Headlight Light-Guiding Structure for Sign Light Without Scatter
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Solution Overview
Problem
Existing illumination devices for motor vehicle headlights face challenges in controlling light distribution, leading to undesired optical effects such as scattered light, particularly in the region of the HV line, when producing sign light distributions.
Innovation Solution
The illumination device incorporates a first deflection structure within the light-guiding body to totally reflect light from the light source, directing it to a second deflection structure on the upper boundary surface, which then deflects the light into a specific region of the projection device to create a sign light distribution above the cut-off line, optimizing control and reducing scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light is used to produce sign light distribution by exiting the light-permeable body directly or after re-entering, then sign light distribution can be produced, but scattered light occurs leading to undesired optical effects
Solution Approach 1:
The light-permeable body is segmented into distinct functional regions: a first region for front area light/dipped beam, a second region for sign light, and a third region for additional light distribution. This segmentation allows each region to be optimized independently, with the second region specifically designed to guide sign light through the light-permeable body to the projection device without scattering, while the first region handles conventional lighting functions.
Solution Approach 2:
Different regions of the light-permeable body are assigned different optical properties and functions. The second region has specific light-guiding properties that enable controlled light transmission for sign light, while other regions are optimized for their respective functions. This local differentiation allows sign light to be produced with controlled directionality and minimal scattering.
2Adaptability or versatility
If modifications are made to the light-permeable body, light injection element or projection device to produce sign light, then sign light distribution is achieved, but control of exiting light becomes difficult
Solution Approach 1:
The illumination device is divided into functionally independent modules: a light source unit, a light-permeable body with segmented regions, and a projection device. The second region of the light-permeable body specifically guides light from the light source to the projection device, allowing independent optimization and control of each module without affecting the others.
Solution Approach 2:
The second region of the light-permeable body acts as an intermediary optical element that receives light from the light source and directs it to the projection device. This intermediary structure provides controlled light transmission and enables precise control of the sign light distribution pattern without requiring direct modification of the projection device itself.
3Adaptability or versatility
If light for sign light distribution exits the light-permeable body before projection, then sign light can be produced, but excessive light in the HV line region occurs
Solution Approach 1:
The light-permeable body is segmented into a first region for front area light/dipped beam and a second region for sign light, with distinct light paths. The second region is specifically configured to guide light to the projection device, ensuring that sign light is projected only in the intended region above the cut-off line and does not contribute to excessive light in the HV line region.
Solution Approach 2:
The sign light function is extracted as a separate, independent light path through the second region of the light-permeable body. This extracted light path is specifically optimized for sign light projection and is separated from the conventional front area light and dipped beam paths, allowing independent control and preventing interference with the HV line region illumination.
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
This approach allows for controlled production of sign light distribution without affecting the front area light or dipped beam distribution, minimizing scattered light and enabling precise adaptation to desired requirements.
Implementation Method 1
a first deflection structure, which is designed in such a way that light from the at least one light source which enters the light injection element and strikes the deflection structure is totally reflected
Implementation Method 2
the second deflection structure is designed in such a way that the light striking it is deflected as a fourth light beam to a first surface region of the first lower boundary surface
Data Source
AI summary
An illumination device for a motor vehicle headlight for producing light distribution with a cut-off line. The device includes a light-permeable body, a light injection element and a light source, wherein the light injection element is designed to inject light emitted by the light source into the light-permeable body. The light injection element has a first deflection structure, which is configured such that light from the light source which enters the light injection element and strikes the deflection structure is totally reflected. The totally reflected light is directed at a second deflection structure which is arranged on an upper boundary surface of the light-guiding body and configured such that the light striking it is deflected to a first surface region of a first lower boundary surface of a screen device. The surface region deflects the light striking it into a region of the projection device, which projects the light as a sign light light beam into a region of the light distribution located above the cut-off line as additional light distribution, e.g., as sign light light distribution.