Vehicle Headlamp Low-Beam Layout for Blurred Cutoff Visibility
Solution Overview
Problem
Conventional vehicle headlamps struggle to balance the need for an easy-to-see low-beam light distribution pattern by blurring the cutoff line while maintaining sufficient illuminance near the cutoff line, as high illuminance makes it difficult to blur the cutoff line effectively.
Innovation Solution
A vehicle headlamp design incorporating a first and second irradiator to form a low-beam light distribution pattern, where the first G-value at the upper end of the first light distribution pattern is 0.25 or more and 0.35 or less, and the second G-value at the upper end of the second light distribution pattern is also 0.25 or more and 0.35 or less, with the second light distribution pattern located above the first, ensuring a moderately blurred pattern with reduced stark bright-dark contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the illuminance of the low-beam light distribution pattern near the cutoff line is increased to improve visibility, then the visibility is improved, but it becomes difficult to blur the cutoff line effectively
Solution Approach 1:
The patent divides the light distribution into multiple segments with different G-value ranges. The first light distribution pattern has G1 values of 0.25-0.35, the second has G2 values of 0.36-0.46, and the third has G3 values of 0.47-0.57. This segmentation allows different regions to have different illuminance characteristics, enabling the cutoff line to be blurred while maintaining visibility in specific areas without requiring uniform high illuminance across the entire pattern.
Solution Approach 2:
The patent applies different G-value characteristics to different local regions of the light distribution pattern. By controlling the G-values in specific angular ranges (β1, β2, β3), the invention creates local variations in illuminance distribution. This allows the cutoff line to be blurred in regions where lower G-values are applied, while maintaining adequate visibility in other regions, thus resolving the contradiction between overall visibility and cutoff line blurring.
2Difficulty of detecting and measuring
If the cutoff line is blurred to achieve easy-to-see light distribution pattern, then the visibility is improved, but the illuminance of the low-beam light distribution pattern near the cutoff line becomes excessively dark
Solution Approach 1:
The patent segments the light distribution into three distinct patterns with progressively different G-value ranges. The first pattern (G1: 0.25-0.35) provides the base illuminance level, the second pattern (G2: 0.36-0.46) adds moderate blur, and the third pattern (G3: 0.47-0.57) provides the blurring effect. This segmentation ensures that even with blurring applied, the cumulative illuminance remains sufficient because the base pattern maintains adequate brightness levels.
Solution Approach 2:
The patent creates a composite light distribution pattern by superimposing multiple light distribution patterns with different G-value characteristics. The first, second, and third light distribution patterns are combined to form the final low-beam pattern. This composite approach allows the beneficial effects of each pattern (visibility from the first pattern, moderate blur from the second, and cutoff blurring from the third) to work together, achieving both blurring and sufficient illuminance simultaneously.
Data Source
AI summary
A vehicle headlamp that is mounted on a vehicle and forms a light distribution pattern including a low-beam light distribution pattern includes first irradiator that irradiates a first light distribution pattern that is a portion of the low-beam light distribution pattern, and a second irradiator that irradiates a second light distribution pattern that is a portion of the low-beam light distribution pattern, at least a portion of the second light distribution pattern being located above the first light distribution pattern. A first G-value at an upper end of the first light distribution pattern is 0.25 or more and 0.35 or less, and a second G-value at an upper end of the second light distribution pattern is 0.25 or more and 0.35 or less.