Study of Reconstruction of Sharp Cut-off line for a Disqualified LED Headlight

• Main Authors: Tung Wu, 吳同
• Other Authors: Ching-Cherng Sun
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/6e93n3

碩士 === 國立中央大學 === 光電科學與工程學系 === 107 === In this thesis, the space limit of the secondary optical mechanism in the optic design has been extensively explored with the commercial high power white LEDs which follow the German StVZO regulations (K-mark) and the European ECE regulations (E-mark - CLASS B). According to these regulations, a dark area of illuminance less than a certain value is required to present above the cutoff line of the projecting light pattern. Within a limited space for optical design, the resulting projecting light patterns through the secondary optical mechanism will become very dizzy. As a result, the illuminance of the dark area goes too high and fails over the regulations. We have proposed a practical process to trace out the source of stray lights from the reflector by simulation and eliminated the stray lights by alternative optimization. In the meantime, the concept of point source tracking and eyes imaging system is also developed for a more precise primary optic design of a complex lighting system. In such a way, the sources of stray lights can be easily traced out, and then eliminated as to follower the regulations.