Vehicle Headlamp Shield Member Blurring Light Boundary
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Solution Overview
Problem
Drivers experience physical discomfort when switching between high beam light distribution patterns in poorly lit environments, leading to reduced forward visibility and glare issues for both the driver and oncoming vehicles.
Innovation Solution
A vehicle headlamp design featuring a light source, a projection lens, a first shield member near the rear focal point to switch light distribution patterns, and a second shield member positioned away from the rear focal point to blur the boundary between illuminated and unilluminated areas, reducing glare and discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high beam light distribution patterns are switched between right high beam, left high beam and normal high beam, then forward visibility is improved and glare to other vehicles is reduced, but drivers experience physical discomfort and sensation of disorder in the upper area of the illumination
Solution Approach 1:
A second shield member is introduced as an intermediary element positioned away from the rear focal point of the projection lens. This shield member creates a blurred transition zone in the upper area of the high beam illumination, mediating between the illuminated and unilluminated regions to eliminate the sharp boundary that causes driver discomfort during pattern switching.
Solution Approach 2:
The light distribution is modified locally in the upper area of the high beam by positioning the second shield member to affect only this specific region. The shield member creates a localized blurred boundary effect without compromising the overall illumination quality and forward visibility provided by the high beam patterns.
2Manufacturing precision
If the second shield member is positioned at the rear focal point of the projection lens, then light distribution is precisely controlled, but the boundary between illuminated and unilluminated areas becomes sharp causing driver discomfort
Solution Approach 1:
The second shield member serves as a mediator that deliberately introduces optical diffusion. By positioning it away from the rear focal point, the shield member creates a blurred transition zone that softens the boundary between light and dark areas, eliminating the sharp boundary effect while maintaining adequate light distribution control.
Solution Approach 2:
The position parameter of the second shield member is changed from the rear focal point to a position away from it. This parameter change transforms the optical effect from a sharp boundary (when at focal point) to a blurred transition zone (when away from focal point), thereby reducing driver discomfort.
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 effectively reduces the sensation of physical disorder for drivers by smoothly transitioning between light distribution patterns, ensuring maximum forward visibility while minimizing glare for other vehicles.
Implementation Method 1
a projection lens that is disposed in front of the light source and which projects light from the light source to the front
Implementation Method 2
a second shield member that is disposed in a forward position or rearward position away from the rear focal point of the projection lens and which cuts off light of a high beam which illuminates an upper area, such that a boundary between an illuminated area and an unilluminated area blurs in the upper area of the high beam
Data Source
Figure 1
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AI summary
A vehicle headlamp (1A, 1B, 1C) is provided which includes a light source (11), a projection lens (30) that is disposed in front of the light source (11) and which projects light from the light source (11) to the front, a first shield member (40) that is disposed near a rear focal point of the projection lens (30) and which can switch light distribution patterns between at least one of a right high beam light distribution pattern and a left high beam light distribution pattern in both of which light from the light source (11) is partially cut off and at least one of a normal high beam light distribution pattern in which no part of light from the light source (11) is cut off and a low beam pattern, and a second shield member (50) that is disposed in a position which is spaced by a predetermined distance forwards or rearwards away from the rear focal point of the projection lens (30) and which cuts off light of a high beam which illuminates an upper area.