Vehicle Headlight Light Guide Arrangement with Convex Rear Contour
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Solution Overview
Problem
Existing light guide arrangements for motor vehicle headlights often result in secondary light distributions being altered or adversely affected when light passes through, leading to undesirable effects on the lighting functionality, particularly in implementing wiping blinker functions.
Innovation Solution
The light guide arrangement is designed with the rear side of the light guide element and the light decoupling surface of the light guide body positioned at a normal distance from each other, with a convex circular contour for the light guide element and a concave circular contour for the light guide body, ensuring that light rays propagate at the same angle before and after exiting, maintaining the secondary light distributions and eliminating converging lens effects for a homogeneous luminous impression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the light guide body is arranged behind the light guide element to implement wiping blinker functionality, then the lighting function is enhanced, but the secondary light distribution is adversely affected due to light ray distortion
Solution Approach 1:
The light guide element is designed with a specific convex contour on its rear side that creates a localized optical property. This contour shape is optimized to preserve the angular propagation of light rays passing through it, ensuring that the secondary light distribution from the light guide body remains unchanged while still enabling the wiping blinker function.
Solution Approach 2:
The light guide element features an asymmetric design where the front side has a light decoupling surface and the rear side has a convex contour. This asymmetric structure allows the element to perform dual functions: decoupling light on the front while preserving ray angles on the rear, thereby resolving the contradiction between functional versatility and light distribution precision.
2Device complexity
If the light guide element and light guide body are positioned close together, then the device structure is compact, but the converging lens effect distorts the light output
Solution Approach 1:
Instead of trying to eliminate the converging lens effect through complex optical corrections, the invention inverts the approach by designing the light guide element's rear side with a convex contour that inherently counteracts the converging effect. This allows the light guide body to be positioned close to the light guide element without causing distortion, maintaining both structural compactness and homogeneous luminous impression.
3Use of energy by moving object
If the light guide element alters the light rays to improve coupling efficiency, then the light transmission is enhanced, but the secondary light distribution is changed
Solution Approach 1:
The invention changes the geometric parameter of the light guide element's rear side to a convex contour with specific radius of curvature. This parameter optimization allows the element to transmit light efficiently while preserving the angular distribution of light rays, thereby maintaining the secondary light distribution pattern without requiring complex optical corrections.
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 configuration maintains the integrity of secondary light distributions, allowing for uniform lighting and eliminating adverse effects on the light output, enabling the implementation of wiping flashing functions without altering the primary light distribution, thus enhancing the optical performance and functionality of motor vehicle headlights.
Implementation Method 1
light rays that propagate in the light-guiding body at an angle to a horizontal plane continue to propagate at this angle to the horizontal plane after exiting the light-guiding element
Implementation Method 2
The converging lens effect of the convex light-guiding element outer surfaces is eliminated or reduced by the concave light-emitting surface of the light-guiding body or bodies, so that a luminous impression that appears as homogeneous as possible is created on the light-emitting surface
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a light guide arrangement (100) for generating at least one lighting function and/or signaling function of a motor vehicle headlight or at least one lighting function and/or signaling function of a lighting device for a motor vehicle headlight, wherein the light guide arrangement (100) comprises an elongated light guide element (1) and at least one primary light source (10), wherein light from the primary light source (10) can be coupled into the light guide element (1) via at least one coupling area (2) at one end of the light guide element (1).The back side (4) of the light guide element (1) and the light output surface (11c) of the at least one light guide body (11) are spaced apart from each other and (i) the back side (4) of the light guide element (1) and the light output surface (11c) of the at least one light guide body (11) or (ii) the back side (4) and the light output surface (3a) of the light guide element (1) and the light output surface (11c) of the at least one light guide body (11) are aligned such that light rays (L1 - L8) propagating in the light guide body (11) at an angle to a horizontal plane (E) continue to propagate at this angle to the horizontal plane (E) after exiting the light guide element (1).