Vehicle Projection Headlight Asymmetric Diaphragm Tip
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Solution Overview
Problem
Existing projection headlamps for vehicles suffer from unwanted reflections and scattered light due to the positioning of light source devices relative to reflector devices, leading to inaccuracies in light distribution, particularly at the aperture tip.
Innovation Solution
The light source devices are positioned at a greater or equal distance from the optical axis of the lens than the reflector devices, with the diaphragm tip inclined to reduce unwanted reflections and improve light distribution by guiding reflected light past the diaphragm apex, enhancing the luminous flux and reducing scattered light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the light source device is arranged at a greater distance from the optical axis than the reflector device, then the alignment with reflector surfaces is improved and luminous flux is increased, but unwanted reflections and scattered light occur on the screen
Solution Approach 1:
The diaphragm tip is designed with an asymmetric inclined configuration rather than a symmetric horizontal arrangement. This asymmetry allows the diaphragm tip to deflect reflected light away from the lens while maintaining the light source's optimal positioning for maximum luminous flux utilization.
Solution Approach 2:
The solution moves from a two-dimensional horizontal arrangement to a three-dimensional inclined configuration. By tilting the diaphragm tip in the vertical dimension, the patent creates a spatial solution that separates the harmful reflections from the optical path without compromising the horizontal light source positioning.
2Device complexity
If the diaphragm tip is arranged horizontally, then the structure is simple, but light reflected on the reflector surfaces is reflected again on the aperture tip leading to undesired scattered light
Solution Approach 1:
The patent introduces a vertical inclination angle to the diaphragm tip, transforming it from a horizontal 2D element to a 3D inclined surface. This dimensional change allows the diaphragm to perform multiple functions: maintaining structural simplicity while actively directing reflected light away from the optical path through its inclined geometry.
3Object-generated harmful factors
If the diaphragm tip is inclined to reduce scattered light, then unwanted reflections are reduced, but the image sharpness decreases towards larger angles
Solution Approach 1:
The diaphragm is designed with different orientations in different regions: the central area maintains sufficient sharpness while the peripheral regions benefit from the inclined configuration that reduces scattered light. This local differentiation optimizes both image quality and reflection control.
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 configuration results in a more homogeneous transition between light functions, maintaining image sharpness at the center while reducing scattered light and improving the accuracy of light distribution, particularly in generating low and high beam distributions.
Implementation Method 1
the luminous flux detected by the reflector surfaces can advantageously be increased
Implementation Method 2
a common lens assigned to the two projection light units
Implementation Method 3
light reflected in the second projection light unit not to be reflected again at the diaphragm tip
Data Source
Figure 1~2
Figure 3a~3b
Figure 4a~4b
AI summary
The invention relates to a projection headlight (1) for vehicles, comprising a first projection light unit (2) for generating a first light distribution and a second projection light unit (3) for generating a second light distribution, a common lens (11) positioned in front in the main irradiation direction, wherein the first projection light unit comprises a first reflector device (6), a first light source device (5) associated with the first reflector device, and a first aperture (7) arranged close to a rear focal point of the lens. The second projection light unit comprises a second reflector device (9), a light source device (8) associated with the second reflector device and a second aperture (10) arranged close to the rear focal point of the lens.