Vehicle Headlamp Laser Phosphor Illumination System
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Solution Overview
Problem
Existing vehicle headlamp technologies face challenges in improving the visibility of information loaded in illumination light, particularly due to limitations in laser light output, color visibility, and the coincidence of visible and infrared light projection regions.
Innovation Solution
An illuminating apparatus is designed with a first light source emitting excitation light, a light emitting section containing phosphors, a second light source emitting visible or infrared light with a different spectrum, and a light projection system that projects combined light from both sources to enhance information visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If laser light is used to project information onto the road surface, then information can be transmitted, but the visibility of the information is insufficient and laser safety regulations limit output power
Solution Approach 1:
The patent combines a laser light source (for information projection) with a white light source (for illumination) into a single headlamp system. The laser light and white light are merged and projected together onto the road surface, allowing information to be transmitted alongside illumination without requiring separate systems, thereby improving visibility while maintaining safety regulations.
Solution Approach 2:
The patent utilizes the characteristic color of laser light (e.g., green laser) to create high-visibility information patterns on the road surface. By leveraging the distinct wavelength and color properties of laser light, the system achieves superior visibility for transmitted information compared to conventional white light alone, while staying within safety power limits.
2Adaptability or versatility
If the projection region of visible light and infrared light coincide, then both types of light can be emitted, but the visibility of infrared light as information is compromised
Solution Approach 1:
The patent segments the projection system into distinct visible light and infrared light paths. By separating the projection regions or using different optical paths for visible and infrared light, the system maintains the ability to emit both types of light while ensuring that infrared light carrying information can be distinguished and detected without being obscured by the visible light projection.
3Loss of information
If a laser projector radiates collimated laser light to the road surface, then information can be projected, but safety concerns arise from concentrated laser radiation
Solution Approach 1:
The patent merges laser light with diffuse white light in the projection path. This combination disperses the concentrated laser energy by mixing it with the broader white light spectrum, reducing the harmful effects of concentrated collimated laser radiation while preserving the information-carrying capabilities of the laser component.
Solution Approach 2:
The patent introduces white light as an intermediary substance that mediates between the laser light source and the road surface. This intermediary diffuse light reduces the direct concentration of laser energy on the road surface and surrounding areas, thereby mitigating safety concerns while allowing laser-based information projection to continue.
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 apparatus improves the visibility and safety of information projected onto the road surface by using visible laser light with high contrast and controlled irradiation patterns, enhancing both driver and pedestrian safety without affecting the luminance distribution of the white light base.
Implementation Method 1
a light emitting section that emits light by being irradiated with the first light
Implementation Method 2
a second light source that emits second light which is infrared light or visible light having a different spectrum from an emission spectrum of light emitted from the light emitting section by being irradiated with the first light
Data Source
AI summary
An illuminating apparatus includes a first light source that emits blue laser light, a light emitting section that emits light by being irradiated with the blue laser light, a second light source that emits green laser light, a biaxial MEMS scanner that irradiates a part of the light emitting section with the green laser light, and a convex lens that projects the light emitted from the light emitting section to the outside.