Vehicle Lighting Fork Area Uniform Luminance
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Solution Overview
Problem
Existing vehicle lighting arrangements face issues with uniform luminance, particularly at the fork area, leading to uncontrollable light spots and dark spots due to inhomogeneities, which affect the aesthetic appeal and compliance with regulatory standards.
Innovation Solution
A wedge-shaped lighting body is integrated in the fork area, with sides adapted to the curvature and diameter of the light guides, leaving an air gap, and featuring toroidal emission points and imperfections like prisms to ensure even light distribution and compliance with regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a light guide is forked into two branches, then the desired contours can be achieved, but inhomogeneities in luminance occur especially in the beam splitting area
Solution Approach 1:
An air prism is introduced as an intermediary component in the fork area of the light guide. This air prism acts as a mediator that redirects light from one light guide branch to the other, ensuring that the luminance in the fork area matches the luminance in the remaining light guide sections, thus achieving uniform illumination while maintaining the desired contour shape.
2Illumination intensity
If an air prism is used to split the beam, then light distribution is improved, but efficiency is reduced by losses due to incomplete deflection of light
Solution Approach 1:
The air prism is designed with specific geometric parameters (refractive angles and dimensions) that are optimized to achieve complete or near-complete deflection of light at the fork area. By carefully selecting these parameters, the system maximizes light distribution while minimizing energy losses due to incomplete deflection.
3Illumination intensity
If the fork area is flattened, then light transmission is improved, but mechanical strength is reduced
Solution Approach 1:
The light guide is designed with local quality variations: the fork area is flattened only in the specific region where light transmission is critical, while other areas of the light guide maintain their original structural properties. This localized modification ensures improved light transmission in the fork area without compromising the overall mechanical strength of the light guide.
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 achieves uniform luminance and a pleasing appearance by optimizing light emission in the critical bifurcation area, ensuring compliance with legal standards like ECE, SAE, and CC, while maintaining mechanical strength and production feasibility.
Implementation Method 1
the light guides being designed to guide the light and to emit light due to imperfections provided on the insides of the light guides
Implementation Method 2
the beam is split by an air prism... the efficiency is reduced by losses due to the incomplete deflection of the light by 90° at the Air Prism
Implementation Method 3
a wedge-shaped lighting body is arranged in the fork, with two sides of the lighting body being adapted to the curvature and the diameter of the light guides and nestled against them while leaving an air gap
Data Source
Figure 1~2
Figure 3~6
Figure 7~8
AI summary
The lighting assembly (1) has light source (4) which supply light to light conductors (2,3) which are used for guiding the light. The light conductors are branched from the common light entrance surface (7) in a forking region (G). The inner sides of the light conductors are provided with impurities (6). The outer surfaces of the light conductors facing the region of forking portion are provided with toric radiation beads (8).