Vehicle Headlamp Cut Surface Glare Prevention
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Solution Overview
Problem
Vehicle lighting devices often cause glare for oncoming drivers due to light being reflected by the cut surfaces of lenses, which is a safety and regulatory concern.
Innovation Solution
A lighting device with a multi-stage total internal reflection lens and a light scattering part on the cut surface, along with an adjusting lens and a light cover part, to ensure straight light propagation and prevent glare by scattering incident light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a lens with a cut surface is used to control light direction, then light propagation is improved, but glare is generated for oncoming drivers
Solution Approach 1:
The patent converts the harmful glare effect caused by light reflection on the cut surface into a beneficial scattering effect. By applying a light scattering part with specific roughness (15-70 μm) on the cut surface, the harmful reflected light is transformed into scattered light that illuminates the road edge area, turning the glare problem into a useful lighting function that improves both safety and compliance with regulations.
2Object-affected harmful factors
If a light scattering part with rough surface is applied on the cut surface, then glare is reduced, but light propagation efficiency may be affected
Solution Approach 1:
The patent optimizes the surface roughness parameter of the light scattering part within a specific range (15-70 μm). This parameter optimization ensures that the light scattering effect is sufficient to reduce glare to acceptable levels (50 cd or less) while minimizing light energy loss. The multi-stage total internal reflection lens further enhances light utilization efficiency, ensuring that the scattering process does not significantly compromise overall lighting performance.
3Illumination intensity
If multiple lens parts are used to control light direction, then light distribution is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple light control functions into an integrated lens assembly where the inducing lens part with cut surface and the adjusting lens part work together as a unified system. The cut surface is precisely formed to correspond to the adjusting lens dimensions, creating a compact integrated structure that achieves complex light distribution patterns (including low beam patterns) without requiring separate independent components for each function.
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 effectively prevents glare by scattering light with a rough surface scattering part, ensuring safe and compliant light distribution, reducing glare intensity to 50 cd or less.
Implementation Method 1
a light scattering part formed on the cut surface so as to prevent glare caused by light incident on the cut surface
Implementation Method 2
an inducing lens part configured to guide the light irradiated from the lamp part
Implementation Method 3
an adjusting lens part formed at the front of the inducing lens part, and configured to adjust the direction of the light moved through the inducing lens part
Data Source
AI summary
A lighting device for a vehicle may include: a lamp part configured to irradiate light; an inducing lens part configured to guide the light irradiated from the lamp part, and having a cut surface formed thereon; an adjusting lens part formed at the front of the inducing lens part, and configured to adjust the direction of the light moved through the inducing lens part; and a light scattering part formed on the cut surface so as to prevent glare caused by light incident on the cut surface.