Variable Thickness Light Conversion Element for Laser Lighting
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Solution Overview
Problem
Existing lighting devices with laser light sources fail to ensure consistent synchronization of optical parameters, such as color coordinates, across the spatial extent of the light spot, particularly with planar converters, and lack sufficient control over optical properties.
Innovation Solution
A lighting device with a light conversion element having a variable thickness on its primary and secondary light receiving/emitting surfaces, allowing for targeted adjustment of optical parameters by varying the thickness to achieve homogeneous color coordinates and high luminance, achieved through precise shaping and alignment of the converter material to the laser beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a planar light conversion element is used, then the device structure is simple and easy to manufacture, but the color coordinates are not constant over the spatial extent of the light spot
Solution Approach 1:
The light conversion element is designed with spatially varying thickness, where different regions have different thicknesses to locally adjust the conversion of primary light to secondary light. This ensures that color coordinates remain constant across the entire light spot area, with the thickest region positioned at the center of the light spot.
2Illumination intensity
If laser power is increased to achieve high luminance, then luminance increases, but power consumption increases
Solution Approach 1:
The thickness of the light conversion element is optimized to control the conversion efficiency of primary light to secondary light. By adjusting the thickness parameter, the device achieves high luminance with minimal laser power input, reducing power consumption while maintaining high illumination intensity.
3Illumination intensity
If the light spot diameter is reduced to increase luminance, then luminance increases, but the area of the light spot decreases
Solution Approach 1:
The light conversion element features a thickness distribution that is thickest at the center and decreases toward the edges, precisely matching the spatial profile of the light spot. This local variation in thickness ensures uniform color coordinates and high luminance concentration within a small light spot area.
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 enables synchronized optical properties within the light spot, achieving high luminance and power efficiency with low laser power consumption, suitable for applications like automotive, aviation, and medical lighting, while maintaining cost-effectiveness.
Implementation Method 1
The light conversion element serves for the purpose of absorbing the light of the laser light source and to emit it again at another wavelength
Data Source
AI summary
A lighting device is provided that includes light emitting unit that emits primary light and a light conversion element that is illuminated with the primary light and emits secondary light of another wavelength. The light conversion element has a front side defining a primary light receiving surface that received the primary light and a secondary light emitting surface that emits the secondary light. The light conversion element has a variable thickness at the primary light receiving surface and/or in the secondary light emitting surface.