Motor Vehicle Headlight Optical Body Dust Hiding
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Solution Overview
Problem
Dust deposits on the light exit faces of ancillary optics in motor vehicle headlights cause dark flecks in the light distribution, disturbing the homogeneity of the light segments.
Innovation Solution
The ancillary optics are configured such that their light-decoupling faces protrude beyond the boundary edges of the delimiting walls, ensuring that the boundary edges are imaged sharply while the light-decoupling faces are imaged in a blurred manner, thus hiding dust deposits and maintaining a homogeneous light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light-decoupling faces are arranged in the same plane as the boundary edges, then the boundary edges are sharply imaged and light segments are sharply delimited, but dust deposits on the light-decoupling faces are visible as dark flecks in the light distribution
Solution Approach 1:
The invention moves the light-decoupling faces from the same plane as the boundary edges to a protruding position in the light exit direction. This dimensional change creates a depth difference that allows the projection lens to focus on the boundary edge plane while defocusing the light-decoupling faces, thereby hiding dust deposits without compromising light segment delimitation sharpness
2Object-affected harmful factors
If the light-decoupling faces protrude beyond the boundary edges, then dust deposits are defocused and hidden, but the boundary edges must still be kept in the focal plane for sharp imaging
Solution Approach 1:
The invention applies different spatial positions to different parts of the optical body: the light-decoupling faces protrude in the light exit direction to be defocused and hide dust, while the boundary edges remain in the focal plane for sharp imaging. This local differentiation of spatial quality allows simultaneous achievement of dust hiding and sharp light segment delimitation
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 ensures that the light segments remain sharply delimited and homogeneous, with dust deposits being defocused and not visible, thereby improving the optical performance of the headlight.
Implementation Method 1
The focal point of a projection lens arranged downstream of the optical body, which projection lens images the light distribution into a region in front of the vehicle, lies here in this common plane, such that the boundary edges of the delimiting walls are imaged as sharply as necessary in the light pattern
Implementation Method 2
Due to the protruding arrangement of the light-decoupling faces with respect to the boundary edges, the boundary edges, which are still arranged in a plane containing the focal point of the downstream projection lens, are still imaged sharply, whereas the light-decoupling faces are imaged in a defocussed manner and accordingly are imaged in a blurred manner
Data Source
AI summary
The invention relates to a lighting device (500) for a motor vehicle headlight, wherein the lighting device comprises at least one optical body (1) and at least one mounting device (100) for the at least one optical body (1), wherein the at least one optical body (1) has a number of adjacently arranged ancillary optics (11, 12, 13, 14, 15), wherein each ancillary optics (11-15) is formed from a light-guiding material and each ancillary optics (11-15) has a light-coupling face (11a-15a) and a light-decoupling face (11b-15b), wherein the at least one mounting device (100) has at least one receptacle (111, 112, 113, 114, 115) for each ancillary optics (11-15), and wherein receptacles (111-115) are delimited by delimiting walls (111′, 112′, 113′, 114′, 115′), wherein the delimiting walls (111′, 112′, 113′, 114′, 115′) have boundary edges (111a′, 112a′, 113a′, 114a′, 115a′) on the light exit side, which boundary edges (111a′, 112a′, 113a′, 114a′, 115a′) are imaged, in a light distribution produced by means of the at least one optical body (1), as light-dark edges between the partial light distributions produced by the individual ancillary optics (11-15), and wherein a projection arrangement, preferably a projection lens (501), is arranged downstream of the at least one optical body (1) in the light exit direction, and wherein the ancillary optics (11-15) are arranged and/or configured in such a way that the light-decoupling faces (11b-15b) of the ancillary optics (11-15) protrude in the light exit direction beyond the boundary edges (111a′, 112a′, 113a′, 114a′, 115a′) of the delimiting walls (111′, 112′, 113′, 114′, 115′).