Optical design of a Butterfly lens for a street light based on a double-cluster LED

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• 作者：Yi-Chien Lo^a ; ^b ; Kuan-Teng Huang^a ; ^b ; ^c ; Xuan-Hao Lee^a ; ^b ; Ching-Cherng Sun^a ; ^b ; ^{ccsun@dop.ncu.edu.tw}
• 刊名：Microelectronics Reliability
• 出版年：2012
• 出版时间：May, 2012
• 年：2012
• 卷：52
• 期：5
• 页码：889-893
• 全文大小：885 K

文摘

We construct a precise optical model of the cluster LED and propose a design of a peanut form lens to achieve an optical utilization factor of 45 % and uniformity of 1/2.7. Then we propose a new design of so-called Butterfly lens with unequal tilt design aimed to serve a double-cluster LED but with a tightened size. The optical utilization factor of the Butterfly lens is about 43.8 % , the uniformity is around 1/2.7, and an averaged illuminance of 14 lx, which could meet almost all types requested by IESNA. The design of the Butterfly lens is proven workable for a double-cluster LED.