Motor Vehicle Headlight Laser Beam Overlap for Horizontal Resolution
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Solution Overview
Problem
Existing adaptive frontlighting systems for motor vehicles face challenges in achieving high resolution and quick reaction times without complex structures, often experiencing resolution issues, especially in the horizontal direction, and unwanted color effects at the edges of illuminated images generated by laser light sources.
Innovation Solution
The method involves directing laser beams from a second group of at least two laser light sources onto a light conversion means to generate superimposed horizontal light bands, with the first and second groups overlapping between 10 and 90% in height, controlled by beam deflection means, such as micromirrors, to create a high-resolution luminous image with adjustable spot geometry and intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single group of laser light sources is used to illuminate the light conversion means, then the structure is simpler, but the horizontal resolution is insufficient
Solution Approach 1:
The patent divides the laser light sources into at least two groups (first group and second group) that are spatially separated and directed at different positions on the light conversion means. This segmentation allows each group to contribute to different horizontal regions, thereby improving overall horizontal resolution without requiring excessive complexity in a single illumination path
2Illumination intensity
If laser beams are directly emitted to maximize luminance, then the light yield increases, but eye safety is compromised
Solution Approach 1:
The patent introduces a light conversion means (phosphor layer) as an intermediary between the laser light sources and the roadway. The laser beams first illuminate the phosphor layer, which converts the light to a broader spectrum, and only then is the converted light projected onto the roadway. This intermediary approach maintains high luminance while eliminating the direct emission of concentrated laser beams that could endanger eyes
3Ease of operation
If the beam deflection means is subjected to high specific surface load to deflect concentric laser beams, then the beam deflection capability is achieved, but the construction cost increases
Solution Approach 1:
The patent directs laser beams from different groups to different positions on the light conversion means, creating a distributed illumination pattern. This local quality approach reduces the specific surface load on any single point of the beam deflection means, as the load is spread across multiple locations, thereby reducing construction costs while maintaining beam deflection capability
4Adaptability or versatility
If segments of LED matrix are switched on or off to achieve adaptive illumination, then the adaptability is improved, but the resolution is limited to about 1.5 degrees
Solution Approach 1:
The patent transitions from the discrete segment switching approach of LED matrices to a continuous beam deflection approach using oscillating mirrors. By introducing the temporal dimension of mirror oscillation and the spatial dimension of continuous beam positioning, the system achieves much finer resolution beyond the 1.5-degree limitation of LED segments, while maintaining adaptability through dynamic control
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 results in a headlight system with improved horizontal resolution, minimized color effects, and high dynamics in light intensity, enabling adaptive and glare-free illumination with a compact structure.
Implementation Method 1
at least one laser light source, in particular in the form of a laser diode, which can be modulated
Implementation Method 2
the laser beam of which is directed via a beam deflection means controlled by a beam deflection controller onto a light conversion means
Data Source
Figure 1
Figure 2a~2c
Figure 3~4
AI summary
The invention relates to a headlight for motor vehicles comprising at least one modular laser light source (11 - 16), the laser beam thereof being directed, via beam deflection means (51, 52) which are controlled by a deflection control (9), to light conversion means (60), also comprising a projection system (70) for projecting the light image generated on the light conversion means to the road. A first group (1) of at least two laser light sources (11, 12, 13) for generating a first group of at least two superimposed, essentially horizontal light bands (61, 62, 63) on the light conversion means (60) and a second group (2) of at least two laser light sources (14, 15, 16) for generating a second group of at least two superimposed, essentially horizontal light bands (64, 65, 66) on the light conversion means (60) are provided. A laser control (3) is associated with the laser light sources (11 - 16), and the laser beams (11s - 16s) are directed by the laser deflection means (51, 52) to the light conversion means (60) such that light bands (61, 62, 63) of the first group (1) and light bands (64, 65, 66) of the second group overlap each other.