Projection Headlight Screen Recess for Glare Reduction
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Solution Overview
Problem
Existing projection headlights with reflectors, light sources, and screens face challenges in reducing glare effects caused by light beams hitting the screen edge surface, which is difficult to manufacture effectively.
Innovation Solution
Designing a light beam reduction section as a recess on the screen edge surface, which creates a continuous cavity or channel-like opening to divert light away from the main beam direction, reducing glare by forming an illuminance reduction area above the light/dark boundary without altering the light-related requirements or manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light beam reduction section with frosted or corrugated surface is used, then glare effect is reduced, but manufacturing difficulty increases
Solution Approach 1:
The invention transitions from surface-level light modification (frosted or corrugated surfaces) to a three-dimensional recess structure. This dimensional change allows light beams to be diverted through spatial geometry rather than surface texture, achieving glare reduction while maintaining manufacturing feasibility through standardized recess designs that can be integrated into the screen production process.
Solution Approach 2:
The invention extracts the light beam reduction function from the screen surface itself by creating a recess that removes material to form a cavity. This extracted recess structure independently handles light diversion, separating the glare reduction function from the screen's primary reflective surface, thereby simplifying the overall manufacturing approach compared to complex surface treatments.
2Object-affected harmful factors
If a recess is introduced on the screen edge surface, then glare is reduced, but device complexity increases
Solution Approach 1:
The recess is strategically positioned only in the middle area of the elongated screen edge surface, specifically where the light/dark boundary intersects with the screen. This localized approach applies structural modification only where glare occurs, rather than complicating the entire screen structure, thereby minimizing overall device complexity while achieving effective glare reduction.
Solution Approach 2:
The screen edge surface is segmented into distinct functional zones: the recessed light beam reduction section in the middle area and the non-recessed areas at the ends. This segmentation allows the recess to be integrated as a specific functional element within the existing screen structure, rather than requiring complete structural redesign, thus limiting the increase in device complexity.
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 recess effectively reduces glare by minimizing light reflection in the main beam direction, achieving a significant decrease in illuminance in the central area of the light distribution, thus addressing the glare issue while maintaining the position and gradient of the light/dark boundary.
Implementation Method 1
at least part of the light beam emitted from the light source and hitting the light beam reduction section is not further reflected in the main direction of the beam
Data Source
AI summary
Projection headlights for vehicles with a reflector, with a light source assigned to the reflector, with a lens arranged in the main direction of the beam in front of the reflector and with a screen arranged in the region of the focal point of the lens, said screen being arranged between the light source and the lens and comprising an elongated screen edge surface having a contour on an upper edge in order to form a light/dark boundary of a light distribution arrangement, wherein the elongated screen edge surface comprises a light beam reduction section in a middle area, so that at least part of the light beam emitted from the light source and hitting the light beam reduction section is not further reflected in the main direction of the beam, wherein the light beam reduction section is designed as a recess.