Headlight Module Light Guide Superposition for Cutoff Illuminance
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Solution Overview
Problem
Existing headlight devices face challenges in forming a high luminous intensity region near the cutoff line while maintaining high light use efficiency and manufacturability, and in achieving a consistent light distribution pattern without varying the design when switching between low and high beam lighting states.
Innovation Solution
A headlight module that includes a first light source and an optical element with a reflecting surface, where part of the reflected light is superposed with unreflected light to form a high luminous intensity region, and the light distribution pattern is projected without using a shade, thereby improving light use efficiency and manufacturability, and allowing for a single module to produce both low and high beam patterns without design variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a shade is disposed at the tip of an optical fiber to form a cutoff line, then a sharp cutoff line is formed, but the illuminance distribution has high uniformity making it difficult to form a high illuminance region near the cutoff line
Solution Approach 1:
The patent divides the optical fiber into multiple segments: a first optical fiber for the high illuminance region and a second optical fiber for other regions. This segmentation allows independent optimization of each fiber's characteristics, enabling the first fiber to form a high illuminance region near the cutoff line while the second fiber maintains overall uniform illuminance distribution.
Solution Approach 2:
The patent applies different properties to different parts of the optical system. The first optical fiber has specific characteristics (length, position, light source intensity) optimized for creating a high illuminance region, while the second optical fiber is optimized for maintaining uniform illuminance. This local quality differentiation resolves the contradiction between forming a high illuminance region and maintaining overall uniformity.
2Illumination intensity
If multiple optical fibers and shades are used to create complex light distribution patterns, then the light distribution pattern can be controlled, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the functions of multiple optical fibers and shades into a simplified configuration. Instead of using multiple separate optical fibers with individual shades, the invention uses a coordinated system of two optical fibers where the first fiber creates the high illuminance region and the second fiber fills in other areas, eliminating the need for multiple shades and reducing overall device complexity.
Solution Approach 2:
The second optical fiber serves multiple functions: it provides illuminance for regions other than the high illuminance region, and it helps maintain overall uniform illuminance distribution. This multi-functionality reduces the need for additional specialized components, thereby reducing device complexity while maintaining light distribution control.
3Ease of manufacture
If a single optical fiber is used with uniform light distribution, then the manufacturing is simplified, but it is difficult to form a high illuminance region near the cutoff line
Solution Approach 1:
The patent segments the single optical fiber system into two separate optical fibers with different characteristics. The first optical fiber is specifically designed and positioned to create a high illuminance region near the cutoff line, while the second optical fiber maintains overall uniform illuminance. This segmentation allows the system to achieve both manufacturing simplicity and high illuminance region formation.
Solution Approach 2:
The patent changes key parameters of the optical fiber system: the first optical fiber has different length, position, and light source intensity characteristics compared to the second optical fiber. By adjusting these parameters, the system achieves high illuminance near the cutoff line while maintaining overall manufacturing simplicity and uniform illuminance distribution.
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 headlight module effectively forms a high luminous intensity region near the cutoff line, enhances light use efficiency, and simplifies the manufacturing process by eliminating the need for shades and complex optical systems, while maintaining consistent light distribution across different beam states.
Implementation Method 1
an optical element including a reflecting surface for reflecting the first light and a first light guide portion for guiding the first light reflected by the reflecting surface
Implementation Method 2
a part of the first light that has been reflected by the reflecting surface and another part of the first light that has not been reflected by the reflecting surface are superposed to form a high luminous intensity region
Data Source
AI summary
A headlight module for projecting a light distribution pattern includes: a first source for emitting first light; a second source for emitting second light; an element including a first guide for guiding the first light and a second guide for guiding the second light; and a condensing element for concentrating the second light. An emitting surface of the element includes first and second regions. The first light is emitted from the regions. The second light is emitted from the second region. The second region side of the second guide is connected to the first guide. The first light guided by the first guide enters the second guide. The pattern includes a pattern formed at a light concentration position of the condensing element. The second guide includes an incident surface. A focal position of the emitting surface and a focal position of the incident surface coincide with the light concentration position.