title: Optical design of an LED motorcycle headlamp with compound reflectors and a toric lens.
abstract: An optical design for a new white LED motorcycle headlamp is presented. The motorcycle headlamp designed in this study comprises a white LED module, an elliptical reflector, a parabolic reflector, and a toric lens. The light emitted from the white LED module is located at the first focal point of the elliptical reflector and focuses on the second focal point. The second focal point of the elliptical reflector and the focal point of the parabolic reflector are confocal. We use nonsequential rays to improve the optical efficiency of the compound reflectors. The toric spherical lens allows the device to meet the Economic Commission of Europe, regulation no. 113 (ECE R113). Furthermore, good uniformity is obtained by using aspherical surface optimization of the same toric lens. The reflectivity of the reflector is 95%, and the transmittance of each lens surface is 98%. The average deviation of the high beam is 14.17%, and the optical efficiency is 66.45%.
authors.forename: Wen-Shing
authors.initials: WS
authors.lastname: Sun
authors.forename: Chuen-Lin
authors.initials: CL
authors.lastname: Tien
authors.forename: Wei-Chen
authors.initials: WC
authors.lastname: Lo
authors.forename: Pu-Yi
authors.initials: PY
authors.lastname: Chu