Motor Vehicle Light-Scattering Surface Calculation
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Solution Overview
Problem
Existing light-scattering surfaces in motor vehicle components, such as headlights, exhibit undefined scattering behavior due to random and unoptimized microstructures, leading to inefficient light distribution with unwanted scattering into non-desired areas.
Innovation Solution
A method is developed to specify the scattering behavior of light-scattering surfaces by selecting a Bidirectional Scattering Distribution Function (BSDF) and calculating the geometric shapes and distribution of micro-optical elements, ensuring the surface appears diffuse while optimizing light scattering for targeted applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If random grain structures are used on light-scattering surfaces, then the surface appears diffuse and irregular, but the scattering behavior becomes undefined and light is scattered into undesired areas
Solution Approach 1:
The patent changes the parameters of the micro-optical elements from completely random to a controlled random distribution with specified size ranges (0.1mm to 2mm) and geometric shapes (pyramids, cones, hemispheres). This allows the surface to maintain its diffuse appearance while achieving defined scattering behavior through the BSDF function, resolving the contradiction between appearance and scattering efficiency.
Solution Approach 2:
The patent applies different geometric shapes and sizes of micro-optical elements at different locations on the surface, with each element's properties optimized for its specific position and function. This local optimization allows the overall surface to appear diffuse while each local area contributes to the desired light distribution pattern.
2Loss of energy
If regular structures are created to achieve targeted scattering behavior, then light distribution is optimized, but the surface appears structured and no longer diffuse
Solution Approach 1:
The patent uses asymmetric and varied geometric shapes (pyramids, cones, hemispheres) with different orientations and sizes distributed randomly across the surface. This asymmetry and variation prevent the formation of visible regular patterns while still achieving targeted scattering behavior through the controlled random distribution of optically active elements.
Solution Approach 2:
Instead of creating visible regular structures to control light scattering, the patent inverts the approach by using invisible or barely visible micro-optical elements with random distribution patterns. The control is achieved not through visible geometry but through the statistical and optical properties of the micro-element ensemble, reversing the conventional relationship between visible structure and optical function.
3Manufacturing precision
If micro-optical elements are made visible to the naked eye, then the surface structure can be observed and controlled, but the diffuse appearance is lost
Solution Approach 1:
The patent specifies that micro-optical elements should have sizes in the range of 0.1mm to 2mm, with preferred sizes below the resolution limit of the human eye. This parameter control allows precise manufacturing and optical control while maintaining the appearance of a smooth or grainy surface without visible individual elements, resolving the contradiction between controllability and visual appearance.
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 method creates a surface with controlled scattering behavior, reducing unwanted light emission and enhancing light efficiency by generating a diffuse appearance without visible regular patterns, allowing for precise light distribution and improved optical performance.
Implementation Method 1
the light-scattering surface is composed of light-scattering micro-optical elements
Implementation Method 2
the algorithm comprises the following sub-steps: d3) Calculating the geometric shape of the reflection or transmission surfaces of micro-optical elements
Implementation Method 3
in the case of a transmitting component, a step b1) also follows, after which a material from which the surface is composed is selected to take the refractive index into account
Data Source
Figure 1a~2c
Figure 3a~4b
Figure 5a~5c
AI summary
The invention relates to a method for calculating an optically relevant motor-vehicle component (1) with a light-diffusing surface (1a), comprising the following steps: a) selecting a predeterminable BSDF distribution (2) of the light-diffusing surface (1a) of the optically relevant motor-vehicle component (1), wherein the light-diffusing surface (1a) is made up of light-diffusing micro-optical elements (3a, 3b, … 3x), b) selecting the information as to whether the light-diffusing surface (1a) acts exclusively in a reflectively light-diffusing manner or whether there is a transmitting fraction, wherein, in the case of the presence of a transmitting fraction, this is also followed by a step b1) in which a material of which the surface (1a) is made up is selected to take into account the refractive index, c) selecting a parameter predetermining the size range of the micro-optical elements (3a, 3b, … 3x) from a predeterminable selection range, d) calculating different forms of micro-optical elements (3a, 3b, … 3x) and the quantitative distribution thereof according to an algorithm (4) for achieving the BSDF distribution selected according to step a) while taking into account the selected size range according to step c) and also, if applicable, the optical properties of the material according to step b1), wherein the surface is made up according to step a) of a multiplicity of micro-optical elements (3a, 3b, … 3x) which are arranged two-dimensionally alongside one another and consist of the material according to step c), wherein the algorithm comprises the following substeps: d1) using at least part of the BSDF distribution, d2) dividing the distribution according to step d1) into angle-dependent subregions, d3) calculating the geometrical form of the reflection or transmission surfaces of micro-optical elements for each subregion, d4) determining the quantitative fraction of the micro-optical elements for each subregion in dependence on the value of the distribution function for the subregion, d5) randomized distribution (Pa, Pb, …Px) of the micro-optical elements (3a, 3b, … 3x) determined according to step d4) over the surface (1a) of the optically relevant motor-vehicle component (1), e) outputting the result of the calculation according to step d) in the form of digital data (D).