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• Main Authors: Chien-An Chen, 陳建安
• Other Authors: Wen-Shing Sun
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/4vn229

碩士 === 國立中央大學 === 光電科學與工程學系 === 107 === In this paper we design a vehicle low-beam headlamp by a white LED module to meet the Economic Commission of Europe, Regulation no.112 (ECE R112).The headlamp designed in this study comprises a while LED module, an elliptical reflector, a parabolic reflector, a toric lens, a low-penetration-rate sheet glass and a prism array. The LED lambertian light source with a luminous flux of 146 lumens is located at the first focus of the elliptical reflector. We arranged the focus of the parabolic reflector confocal with the second focus of the elliptical reflector. Then we use non-sequential rays as reference rays to improve the optical efficiency of compound-reflectors system. The light emitted from LED light source became parallel. we arranged a aspheric lens in front of the compound reflectors. we obtain a rectangle and more uniform illumination distribution on the 25-meters measuring screen. Finally, we use the low-penetration-rate sheet glass and the prism array to reach the ECE R112 requirment . The total luminous flux simulated on the 25-meters measuring screen is 96.14 lumens, and the passing beam efficiency is 66%.