Automotive Headlamp Signlight Homogeneity via Diffused Optical Zone
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Solution Overview
Problem
The signlight beam in automotive headlamps is not very homogeneous due to the use of a folder that only allows a few rays to pass over the cut-off line, leading to uneven lighting for sign visibility without glare.
Innovation Solution
An automotive lighting device with a diaphragm element and a main optical element, where the second zone of the main optical element is treated for light diffusion, improving the homogeneity of the signlight beam, and utilizing a solid-state light source and a collimator for optimal optical behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a folder is used to separate low beam and signlight beams by allowing only a few rays to pass over the cut-off line, then the low beam and signlight beam separation is achieved, but the signlight beam homogeneity deteriorates
Solution Approach 1:
The main optical element is divided into a first zone and a second zone with different optical functions. The first zone projects the low beam pattern while the second zone projects the signlight pattern with light diffusion treatment. This local differentiation allows each zone to optimize its specific function, resolving the contradiction between beam separation and signlight homogeneity.
Solution Approach 2:
A diaphragm element is introduced as an intermediary component to reflect part of the low beam and signlight beam. This mediator enables controlled beam separation while allowing the main optical element to focus on optimizing signlight homogeneity through its light diffusion treatment in the second zone.
2Illumination intensity
If the second zone of the main optical element is treated for light diffusion, then the signlight beam homogeneity is improved, but the device complexity increases
Solution Approach 1:
The light diffusion treatment is applied specifically to the second zone of the main optical element rather than the entire element. This localized treatment approach improves signlight homogeneity while minimizing the increase in device complexity by treating only the necessary portion.
Solution Approach 2:
The light diffusion function is integrated directly into the second zone of the main optical element, merging the diffusion function with the existing optical structure. This eliminates the need for separate diffusion components, thereby improving signlight homogeneity without proportionally increasing device complexity.
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 a more homogeneous signlight beam pattern, enhancing visibility for signs without glare, and is easily applicable to existing lighting devices with minimal modifications.
Implementation Method 1
a diaphragm element with a front edge, the diaphragm element being arranged for receiving and reflecting at least part of the low beam and the signlight beam
Implementation Method 2
at least part of the second zone of the main optical element is treated to provide light diffusion
Data Source
AI summary
An automotive lighting device includes a low beam light source, adapted for emitting a low beam and a signlight beam, a diaphragm element and a main optical element. The main optical element includes a first zone and a second zone. The first zone is suitable for receiving a part of the low beam which has not been reflected by the diaphragm element and projecting a low beam pattern and the second zone is suitable for receiving a part of the signlight beam which has not been reflected by the diaphragm element and projecting a signlight pattern. At least part of the second zone of the main optical element is treated to provide light diffusion.