Headlight Module Segmented Optical Surface for Uniform Illumination
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Solution Overview
Problem
Conventional headlight devices suffer from light distribution irregularities due to the luminance irregularities of the light source, which are directly projected onto the light distribution pattern, leading to reduced driver visibility and compliance with road traffic rules.
Innovation Solution
A headlight module with a segmented optical surface, where light from a solid-state light source is incident on segments with different optical powers, superposing multiple images to reduce contour line discontinuities and inhibit aberration, thereby forming a high luminosity region with reduced light distribution irregularity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a convex lens is used to form a light source image and project it forward, then a high luminosity region can be generated in the vicinity of the cutoff line, but luminance irregularity of the light source is directly projected as illuminance irregularity in the light distribution pattern
Solution Approach 1:
The optical system is divided into multiple segments: a first optical element with a first refractive index and a second optical element with a second refractive index different from the first. This segmentation allows different regions of the light distribution pattern to be controlled independently, enabling the formation of a high luminosity region near the cutoff line while maintaining uniformity in other areas by compensating for light source irregularities through the combined optical effects of the segmented elements.
2Device complexity
If a single optical element is used to form the light distribution pattern, then the device complexity is reduced, but the ability to control light distribution uniformity and reduce aberration is limited
Solution Approach 1:
Different optical elements are positioned at different locations relative to the light source and cutoff line, with each element having specific optical properties tailored to its location. The first optical element primarily controls the high luminosity region near the cutoff line, while the second optical element controls other regions of the light distribution pattern. This local quality approach allows precise control of light distribution uniformity in different areas without requiring a single complex optical element.
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 light distribution irregularity, enhancing driver visibility and compliance with road traffic rules by creating a distinct and uniform light distribution pattern with improved illuminance and reduced glare.
Implementation Method 1
a light distribution control element configured to form a light distribution pattern by changing a divergence angle of the light incident therein
Implementation Method 2
a projection optical element configured to project the light distribution pattern
Data Source
AI summary
A headlight module includes a light source, a light distribution control element and a projection optical element. The light source emits light. The light distribution control element forms a light distribution pattern by changing a divergence angle of the light incident therein. The projection optical element projects the light distribution pattern. The light distribution control element includes a first light distribution formation part configured to form a high luminosity region in the light distribution pattern and a second light distribution formation part configured to form a low luminosity region in the light distribution pattern. The low luminosity region is lower in luminosity than the high luminosity region.