Asymmetric Phosphor Exiting Surface for Vehicle Headlight
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Solution Overview
Problem
Existing vehicle headlight designs using LEDs often experience blurring of the light distribution pattern due to unintended light dispersion in the height direction, which can lead to unclearness and potential dazzling of pedestrians.
Innovation Solution
A headlight configuration featuring a light source with a substrate-mounted LED chip and a phosphor layer, where the phosphor's exiting surface dimensions are optimized to reduce height-direction dispersion while maintaining lateral spread, allowing for a more focused light distribution pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a square-shaped light emitting surface is used to make full use of LED light, then light utilization efficiency is improved, but light distribution pattern blurring occurs in the height direction
Solution Approach 1:
The patent applies asymmetry by changing the light emitting surface from a square shape to a rectangular shape with different dimensions in the height and lateral directions. Specifically, the dimension in the lateral direction is made larger than the dimension in the height direction, creating an asymmetric rectangular configuration that optimizes light distribution while preventing blurring in the height direction.
Solution Approach 2:
The patent applies local quality by making the light emitting surface have different dimensional characteristics in different directions. The lateral dimension is enlarged to ensure sufficient light spread, while the height dimension is controlled to prevent excessive spread and maintain pattern clarity, giving different functional qualities to different spatial dimensions of the same light emitting surface.
2Illumination intensity
If the light emitting surface dimension in the height direction is increased to improve light spread, then light distribution coverage is improved, but pattern blurring and cut line unclearness occur
Solution Approach 1:
The patent resolves this contradiction by creating an asymmetric rectangular light emitting surface where the lateral dimension exceeds the height dimension. This asymmetric configuration ensures adequate light spread coverage through the larger lateral dimension while the controlled, smaller height dimension prevents excessive vertical spread that would cause cut line blur and pattern unclearness.
Solution Approach 2:
The patent applies parameter changes by specifically adjusting the dimensional parameters of the light emitting surface. The height dimension is set to a smaller value and the lateral dimension to a larger value, creating an optimized parameter combination that balances light spread requirements with pattern clarity requirements, preventing both insufficient coverage and excessive blurring.
3Illumination intensity
If the light emitting surface dimension in the lateral direction is increased to ensure sufficient light spread, then lateral coverage is improved, but light may be radiated in unintended directions
Solution Approach 1:
The patent applies local quality by giving different dimensional characteristics to different spatial directions of the light emitting surface. The lateral dimension is enlarged to ensure sufficient light spread coverage, while the height dimension is controlled to a smaller value that prevents light from being radiated in unintended directions, creating directionally differentiated light emission characteristics.
Solution Approach 2:
The patent uses asymmetry by configuring the light emitting surface as a rectangle with the lateral dimension larger than the height dimension. This asymmetric shape allows the light to spread sufficiently in the lateral direction while limiting vertical spread, thereby ensuring adequate coverage without radiating light in unintended directions that would cause harmful effects.
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 configuration ensures a sufficient lateral spread of light while minimizing blurring in the light distribution pattern, enhancing clarity and safety by reducing unintended light dispersion in the height direction.
Implementation Method 1
a phosphor disposed on a light emitting surface of the light emitting diode chip. The phosphor includes an exiting surface through which the light from the light emitting surface penetrates and exits
Data Source
AI summary
A headlight for a vehicle includes a light source. The light source includes: a substrate; a light emitting diode chip; and a phosphor. The phosphor through which light exiting from a light emitting surface penetrates. The phosphor includes an exiting surface through which the light from the light emitting surface penetrates and exits. A first direction of the exiting surface corresponds to a height direction of a light distribution pattern by the light exiting from the exiting surface, and a second direction of the exiting surface corresponds to a spread in a lateral direction of the light distribution pattern. A dimension in the first direction of the exiting surface is smaller than a dimension in the second direction of the exiting surface.