Abstract
We propose a design method of asymmetric double freeform surface lens for an integrated LED automobile headlamp and develop an integrated LED automobile optical system. A single asymmetric double freeform surface lens is designed to redistribute rays emitting from the light source for realizing both low and high beams. Moreover, a freeform surface reflector is used to improve the energy efficiency of high beams. The prism placed in the optical path can suppress chromatic dispersion on the edge of the target plane. Simulation and experimental results show that the illumination values and color temperature of the key points can fully meet the requirements of United Nations Economic Commission for Europe vehicle regulations (ECE) R112, 48, and 128. The volume of the whole optical system comprised of freeform surface elements is smaller than that of the low beam system of a traditional headlamp, resulting in saved space, in which other electronic devices can be installed for the safety of the driver, which indicates that the proposed method is practical in the field of automobile lighting.
Highlights
We proposed a method of designing an asymmetric double freeform surface lens (ADFSL) and developed an integrated LED automobile optical system
The closer to the original point, the greater the value of th intensity distribution of the light focused by the freeform surface refle ing Equation (8), the mapping relationship can be acquired, and the half of the ADFSL is calculated by the normal vector iteration
The light shape of the low beam and high beam and simulation values of the key points fully comply with the requirements of Europe vehicle regulations (ECE) R112; the chromatic dispersion can be largely suppressed by using a new integrated optical system
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Domhardt et al designed a combined lens for LED-based low beam headlamp but needed large space to install lenses for high energy efficiency [10]. M. Rice et al proposed an integrated headlamp based on a projective lowbeam system, in which the light emitted from the high-beam source was reflected by the lower plane of the baffle plate and deflected by the lens to form the illumination distribution of high beams [26]. We proposed a method of designing an asymmetric double freeform surface lens (ADFSL) and developed an integrated LED automobile optical system. Compared to the traditional, separated headlamp and integrated headlamp, the proposed headlamp has only one single lens to achieve low and high beams, reducing the volume of the automobile headlamp. The color distribution on the target plane using ADFSL and prism is more stable
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