Headlight Module Reflecting Surface Edge Configuration
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Solution Overview
Problem
Conventional headlight devices experience light distribution irregularity due to reflections from inclined surfaces, leading to uneven light patterns that fail to meet regulatory requirements for cutoff line distinctness and illuminance distribution.
Innovation Solution
A headlight module with a first light source and a first optical unit featuring a reflecting surface with edge parts positioned differently along the optical axis, where the second edge part is closer to the lens surface than the first edge part, reducing light distribution irregularity by optimizing the light projection and illuminance pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If an inclined surface is used to connect upper-side and lower-side surfaces of the light guide member, then the cutoff line can be formed, but light distribution irregularity occurs due to reflected light traveling in different directions
Solution Approach 1:
The reflecting surface is divided into multiple regions with different reflective properties. The first reflecting surface has a first reflective property and the second reflecting surface has a second reflective property, segmenting the reflection function to control light distribution in different areas and reduce irregularity.
Solution Approach 2:
Different regions of the reflecting surface are assigned different reflective properties. The first reflecting surface and second reflecting surface have distinct local qualities in terms of reflectivity, allowing precise control over light distribution characteristics in different zones to eliminate the uniformity problem.
2Shape
If a lightproof thin film is applied to the lower surface of the light guide member, then the cutoff line can be defined, but light distribution irregularity persists due to inclined surface reflections
Solution Approach 1:
The reflecting surface is segmented into multiple regions with different reflective properties. By dividing the reflection function across first and second reflecting surfaces with distinct properties, the system controls light distribution more uniformly while maintaining cutoff line distinctness.
Solution Approach 2:
Different local regions of the reflecting surface are given different reflective qualities. This allows the cutoff line to remain distinct while the overall light distribution becomes more uniform by compensating for the irregularities caused by inclined surface reflections.
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, ensuring a distinct cutoff line and appropriate illuminance distribution that meets regulatory standards, enhancing the safety and performance of the headlight system.
Implementation Method 1
a first optical surface that reflects the first light
Data Source
AI summary
A headlight module includes a first light source that emits first light, and a first optical unit. The first optical unit includes a first optical surface that reflects the first light, and a lens surface that projects illuminating light including the first light reflected by the first optical surface. An edge part of the first optical surface close to the lens surface includes a first edge part and a second edge part differing from each other in a position in a direction orthogonal to an optical axis of the lens surface, and a position of the second edge part in a direction of the optical axis is closer to the lens surface than a position of the first edge part in the direction of the optical axis.