Rotating Fluorescent Member for Laser Lighting
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Solution Overview
Problem
Laser light irradiation causes degradation of phosphor particles in lighting devices, leading to reduced brightness and shortened lifespan due to high energy density and increased temperature, which in turn decreases luminous efficiency.
Innovation Solution
A lighting device with a rotating fluorescent member and a reflecting member to distribute laser light evenly across the phosphor particles, preventing continuous irradiation and improving heat dissipation, thereby maintaining luminous efficiency and extending device life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the phosphor is irradiated with laser light, then visible light is generated through fluorescence conversion, but the phosphor particles degrade due to high energy density, reducing brightness and device lifespan
Solution Approach 1:
The fluorescent member is rotated during operation, dynamically changing the irradiation position on the phosphor particles. This prevents any single location from receiving continuous high-energy laser irradiation, thereby reducing localized degradation while maintaining overall brightness output.
Solution Approach 2:
The rotation mechanism creates periodic movement of the laser irradiation spot across different regions of the fluorescent member. This periodic redistribution of energy exposure allows phosphor particles to recover between irradiation cycles, extending device lifespan while maintaining illumination intensity.
2Illumination intensity
If the phosphor is irradiated with laser light, then visible light is generated, but the phosphor temperature rises, decreasing luminous efficiency
Solution Approach 1:
By rotating the fluorescent member, the system dynamically distributes the heat-generating laser irradiation across multiple regions rather than concentrating it in one spot. This dynamic heat distribution prevents excessive temperature buildup, maintaining phosphor luminous efficiency.
Solution Approach 2:
The rotation mechanism extracts the heat concentration problem by removing the static irradiation spot and redistributing thermal energy across the fluorescent member surface, preventing localized overheating that would reduce luminous efficiency.
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 effectively prevents phosphor degradation and maintains luminous efficiency by rotating the fluorescent member to distribute laser light and improve heat dissipation, ensuring consistent illumination and extended device lifespan.
Implementation Method 1
a fluorescent member which is irradiated with laser light emitted by a laser generator and emits fluorescent light
Implementation Method 2
a reflecting member which reflects toward an outside fluorescent light emitted by the fluorescent member
Data Source
AI summary
Provided is a lighting device that can suppress decrease in its luminous efficiency and shortening of its life. A lighting device (1) includes a fluorescent member (4) which is irradiated with laser light emitted by a semiconductor laser (2) and emits fluorescent light, a rotation mechanism (6) which rotates the fluorescent member, and a reflecting member (7) which reflects the fluorescent light emitted by the fluorescent member toward the outside.