Vehicle Headlamp Reflector Segmentation for Cut-Off Illuminance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vehicle headlamps using surface light sources face a challenge in achieving sufficient illuminance near the cut-off lines of the low beam light distribution pattern, which affects far-field visibility.
Innovation Solution
A vehicle headlamp design featuring a surface light source with a reflector having segments of different reflection properties, where the second area with a small disposition angle is used to form the hot zone, concentrating the high luminous intensity light source image to increase illuminance near the oblique and horizontal cut-off lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a surface light source is used in a vehicle headlamp, then the illumination angle is increased to about 180 degrees, but the illuminance becomes weak near the cut-off lines of the low beam light distribution pattern
Solution Approach 1:
The reflector is divided into multiple segments (first, second, and third areas) with different disposition angles relative to the light emitting surface. Each segment is specifically designed to control light reflection to different regions of the light distribution pattern, with the second area segment specifically targeting the cut-off line regions to enhance illuminance while maintaining the broad illumination coverage.
Solution Approach 2:
Different regions of the reflector are assigned different reflection properties and disposition angles. The second area with small disposition angle is specifically optimized to reflect light onto the cut-off lines, creating localized high illuminance in these critical regions while other areas maintain their respective functions for overall light distribution.
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 enhances illuminance near the cut-off lines, thereby improving far-field visibility by projecting a narrow, high-intensity light source image onto the relevant areas, including the oblique and horizontal cut-off lines.
Implementation Method 1
a reflector that reflects light emitted from the surface light source to the front to form a low beam light distribution pattern
Data Source
AI summary
A vehicle headlamp includes a surface light source and a reflector that forms a low beam light distribution pattern having an oblique cut-off line and a horizontal cut-off line. The surface light source is provided in a perpendicular direction with respect to an optical axis of the reflector, and the reflector forms a hot zone of the light distribution pattern by first areas with a great disposition angle and second areas with a small disposition angle where a light source image of the surface light source becomes narrow and small.