Vehicular Headlamp Shade with Raised Portion for Cut-off Line Recess
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Solution Overview
Problem
Existing vehicle headlamps with modified shades to suppress glare at specific points suffer from illumination unevenness and excessive darkness in regions around the cut-off line, leading to noticeable illumination gradients.
Innovation Solution
A vehicle headlamp design featuring a shade with an upper end edge portion and a raised portion near the focal point of the projection lens, where the raised portion projects upward to form a recession in the cut-off line, allowing light to illuminate the inner area of the recession and create a gentler illumination gradient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a dent or protrusion is formed on the shade to suppress illuminance at a specific point, then the illuminance of the specific point is suppressed, but the region becomes excessively dark and illumination unevenness becomes noticeable
Solution Approach 1:
The invention applies local quality by forming a recess at a specific location on the shade (the projection's upper end surface) to reflect light locally toward the region Pa. This localized modification allows selective illumination control: the projection suppresses light at the specific point P, while the recess provides compensatory reflected light to region Pa, maintaining overall illumination uniformity without requiring global shade modification.
2Illumination intensity
If the cut-off line is recessed to suppress glare at specific points, then the illuminance at those points is reduced, but the illumination gradient becomes steep and creates noticeable unevenness
Solution Approach 1:
The invention introduces an intermediary element (the recess with its light-reflecting upper end surface) between the projection and region Pa. The recess acts as a mediator that redirects light from areas above the cut-off line into region Pa, softening the illumination gradient created by the projection's glare suppression function. This intermediary structure prevents abrupt transitions and creates a more gradual illumination change.
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 suppresses illuminance at specific points while maintaining a gentle illumination gradient around the low beam, preventing excessive brightness and unevenness.
Implementation Method 1
the light output from a light source 61 is projected in the front direction of the vehicle through a projection lens 63 after having been reflected by a reflector 62
Implementation Method 2
the light output from a light source 61 is projected in the front direction of the vehicle through a projection lens 63 after having been reflected by a reflector 62
Implementation Method 3
the raised portion 45 reflects light having passed above the projection 44 to illuminate an inner area of the recession
Data Source
AI summary
A vehicle headlamp includes a light source, a reflector, a projection lens, and a shade. The shade has an upper end edge portion and a raised portion. The upper end edge portion has a projection. The reflector reflects light output from the light source in the front direction. The projection lens in front of the light source projects the light. The shade between the reflector and the projection shields a portion of the light. The upper end edge portion contributes to form the upper end line of the low beam as a cut-off line. The projection contributes to form a recession of the cut-off line recessed below a specific point in the low beam. The raised portion reflects the light having passed above the projection to illuminate an inner region of the recession.