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http://dx.doi.org/10.3807/KJOP.2019.30.1.008

Correction and Evaluation for Color Aberration on the Cut-off Line of a Vehicle Headlamp  

Shim, Ju Yong (Department of Physics, Dankook University)
Park, Sung-Chan (Department of Physics, Dankook University)
Publication Information
Korean Journal of Optics and Photonics / v.30, no.1, 2019 , pp. 8-14 More about this Journal
Abstract
This paper presents methods to correct and evaluate the chromatic aberration occurring on the cut-off line of a headlamp without additional optical components and alignment process. To correct the chromatic aberration using a geometrical concept, the maximum differences in exit-ray angle between wavelengths are reduced by tilting the convex surface of an aspheric projection lens. To evaluate the chromatic aberration, the position and luminous intensity to be measured are suggested, and the criterion for chromatic aberration is presented through color coordinates. From the evaluation of an automotive headlamp designed using this geometrical method, it is found that the chromatic aberration of the cut-off line is significantly reduced.
Keywords
Headlamp; Cut-off line; Color aberration; Optical system design;
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  • Reference
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