Solid State Headlight with Selective Reflectivity Coatings
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Solution Overview
Problem
Solid state adaptive headlights generate stray light and glare due to issues like overheating and delamination, which affect the contrast and performance of the light distribution.
Innovation Solution
A high-contrast solid state headlight design featuring a light-emitting diode light source, an illumination micro-lens, a projection micro-lens, a collimating optic, a metal layer with an aperture, and high- and low-reflectivity coatings to manage light reflection and reduce stray light, with the high-reflectivity coating facing the illumination side and the low-reflectivity coating facing the projection side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If solid state headlights are used to control light distribution, then lighting efficiency is improved, but stray light and glare are generated
Solution Approach 1:
The patent applies local quality by implementing different reflectivity characteristics in different regions of the headlight system. Specifically, the illumination lens has a first region with high reflectivity (≥80%) and a second region with low reflectivity (≤20%), allowing each region to perform its specialized function optimally
Solution Approach 2:
The headlight system is segmented into distinct functional zones: a high-reflectivity region for light collection and redirection, a low-reflectivity region for glare reduction, and a metal aperture layer with selective transmission. This segmentation allows independent optimization of each zone to resolve the contradiction between efficiency and stray light generation
2Use of energy by moving object
If solid state headlights are used to control light distribution, then lighting control is improved, but overheating and delamination occur
Solution Approach 1:
The patent converts the harmful effect of light absorption (which causes overheating) into a beneficial function. The high-reflectivity coating (≥80%) reflects most incident light back toward the LED source, converting potential heat-generating absorption into useful light redirection, thereby reducing thermal accumulation and preventing delamination
Solution Approach 2:
The patent changes the optical parameters of the illumination lens by applying coatings with specific reflectivity values. The high-reflectivity coating (≥80%) and low-reflectivity coating (≤20%) fundamentally alter how light interacts with the lens, enabling thermal management through optical design rather than thermal dissipation structures
3Temperature
If high reflectivity coating is applied to reduce heat accumulation, then heat management is improved, but light distribution control may be affected
Solution Approach 1:
The illumination lens is segmented into a first region with high reflectivity coating for heat management and a second region with low reflectivity coating for light distribution control. This spatial segmentation allows simultaneous optimization of thermal management and optical performance without compromise
Solution Approach 2:
Different regions of the illumination lens are assigned different reflectivity qualities: the first region has high reflectivity (≥80%) for reflecting light back to reduce heat, while the second region has low reflectivity (≤20%) for allowing light transmission and maintaining proper light distribution patterns
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 reduces heat accumulation and stray light, improving the contrast and durability of the headlight by optimizing light reflection and absorption, thereby minimizing glare and enhancing the overall performance.
Implementation Method 1
a high-reflectivity coating positioned between the metal layer and the illumination micro-lens, the high-reflectivity coating having a reflectivity of at least about 80%
Implementation Method 2
a low-reflectivity coating positioned between the metal layer and the projection micro-lens, the low-reflectivity coating having a reflectivity of at most about 20%
Implementation Method 3
a collimating optic positioned between the light-emitting diode light source and the illumination micro-lens
Implementation Method 4
an illumination micro-lens; a projection micro-lens
Data Source
AI summary
A solid state headlight comprises: a light-emitting diode light source; an illumination micro-lens; a projection micro-lens; a collimating optic positioned between the light-emitting diode light source and the illumination micro-lens; a metal layer positioned between the illumination micro-lens and the projection micro-lens, the metal layer having an aperture; a high-reflectivity coating positioned between the metal layer and the illumination micro-lens, the high-reflectivity coating having a reflectivity of at least about 80%; and a low-reflectivity coating positioned between the metal layer and the projection micro-lens, the low-reflectivity coating having a reflectivity of at most about 20%.