Vehicle Headlamp Optics for Sharp and Blurred Cutoff Balance
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Solution Overview
Problem
Existing vehicle headlamps face a challenge in balancing the need for a low beam light distribution pattern that is easy to see by blurring the cutoff line while preventing glare to oncoming or preceding vehicles, while also requiring a simplified configuration to reduce manufacturing costs.
Innovation Solution
A vehicle headlamp design incorporating a first optical member with a sharp cutoff line and a second optical member with a blurred cutoff line, utilizing parabolic reflectors and light sources to form overlapping light distribution patterns, allowing for both sharp and blurred cutoff lines with a simplified configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a blurred cutoff line is formed to enhance driver visibility, then visibility is improved, but the configuration becomes more complex and manufacturing costs increase
Solution Approach 1:
The headlamp is divided into two independent optical members: a first optical member that produces a sharp cutoff line and a second optical member that produces a blurred cutoff line. This segmentation allows each component to perform its specific function independently, achieving both sharp and blurred cutoff lines without requiring a single complex optical system.
Solution Approach 2:
The patent combines the first optical member and second optical member into a single headlamp assembly, where their light distribution patterns overlap. The first optical member provides the sharp cutoff line for glare prevention, while the second optical member adds the blurred cutoff line for enhanced visibility, merging their complementary functions to resolve the contradiction.
2Object-affected harmful factors
If a sharp cutoff line is formed to prevent glare to oncoming vehicles, then glare prevention is improved, but driver visibility at long distances deteriorates
Solution Approach 1:
The headlamp is divided into two independent optical members: a first optical member that produces a sharp cutoff line and a second optical member that produces a blurred cutoff line. This segmentation allows each component to perform its specific function independently, achieving both sharp and blurred cutoff lines without requiring a single complex optical system.
Solution Approach 2:
The first optical member provides a sharp cutoff line in the lower region to prevent glare, while the second optical member provides a blurred cutoff line in the upper region to enhance visibility. This local differentiation of optical properties allows the system to simultaneously satisfy both glare prevention and visibility enhancement requirements in different spatial zones.
3Illumination intensity
If a blurred cutoff line is formed using a PES-type optical member, then visibility is improved, but manufacturing cost increases
Solution Approach 1:
The patent uses a second reflector with a parabolic shape, which is a simpler and more cost-effective optical component compared to complex PES-type optical members. The parabolic reflector can be manufactured using conventional molding techniques, significantly reducing manufacturing costs while still achieving the desired blurred cutoff line effect when positioned appropriately.
Solution Approach 2:
The patent replaces the complex mechanical/optical PES-type system with a simpler parabolic reflector geometry. By utilizing the inherent light-reflecting properties of a parabolic shape and strategic positioning behind the first light source, the system achieves blurred cutoff line formation without requiring expensive specialized optical components.
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 design achieves enhanced visibility at a low cost by forming both sharp and blurred cutoff lines, reducing manufacturing complexity and costs, and providing an aesthetically pleasing design suitable for vehicles with high attachment positions.
Implementation Method 1
a second reflector having a parabolic shape that reflects light emitted from the second light source forward of the vehicle headlamp
Data Source
AI summary
A vehicle headlamp includes a first optical member that has a first cutoff line and forms a first light distribution pattern by irradiating at least a region below the first cutoff line with light, and a second optical member that has a second cutoff line, which is more blurred than the first cutoff line, and forms a second light distribution pattern emitted to a position overlapping at least a portion of the first cutoff line. The second optical member includes a second light source and a second reflector having a parabolic shape that reflects light emitted from the second light source forward of the vehicle headlamp.