20 September 2011 Automotive headlamp concepts with low-beam and high-beam out of a single LED
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Abstract
Recent years have seen a surge in LED-based automotive headlamps including a variety of lighting functions like lowbeam, high-beam, day-time running light as well as fog-light. Many of those lighting functions have been realized by designs that statically provide specific illumination patterns. In contrast, existing adaptive designs rely on either moving shutters or electronically-complex matrix sources. In this paper, alternative options will be explored for an automotive headlamp that combines low-beam and high-beam out of a single LED. The light source comprises two rows of chips arranged on a common carrier resulting in a compact LED. At the same time, electronic complexity is reduced by driving just the two rows independently. Primary optics collects the emission of the two closely-spaced chip rows and simultaneously provides a way to separate respective contributions. The subsequent secondary optics is based on facetted reflector shapes to realize low-beam and high-beam patterns. Efficiency, tolerances, system size, and cross talk will be evaluated for different primary optics based on refraction, reflection as well as TIR.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peter Brick, Tobias Schmid, "Automotive headlamp concepts with low-beam and high-beam out of a single LED", Proc. SPIE 8170, Illumination Optics II, 817008 (20 September 2011); doi: 10.1117/12.895215; https://doi.org/10.1117/12.895215
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