Vehicle Headlamp Lens Face Calculation Using Deformation Parameters
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Solution Overview
Problem
Existing headlamp designs require a large number of asphere coefficients for high accuracy, making the calculation of lens faces complex and costly, and lacking a clear geometric interpretation, which complicates the optimization process.
Innovation Solution
The introduction of two deformation parameters, one allowing laterally isotropic changes and the other isotropic changes, simplifies the lens face calculation by enabling directed and interpretable optimization, reducing the number of parameters needed and facilitating faster, more targeted correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a large number of asphere coefficients are used to achieve high accuracy in lens face calculation, then the manufacturing precision and illumination intensity are improved, but the device complexity and calculation time increase significantly
Solution Approach 1:
The patent transforms the lens face calculation from using multiple asphere coefficients to using only two deformation parameters (first and second deformation parameters). This parameter reduction maintains high accuracy in determining the lens face while dramatically simplifying the calculation process and reducing complexity.
Solution Approach 2:
The patent segments the lens face determination into two distinct deformation components: a first deformation parameter for changes in the direction of the optical axis, and a second deformation parameter for changes perpendicular to the optical axis. This segmentation allows independent optimization of each deformation type, achieving high precision with fewer parameters.
2Manufacturing precision
If multiple asphere terms are added to the lens equation to increase correction degree, then the manufacturing precision is improved, but the ease of operation and interpretation of the calculation process deteriorates
Solution Approach 1:
The patent replaces complex asphere coefficients with two physically meaningful deformation parameters that have direct geometric interpretations. The first deformation parameter controls optical axis direction changes, while the second controls perpendicular changes, making the calculation process more intuitive and easier to operate.
Solution Approach 2:
The patent introduces deformation parameters as intermediary concepts that bridge the gap between mathematical calculation and geometric interpretation. These parameters serve as mediators that connect the lens equation to the physical shape changes, enabling both high precision and intuitive understanding.
3Manufacturing precision
If a large number of parameters are used to describe the lens face, then the manufacturing precision is improved, but the productivity and optimization speed decrease
Solution Approach 1:
The patent reduces the parameter set from multiple asphere coefficients to just two deformation parameters, enabling faster optimization and calculation while maintaining high accuracy in lens face determination. This parameter reduction directly improves productivity without sacrificing precision.
Solution Approach 2:
By segmenting the lens face description into two independent deformation parameters, the patent enables more efficient optimization algorithms that can independently adjust each parameter to achieve the desired lens shape, significantly accelerating the design and optimization process.
Data Source
AI summary
The invention relates to headlamps for vehicles comprising a number of semiconductor-based light sources being arranged on a substrate, and comprising an optical unit having at least one lens with a lens face for the generation of a given light distribution, wherein the lens face can be calculated by means of a lens equation, which is formed by means of a conic section equation completed by a deformation parameter, so that the lens face is determined with a deviation from a conic section shape, wherein a first deformation parameter for the change of the lens face according to differing degrees of shape change in the direction of the optical axis and vertically to the optical axis are given on one hand and that a second deformation parameter for the change of the lens face according to identical degrees of shape change in the direction of the optical axis and vertically to the optical axis are given on the other hand.