摘要： 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 14lx, which could meet almost all types requested by IESNA. The design of the Butterfly lens is proven workable for a double-cluster LED. 出版者： Elsevier Ltd 出版日期： 2012-05 出處： Microelectronics and reliability, 2012-05, Vol.52 (5), p.889-893 資源來源： ScienceDirect - Freedom Collection 版權： 2011 Elsevier Ltd 識別號： ISSN: 0026-2714 識別號： DOI: 10.1016/j.microrel.2011.04.007
