Etendue-preserving mixing and projection optics for high-luminance LEDs, applied to automotive headlamps

Abstract

By having a single optical element combine the light of several high luminance LEDs, a high luminance light source can be formed, with shape and emission characteristics adaptable to nearly all illumination problems. The illuminance distribution of this virtual source facilitates the generation of the desired intensity pattern via its imaging-stye projection into the far field. This projection is achieved by one refractive and one reflective freeform surface, both calculated simultaneously by the 3D SMS method, which is herein demonstrated for an LED automotive headlamp.

A review on light-emitting diode based automotive headlamps

“…The suggested optical design methods mainly include the traditional optics [56], pixel lighting [57] where the target beam pattern is divided into multiple blocks and each LED illuminates one block, and non-imaging optics [28] including simultaneous multiple surface (SMS) method [58], 3D-tailoring, automatic optimization, and virtually reflecting/refracting surfaces (VRS). The properties of these methods are summarized in Table 5, and special attention should be paid to the types of light sources: point-, line-and matrix-type, because the available LED array module, OPMC, MPMC, or MPML as stated in Section 3.1, usually can be considered as one of the important factors contributing to a good design.…”

Design of an optical lens combined with a total internal reflection (TIR) freeform surface for a LED front fog lamp

“…LED has been widely used in automobile headlights, especially in the low beam and high beam headlamps [1][2][3][4][5][6][7][8][9][10], but few literatures have been reported about the high-power with small compact LED for front fog lamps. Reference [11] has disclosed a front fog lamp for a vehicle.…”

Design method of a light emitting diode front fog lamp based on a freeform reflector

“…LEDs have been widely used in automobile front headlamps, especially in low-beam and high-beam headlamps [7][8][9][10][11][12][13][14][15][16]. However, there are few literatures reported on high-power LED front fog lamps with a small and compact size.…”