Low-Beam Lamp Shade Geometry for Glare and Distance Visibility
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Solution Overview
Problem
Existing vehicle lamps struggle to balance preventing glare to oncoming vehicles while maintaining long-distance visibility of the vehicle's front travel path, as setting the inclination angle of the inclined portion in the cutoff line to a large value reduces long-distance visibility, and setting it to a small value increases glare.
Innovation Solution
The vehicle lamp is designed with a shade that forms a stepped cutoff line where the inclination angle of the inclined portion is smaller in the lower region than in the upper region, and includes an upward reflection surface to reflect light, allowing for a configuration that prevents glare and enhances long-distance visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the inclination angle of the inclined portion is set to a large value, then glare to oncoming vehicle driver is prevented, but visibility of long-distance region of vehicle front travel path is reduced
Solution Approach 1:
The shade is designed with different inclination angles in different regions: a first inclination angle in an upper region and a second inclination angle (smaller than the first) in a lower region. This local differentiation allows the upper portion to effectively block glare to oncoming drivers while the lower portion maintains illumination for long-distance visibility.
Solution Approach 2:
The inclined portion of the cutoff line is segmented into multiple regions with different inclination angles. The shade structure is divided into an upper region and a lower region, each with optimized inclination angles to address different functional requirements: glare prevention in the upper region and long-distance visibility in the lower region.
2Illumination intensity
If the inclination angle of the inclined portion is set to a small value, then visibility of long-distance region of vehicle front travel path is improved, but glare to oncoming vehicle driver increases
Solution Approach 1:
Different regions of the shade are assigned different inclination angles tailored to their specific functions. The lower region uses a smaller inclination angle to maximize long-distance visibility, while the upper region uses a larger inclination angle to prevent glare, creating optimized local characteristics throughout the structure.
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 prevents glare to oncoming vehicles while improving long-distance visibility by adjusting the inclination angle of the shade's inclined portion, ensuring both functions are achieved simultaneously.
Implementation Method 1
a projection lens; a light source disposed on a lamp rear side with respect to a rear focal point of the projection lens
Implementation Method 2
a shade disposed between the light source and the projection lens, and configured to block a part of light emitted from the light source to form a cutoff line of the low beam light distribution pattern
Implementation Method 3
includes an upward reflection surface to reflect light, allowing for a configuration that prevents glare and enhances long-distance visibility
Data Source
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AI summary
The present invention prevents glare to an oncoming vehicle driver or the like and improves the distant visibility of a vehicle front travel path in a vehicle lamp configured to form a low beam light distribution pattern. By arranging a shade between a light source and a projection lens, a stepped cutoff line CL in which a lower stage cutoff line CL1 and an upper stage cutoff line CL2 are connected via an inclined part CL3 is formed as a cutoff line of a low beam light distribution pattern PL. At this time, the shape of the shade is set such that the inclination angle of the inclined part CL3 becomes smaller in the lower region than in the upper region of the inclined part CL3. Thus, glare to an oncoming vehicle driver, a preceding vehicle driver or the like is prevented by increasing the inclination angle of the upper region of the inclined part CL3, and the visibility of a distant region of a vehicle front travel path is improved by reducing the inclination angle of the lower region of the inclined part CL3.