Vehicle Headlamp Fluorescence Efficiency via Incident Angle Optimization
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Solution Overview
Problem
Existing light emitting devices for vehicle headlamps do not effectively increase the use efficiency of fluorescence, leading to energy wastage and reduced light-emitting duration due to inefficient excitation light angles and section designs.
Innovation Solution
A light emitting device configuration that includes an excitation light source, a light emitting section with a Lambertian distribution of fluorescence, and a light projecting section, where the incident angle of the excitation light is optimized to reduce losses and enhance the control of fluorescence emission, with the light emitting section having a small thickness and a larger upper surface area to minimize lateral fluorescence and maximize forward projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the incident angle of excitation light is not optimized, then the device structure is simpler, but the use efficiency of fluorescence is reduced
Solution Approach 1:
The patent optimizes the incident angle of excitation light as a critical parameter to maximize fluorescence use efficiency. By changing the angular parameter of light incidence, the system achieves higher energy efficiency without adding complex structural components, directly resolving the contradiction between energy efficiency and device complexity.
2Use of energy by moving object
If the light emitting section has large thickness, then it is easier to manufacture, but lateral fluorescence increases reducing forward projection efficiency
Solution Approach 1:
The patent specifies optimizing the thickness parameter of the light emitting section to minimize lateral fluorescence while maintaining manufacturability. By carefully controlling this dimensional parameter, the system achieves superior forward projection efficiency without making the manufacturing process excessively complex.
Solution Approach 2:
The patent addresses lateral fluorescence by controlling the thickness dimension of the light emitting section. By optimizing this specific dimensional parameter, the system directs fluorescence primarily in the forward direction rather than laterally, effectively using dimensional control to solve the projection efficiency problem.
3Use of energy by moving object
If the upper surface area of light emitting section is small, then the device is more compact, but the excitation light coverage is insufficient
Solution Approach 1:
The patent optimizes the upper surface area parameter of the light emitting section to achieve adequate excitation light coverage while maintaining device compactness. By carefully controlling this surface parameter, the system ensures sufficient light-matter interaction area without compromising the overall compact design.
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 optimized configuration significantly increases the use efficiency of fluorescence, reducing energy consumption and extending the light-emitting duration by minimizing losses and ensuring most of the fluorescence is projected effectively as illumination light.
Implementation Method 1
a light emitting section for emitting fluorescence upon receiving the excitation light emitted from the excitation light source
Data Source
AI summary
A headlamp of one embodiment of this invention includes a laser element for emitting a laser beam, a light emitting section for generating fluorescence upon receiving the laser beam, and a reflecting mirror for projecting the fluorescence. Distribution of the fluorescence emitted by the light emitting section corresponds to Lambertian distribution, and an incident angle of the laser beam with respect to an excitation light irradiated surface, which is a surface of the light emitting section irradiated with the laser beam, is set so that use efficiency of the fluorescence emitted by the light emitting section is increased.