Headlight Optical Layout for Sharp Low-Beam Cut-Off
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Solution Overview
Problem
Existing vehicle headlights face a low light utilization rate due to the need for shading technology to achieve a clear low beam cut-off line, which results in inefficient light emission.
Innovation Solution
A headlight design featuring a light-emitting device with first and second light-emitting units, where the distance of the first units to the front focal plane is less than that of the second units, allowing for improved definition of the low beam cut-off line and uniformity in illumination areas without the use of a shading plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If shading technology is used to achieve a clear low beam cut-off line, then the definition of the cut-off line is improved, but the light utilization rate deteriorates
Solution Approach 1:
The light-emitting device is segmented into multiple light-emitting units arranged at different positions and orientations. Each unit independently contributes to different portions of the beam pattern, allowing the cut-off line to be formed by the collective emission pattern rather than by blocking light, thus maintaining high light utilization while achieving precise cut-off definition.
Solution Approach 2:
Different light-emitting units are positioned and oriented to provide different local lighting characteristics. Units near the optical axis are oriented to create the sharp cut-off line, while units at larger angles provide broader illumination, allowing each region to optimize its function without compromising overall light efficiency.
2Device complexity
If a single light source is used to illuminate both high beam and low beam areas, then the device complexity is reduced, but the uniformity of illumination deteriorates
Solution Approach 1:
The single light-emitting device is divided into multiple independent light-emitting units that can be individually controlled. This segmentation allows different units to be activated selectively for high beam or low beam modes, and enables precise control over the illumination pattern to achieve uniform coverage across different beam types without requiring multiple separate light sources.
Solution Approach 2:
The illumination pattern is made dynamic through selective activation of different light-emitting units. The system can transition between high beam and low beam modes by controlling which units are active, and can adjust the illumination distribution within each mode to maintain uniformity, providing adaptability while using a single integrated device structure.
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 design enhances light utilization by reducing the projection divergence angle of the first light-emitting units for clear cut-off lines and increasing the divergence angle of the second units for uniform illumination, reducing light and dark stripes and improving overall light efficiency.
Implementation Method 1
a lens configured to project a light of the first light-emitting units and/or the second light-emitting units
Data Source
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AI summary
Provided is a headlight (101). The headlight comprises a light-emitting device (102), wherein the light-emitting device (102) comprises: a first light-emitting module (104) comprising multiple first light-emitting units (106),wherein the arrangement of the multiple first light-emitting units (106) is consistent with a low beam cut-off line (107) of the headlight (101); a second light-emitting module (105) comprising multiple second light-emitting units (108). The headlight further comprises a lens (103) for projecting the light of the first light-emitting unit (106) and/or the second light-emitting unit (108). The distance between the first light-emitting unit (106) and the front focal plane (SF) of the lens (103) being less than the distance between the second light-emitting unit (108) and the front focal plane (SF) can ensure the definition of the low beam cut-off line (107) of the headlight (101) and the uniformity of light in other illumination areas of the headlight (101),and also improve the light utilization rate.