the first light is incident, a second surface facing a side opposite the first surface, and a third surface which intersects with both the first and second surfaces and via which the second light exits, and a density of fluorescence emission points of the phosphor increasing along a direction from the first surface toward the second surface.