Lamp Mask Layout for Uniform Short- and Long-Distance Beam Patterns
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Solution Overview
Problem
Conventional rear guide lamps produce beam patterns with non-uniform illumination intensity across different distances, leading to degraded visual recognition for drivers and pedestrians due to significant differences in illumination between short and long distance patterns.
Innovation Solution
A lamp design incorporating a mask with distinct short and long distance areas, utilizing shield dots and transmission areas to optimize beam pattern formation, where the radius of shield dots is calculated to minimize intensity differences, enhancing the uniformity of the beam pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional guide lamp uses a simple mask structure, then the device complexity is low, but the uniformity of the beam pattern is degraded due to different illumination intensities at short and long distances
Solution Approach 1:
The mask is segmented into multiple functional areas: a short distance area with first transmission dots, a long distance area with second transmission dots, and a pattern shield area with shield dots. Each area has different dot configurations optimized for its specific function, allowing the mask to control illumination intensity at different distances independently and achieve uniform beam pattern composition
Solution Approach 2:
Different regions of the mask are given different local properties: the short distance area has transmission dots with specific spacing for near-field illumination, the long distance area has different dot spacing for far-field illumination, and the pattern shield area has shield dots to block specific light paths. This local differentiation allows each region to optimize its illumination characteristics, achieving overall beam pattern uniformity
2Illumination intensity
If the mask allows all light to pass through, then the illumination intensity is high, but the uniformity between short and long distance patterns is degraded
Solution Approach 1:
The mask segments light transmission by creating distinct transmission areas for short and long distances, with each area having optimized dot patterns. The pattern shield area segments and blocks specific light paths. This segmentation allows the mask to control and balance illumination intensity at different distances, achieving uniformity while maintaining overall high illumination levels
Solution Approach 2:
The shield dots in the pattern shield area convert potentially harmful excessive illumination into beneficial controlled illumination. By strategically placing opaque shield dots, the mask blocks specific light paths that would create intensity imbalances, transforming what could be seen as light loss into a mechanism for achieving uniform beam pattern illumination across different distances
3Illumination intensity
If the short distance light is not shielded, then the short distance pattern illumination is high, but the uniformity with long distance pattern is degraded
Solution Approach 1:
The pattern shield area applies local quality control by placing shield dots in specific positions to block short distance light paths that would create intensity imbalances. This localized shielding allows the short distance area to maintain its transmission characteristics while the shield dots selectively reduce illumination in specific regions, achieving uniformity with the long distance pattern without completely blocking short distance illumination
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 solution enhances the uniformity of the beam pattern, improving visual recognition for drivers and pedestrians by minimizing the difference in illumination intensities between short and long distance patterns, thereby addressing the non-uniformity issue in conventional designs.
Implementation Method 1
a mask that forms a beam pattern on a road surface as the light output from the light source reaches the mask, any portion of the reaching light is input thereto and then is output therefrom
Data Source
AI summary
Disclosed is a lamp includes a light source that outputs light, and a mask that forms a beam pattern on a road surface as the light output from the light source reaches the mask, any portion of the reaching light is input thereto and then is output therefrom, and the mask includes a long distance area that forms a long distance pattern in the beam pattern on the road surface as long distance light in the light output from the light source reaches the long distance area, and at least a portion of the reaching long distance light is input thereto and then is output therefrom, and a short distance area that forms a short distance pattern in the beam pattern, which is located at a distance that is closer to the mask than the long distance pattern, on the road surface as short distance light in the light output from the light source reaches the short distance area, and any portion of the reaching short distance light is input thereto and then is output therefrom.