Design of an LED-based compound optical system for a driving beam system

Abstract

This paper proposes an LED-based compound optical system, which can be involved in the design of the driving beam system in automotive headlamps with high system efficiency and low power consumption. The compound system can meet the requirements announced in the UNECE regulation "Addendum 111: Regulation No. 112 Revision 2." Also, it is composed of a nonspherical reflector, a compound lens, and a two-dimensional diverging lens. Using a single device of high-brightness LED of merely 7.6 W, the specified illumination requirements for the driving beam can be achieved. As we have expected, on the test screen at a distance of 25 m, the simulation results, as well as the testing results for the prototype, can reach the illuminance distribution requirements, including all specified regions and key points. Moreover, this compound system enjoys the features of high compactness, high energy efficiency, and feasibility of manufacturing.

Design of a newly projected light-emitting diode low-beam headlamp based on microlenses

“…Researchers are expanding LED's application in automobile front lighting systems [2][3][4][5][6][7][8][9][10][11][12]. The optical systems of traditional projective low-beam headlamps include an LED light source, an ellipsoidal reflector, a baffle, and a converging lens [3][4][5][6]. They usually use a baffle to form the cut-off line required by United Nations Economic Commission for Europe vehicle regulations (ECE) R112 [13].…”

“…Ge et al proposed a low-beam system for an LEDbased headlamp architecture, which was composed of an elliptical reflector, a baffle, and a faceted reflector [5]. But the optical efficiency of the low-beam lamp was 56.35%, still not high enough.…”

Design of an LED-based headlamp low-beam system using combined prisms

“…[4][5][6] Others make use of reflectors and compound structures to shape the required beam pattern. [7][8][9] In this paper, we introduce a new design for LED automotive low-beam illumination systems, which comprises a parabolic reflector, compound lenses and combined prisms. By using a single, highbrightness LED device as the light source, we can get a satisfactory beam pattern on the measuring screen at a distance of 25 m, with a clear cutoff line that complies with the United Nations Economic Commission for Europe (UNECE) regulations.…”

A light-emitting diode headlamp for motorcycles based on freeform micro-lenses

“…1 Researchers have studied the application of LEDs to automobile headlamps. [2][3][4][5][6][7][8][9][10][11] More and more automobiles are now fitted with LED headlamps. We have designed a LED high-beam headlamp based on micro-lenses and a physical model and experimental results have been given.…”