Headlight Shield Light Windows for Beam Mixing
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Solution Overview
Problem
Existing motor vehicle headlight lighting units do not allow for targeted mixing or overlapping of light beams from top and bottom light chambers, limiting the control over the light-dark boundary and resulting in shadowy bands in high beam functions, which can impair visibility and increase accident risk.
Innovation Solution
A lighting unit with a panel having a reflective surface and multiple screen sections with light windows, allowing for targeted manipulation of light paths to overlap light distributions from top and bottom light chambers, ensuring a sharp light-dark boundary and minimizing shadowy bands, while enabling efficient light emission for traffic signs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single diaphragm extending to the focal plane is used to generate a sharp light-dark boundary, then the light-dark boundary sharpness is improved, but the ability to mix light beams from top and bottom light chambers is lost
Solution Approach 1:
The diaphragm is divided into multiple screen sections (first screen section, second screen section, third screen section) with light windows between them. This segmentation allows different portions of the diaphragm to perform different functions: some sections create the sharp light-dark boundary while others allow light beams to pass through for mixing, thus resolving the contradiction between boundary sharpness and beam mixing capability.
2Manufacturing precision
If separate light chambers are used for low beam and high beam functions, then the light pattern control is improved, but shadowy bands appear in the high beam function
Solution Approach 1:
Light windows act as intermediaries between the bottom light chamber and the projection lens. These light windows allow light beams from the bottom light chamber to pass through and overlap with light from the top light chamber, eliminating shadowy bands in the high beam function while maintaining proper light pattern control through the screen sections.
3Reliability
If a rigid panel structure is used for the diaphragm, then the construction robustness is improved, but the targeted manipulation of light paths is limited
Solution Approach 1:
The rigid panel is segmented into multiple screen sections with light windows, allowing each section to be independently optimized for specific light path manipulation while maintaining the overall robustness of the rigid construction. This enables targeted influencing of the light image without compromising structural reliability.
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 solution enables targeted mixing of light beams, maintaining a sharp light-dark boundary for low beam functions and minimizing shadowy bands in high beam functions, enhancing visibility and compliance with legal light patterns, and improving the overall efficiency and robustness of the headlight system.
Implementation Method 1
The panel has at least partially a reflective surface. As a result, the efficiency of the headlight system can be additionally increased in that light reflected at the screen, which would otherwise be absorbed at the screen, can be introduced into the projection lens
Implementation Method 2
a projection lens (5) with an optical axis (A), with a light chamber (3a) on a top side and a light chamber (3b) on a bottom side the diaphragm (4) is arranged
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A lighting unit for a headlight, in particular a motor vehicle headlight, having at least two light sources (1a, 1b), at least one reflector (2a, 2b), which delimits two light chambers (3a, 3b), a bezel (4), and a projection lens (5) having an optical axis (A), wherein a light chamber (3a) is arranged on an upper side and a light chamber (3b) is arranged on an underside of the bezel (4), wherein at least one light source (1a, 1b) is arranged within each of the light chambers (3a, 3b) and the bezel (4) extends substantially as far as a focal plane (E) of the projection lens (5) in order to produce a sharp light/dark boundary in a light exposure produced by the lighting unit, wherein the bezel (4) has at least one light window (7a, 7b), wherein at least one light path (8a, 8b, 8c, 8d) extends outwardly from a light chamber (3a, 3b), through the at least one light window (7a, 7b) and through the projection lens (5).