Headlight Light Guide Structure for Stepped Cutoff Lines
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Solution Overview
Problem
Conventional headlight devices struggle to form a cutoff line in a complicated shape, such as a stepped shape with a rising line, as required by road traffic regulations, while also offering increased design flexibility and minimizing chromatic aberration and blurring.
Innovation Solution
A headlight module comprising a light source, a condensing optical unit, and a light guide member with specific cutoff line formation parts that create distinct illuminance distribution patterns, allowing for the emission of light with a cutoff line in a desired shape, achieved through the combination of first and second emission surfaces that form combined illuminance distribution patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a light blocking plate or conventional light guide member is used, then the headlight device can achieve basic light distribution, but it cannot form a cutoff line in a complicated shape (e.g., stepped shape with rising line) as required by road traffic regulations
Solution Approach 1:
The light guide member is divided into multiple independent cutoff line formation parts (first cutoff line formation part and second cutoff line formation part), each capable of forming a specific portion of the cutoff line. This segmentation allows the complex stepped shape with rising line to be constructed from simpler individual elements, achieving the required complicated cutoff line shape while maintaining design flexibility
Solution Approach 2:
The invention introduces a vertical stacking dimension by arranging multiple cutoff line formation parts at different positions within the light guide member. The first and second cutoff line formation parts are positioned to create different portions of the cutoff line in the vertical direction, enabling the formation of a three-dimensional stepped shape that cannot be achieved with conventional two-dimensional light blocking structures
2Adaptability or versatility
If the opening is made vertically long to increase designability, then design freedom is improved, but chromatic aberration and blurring of the cutoff line increase
Solution Approach 1:
By segmenting the light guide member into multiple specialized cutoff line formation parts, each part can be optimized for its specific function. The first cutoff line formation part forms the lower portion of the cutoff line while the second forms the upper portion, allowing each segment to be precisely controlled to minimize chromatic aberration and blurring independently
Solution Approach 2:
Different regions of the light guide member are given different optical properties and structures. The first and second cutoff line formation parts have locally optimized characteristics tailored to their specific positions and functions, enabling the vertically long opening design to maintain cutoff line clarity by addressing optical quality issues locally rather than requiring a uniform design
3Device complexity
If a conventional light guide member with single emission surface is used, then the structure is simple, but it cannot form the combined illuminance distribution pattern required for complex light distribution
Solution Approach 1:
The light guide member is segmented into multiple emission surfaces (first emission surface and second emission surface), each associated with specific cutoff line formation parts. This segmentation enables different portions of light to be emitted and distributed independently, creating the combined illuminance distribution pattern required for complex light distribution while maintaining a relatively simple integrated structure
Solution Approach 2:
The light guide member is designed as a multi-functional component that simultaneously performs light guiding, light distribution, and cutoff line formation functions. By integrating multiple emission surfaces and cutoff line formation parts into a single structure, the device achieves complex light distribution capabilities without requiring multiple separate components, thus maintaining structural simplicity while enhancing versatility
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
Enables the emission of light with a cutoff line in a desired shape, enhancing designability and maintaining clarity and efficiency in light distribution, while adhering to regulatory requirements.
Implementation Method 1
a condensing optical unit that allows light generated by the light source to enter and transforms the light into condensed light
Implementation Method 2
a light guide member including a first cutoff line formation part that forms light in a first light distribution pattern from the condensed light, a second cutoff line formation part that forms light in a second light distribution pattern from the condensed light
Data Source
AI summary
A headlight module includes: a light source; a condensing optical unit that allows light generated by the light source to enter and transforms the light into condensed light; and a light guide member including a first cutoff line formation part that forms light in a first light distribution pattern from the condensed light, a second cutoff line formation part that forms light in a second light distribution pattern from the condensed light, a first emission surface that emits light in a first illuminance distribution pattern corresponding to the first light distribution pattern, and a second emission surface that emits light in a second illuminance distribution pattern corresponding to the second light distribution pattern. Light in a combined illuminance distribution pattern obtained by adding the light in the first illuminance distribution pattern and the light in the second illuminance distribution pattern is emitted.