Laser Headlight Movable Light Deflector Color Consistency
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Solution Overview
Problem
Existing laser headlight systems with scanners exhibit unwanted color variation in light distribution due to differences in the angle of incidence on the phosphor, leading to undesirable color changes as the light beam moves, which affects the perceived light color in different directions.
Innovation Solution
The laser headlight design ensures that the light directed onto the phosphor impinges from a consistent direction of incidence across the scanning area, using a converging lens to align the laser light in parallel, thereby minimizing the angular variation of incidence and maintaining consistent emission characteristics, thus reducing color variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a movable light deflection element (scanner) is used to illuminate different partial areas of the phosphor, then the light distribution can be dynamically adjusted to changing traffic conditions, but the light color changes depending on the direction due to varying angles of incidence on the phosphor
Solution Approach 1:
A second light deflection element is introduced as an intermediary between the first light deflection element and the phosphor. This second element compensates for the varying angles of incidence by introducing an opposite angular deviation, ensuring that the light always strikes the phosphor at the same angle (e.g., perpendicular incidence) regardless of the scanning direction, thus maintaining consistent light color while preserving dynamic light distribution adjustment
Solution Approach 2:
The system dynamically adjusts the angular parameters of the light deflection elements. The second light deflection element is controlled to change its deflection angle in opposition to the first element, thereby maintaining a constant angle of incidence on the phosphor while allowing the beam direction to vary for different scanning positions, resolving the contradiction between adaptability and color stability
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 uniform light color across the scan area, eliminating the undesirable directional dependency of light color and enhancing the stability of the light distribution, which is essential for optimal illumination and safety in dynamic traffic conditions.
Implementation Method 1
a focused laser beam from a laser, which emits blue light
Implementation Method 2
a phosphor (e.g. a phosphor), which converts the blue light from the laser into white mixed light by mixing it with yellow or yellow-red fluorescent light
Implementation Method 3
a light deflection device which is set up to illuminate different partial areas of the phosphor with laser light at different times, the light deflection device having at least one movable first light deflection element which is set up for this purpose directing incident laser light in different spatial directions
Data Source
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AI summary
The invention relates to a laser headlight with a laser light source, a luminescent material, and a light-deflecting device which illuminates different sub-regions of the luminescent material with laser light at different times, said light-deflecting device having a movable first light-deflecting element which directs incident laser light in different spatial directions at different times. The light-deflecting device deflects light oriented in a first spatial direction towards a first sub-region of the luminescent material in a first beam path and light oriented in a second spatial direction towards a second sub-region of the luminescent material in a second beam path. The headlight is characterized in that the headlight is designed to allow the light deflected towards the first sub-region and the light deflected towards the second sub-region to be incident as parallel as possible to each other.