Vehicle Headlight Lighting Unit Aperture Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lighting units for motor vehicle headlamps face efficiency losses due to apertures used to create light-dark boundaries, which reduce luminous flux and overall efficiency, especially when generating wide light distributions with vertical or horizontal boundaries.
Innovation Solution
A lighting unit design with a first reflector divided into multiple portions, each with a focal point, and strategically placing apertures near specific reflector portions to clip intermediate light images and form light-dark boundaries while minimizing shadowing effects on other portions, thereby reducing luminous flux losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an aperture is introduced into the beam path to create a light-dark boundary, then a defined light distribution with sharp boundary is achieved, but luminous flux losses increase and efficiency decreases
Solution Approach 1:
The first reflector is divided into multiple reflector portions (e.g., first, second, third portions), each with its own focal point. The aperture is positioned to clip only the intermediate light image from the first reflector portion, while light from other reflector portions bypasses the aperture without shadowing, thus creating the light-dark boundary without excessive luminous flux loss.
2Loss of energy
If the first reflector is divided into multiple reflector portions with separate focal points, then the aperture can be selectively positioned to minimize shadowing, but device complexity increases
Solution Approach 1:
The first reflector is segmented into multiple portions, each with its own focal point positioned at different locations. This segmentation allows the aperture to be strategically positioned in the beam path of only one reflector portion, creating the light-dark boundary while other portions contribute full luminous flux without being shadowed by the aperture.
3Manufacturing precision
If the aperture is positioned close to the first reflector portion to clip its intermediate light image, then a sharp light-dark boundary is formed, but shadowing effects increase on other reflector portions
Solution Approach 1:
The aperture is positioned locally in the beam path of only the first reflector portion, creating a light-dark boundary specifically for that portion's intermediate light image. The other reflector portions have their beam paths arranged so they do not pass through the aperture region, thus avoiding shadowing and maintaining their full luminous flux contribution.
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 approach increases the efficiency of the lighting unit by minimizing aperture-related losses and maintaining a sharp light-dark boundary, achieving a higher luminous flux output compared to traditional designs.
Implementation Method 1
at least one first reflector having at least one focal point, wherein the at least one light source is arranged in the at least one focal point, and the at least one first reflector is configured to emit and forward light to a second reflector
Implementation Method 2
at least one second reflector having at least one focal point, wherein the at least one second reflector is arranged downstream of the at least one first reflector in the beam path and is configured to display an intermediate light image generated by the first reflector
Data Source
AI summary
The invention relates to a lighting unit for a motor vehicle headlight for generating a light distribution having a light-dark boundary, wherein the lighting unit (1) comprises a light source (2), a first reflector (R1) having at least one focal point (F1R1) in which the light source (2) is arranged, a second reflector (R2) having at least one focal point (F1R2), wherein the second reflector (R2) is arranged downstream of the first reflector (R1) in the beam path (S), and an aperture (B) arranged between the first reflector (R1) and the second reflector (R2). The first reflector (R1) has a first reflector portion (R11) and at least one second reflector portion (R12), the aperture (B) being arranged in such a way that it is associated with the first reflector portion (R11) of the first reflector (R1) and is arranged at a small distance (D1) near the beam (S11) emitted from the first reflector portion (R11), and clips the intermediate light image generated in the first reflector portion (R11) to form a light-dark boundary, and the intermediate light image generated in the second reflector portion (R12) is substantially free of influence of shadowing of the aperture arrangement.