Abstract
The study related in this paper is the design of a ship-mounted LED of high brightness and distant spot. The freeform lens design obeying the edge ray principle and Snell’s law is presented first. Then, to fit the illumination requirement of the searchlight, we designed a freeform lens to collimate all the light rays coming from the LED. However, theoretical analysis proves that there is a critical angle for incident rays beyond which the rays cannot be collimated, and 55% is the light-efficiency limit for polymethyl methacrylate freeform lens. We then designed a combination of a freeform lens–coupled parabolic reflector that improved light efficiency to 70%. In this paper, the design of the freeform lens–coupled parabolic reflector is given in detail. In addition, tolerance analysis and the effect of manufacturing defect are presented.
© 2011 Optical Society of America
Full Article | PDF ArticleMore Like This
Chen Chen and Xiaohui Zhang
J. Opt. Soc. Am. A 31(5) 1118-1125 (2014)
Shuang Zhao, Kai Wang, Fei Chen, Zong Qin, and Sheng Liu
Appl. Opt. 52(13) 2985-2993 (2013)
Zheng Zhenrong, Hao Xiang, and Liu Xu
Appl. Opt. 48(35) 6627-6634 (2009)