Photoconversion Optics With Curved Phosphor for High Directivity
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Solution Overview
Problem
Conventional light source devices convert monochromatic excitation light to fluorescence with lower intensity due to a smaller illuminating area on the phosphor surface, resulting in compromised light intensity and directivity.
Innovation Solution
A photoconversion device comprising a holder, a wavelength converter with a protruding incident surface section, and an optical element that focuses fluorescence onto a predetermined direction, increasing the illuminating area and enhancing light intensity and directivity by using a reflector or lens to direct the fluorescence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional flat phosphor surface is used, then the device structure is simple, but the illuminating area is small resulting in low light intensity
Solution Approach 1:
The phosphor layer is formed with a convex curved surface instead of a flat surface. This curvature allows the excitation light to illuminate a larger area of the phosphor, increasing the fluoresce emission area and thereby improving the light intensity without adding complex mechanical structures
2Illumination intensity
If the illuminating area on the phosphor surface is increased, then the light intensity improves, but the width or distance from the focal point must be increased
Solution Approach 1:
The convex curved surface of the phosphor layer allows excitation light to spread over a larger area while maintaining a compact distance from the focal point. The curvature geometry enables increased illuminating area without proportionally increasing the distance from the light source
Solution Approach 2:
Instead of increasing the illuminating area by moving the phosphor farther from the focal point (one-dimensional solution), the invention uses the third dimension by creating a convex curved surface. This allows the light to cover a larger area through spatial distribution on the curved surface while maintaining a compact focal distance
3Illumination intensity
If the phosphor portion is made larger to increase illuminating area, then the light intensity improves, but heat-related issues and aberration increase
Solution Approach 1:
The convex curved surface concentrates the phosphor material in a compact volume closer to the focal point, reducing the overall size of the phosphor portion. This compact arrangement improves heat dissipation and reduces aberration while still providing a large illuminating area through the curved geometry
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 the emission of fluorescence with high directivity and high light intensity by expanding the illuminating area without increasing the width or distance from the focal point, reducing aberration and heat-related issues in the phosphor portion.
Implementation Method 1
the wavelength converter includes an incident surface section including a protruding surface to receive the excitation light from the output portion and emits fluorescence in response to the excitation light incident on the incident surface section
Implementation Method 2
The optical element includes a focusing element that focuses the fluorescence emitted by the wavelength converter onto a focusing plane
Data Source
AI summary
A photoconversion device includes a holder, a wavelength converter, and an optical element. The holder holds an output portion that outputs excitation light. The wavelength converter includes an incident surface section including a protruding surface to receive the excitation light from the output portion and emits fluorescence in response to the excitation light incident on the incident surface section. The optical element includes a focal point surrounded by the incident surface to direct the fluorescence emitted by the wavelength converter in a predetermined direction.