Light Source Device with Segmented Fluorescent Layer for Thermal Management
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Solution Overview
Problem
Existing light source devices face challenges in increasing luminance without degrading light efficiency, particularly in projector systems where the fluorescence generation area becomes overheated, leading to reduced lifespan and efficiency.
Innovation Solution
A light source device comprising two excitation light generation sections with solid-state light sources and collimating lenses, an excitation light combining section, and a fluorescence generation section, where the excitation lights from both sections enter different areas of the fluorescence generation area, reducing thermal load and maintaining high light efficiency by using a polarization beam combiner and defocused light entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If excitation lights from two excitation light generation sections are combined and focused into a small fluorescence generation area, then luminance is increased, but the fluorescent layer becomes overheated and its lifespan is reduced
Solution Approach 1:
The fluorescence generation area is divided into multiple regions, with each excitation light generation section targeting a different region. This segmentation distributes the thermal load across multiple areas of the fluorescent layer, preventing overheating in any single location while maintaining high overall luminance output.
Solution Approach 2:
Different regions of the fluorescent layer are utilized by different excitation light generation sections, creating a local quality distribution where each region handles a specific portion of the thermal load. This allows the system to maintain high luminance while managing heat distribution effectively.
2Illumination intensity
If multiple solid-state light sources are used to increase luminance, then light intensity is improved, but the device complexity increases
Solution Approach 1:
The light source system is segmented into multiple independent excitation light generation sections, each with its own solid-state light sources and optical components. This modular segmentation allows for increased light intensity while managing complexity through standardized, repeatable units.
Solution Approach 2:
Multiple excitation light generation sections are merged into a single integrated system with coordinated control, combining the light output of multiple solid-state sources to achieve high luminance while maintaining a unified device structure.
3Use of energy by moving object
If excitation light is focused tightly to increase luminance, then light efficiency is improved, but the fluorescent layer burnout risk increases
Solution Approach 1:
The concentrated energy that would otherwise focus on a single point is segmented and distributed across multiple regions of the fluorescent layer. Each region receives focused excitation light for high efficiency, but the overall thermal burden is divided, preventing burnout and extending lifespan.
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 allows for increased luminance without degrading light efficiency, extends the lifespan of the fluorescent layer, and prevents burnout, enabling a more efficient and durable light source for projectors.
Implementation Method 1
a first solid-state light source array having a first solid-state light source adapted to generate a first excitation light
Implementation Method 2
a first collimating lens array having a first collimating lens disposed so as to correspond to the first solid-state light source, and adapted to roughly collimate the excitation light generated by the first solid-state light source
Implementation Method 3
the excitation light combining section transmits the first excitation light and reflects the second excitation light to thereby combine the first excitation light and the second excitation light with each other
Implementation Method 4
a fluorescence generation section located in a vicinity of the light collection position, and having a fluorescent layer adapted to generate a fluorescence from at least a part of the first excitation light and the second excitation light collected by the light collection optical system
Data Source
AI summary
A light source device 10 includes an excitation light generation section 20 having a solid-state light source array 22 having a solid-state light source 25 adapted to generate an excitation light, an excitation light generation section 30 having a solid-state light source array 32 having a solid-state light source 35 adapted to generate an excitation light, an excitation light combining section 50 adapted to combine the excitation light from the excitation light generation section 20 and the excitation light from “30” with each other, a light collection optical system 60 adapted to collect the excitation light at a predetermined light collection position, and a fluorescence generation section 70 having a fluorescent layer adapted to generate a fluorescence from at least a part of the excitation light collected by the light collection optical system 60.