Design of LED collimator for uniform illumination with double freeform surfaces

	Design of LED collimator for uniform illumination with double freeform surfaces
	Meng X.-X.; Liu W.-Q.; Feng R.; Wei Z.-L.; Zhou M.; Yang J.-M.
	2014
发表期刊	Guangzi Xuebao/Acta Photonica Sinica
ISSN	ISBN/10044213
卷号	43 期号:8
摘要	A LED collimator with double freeform surfaces was designed for uniform illumination in both near field and far field. The collimator includes refractive part and reflective part, and each part has double freeform surfaces. Based on Malus Law, the constant optical path length equations that realize the rays collimating were derived. Then associating with tangent-plane iterative method, the date both up freeform surface and down freeform surface simultaneously could be calculated. The simulations show that, 84.55% of the energy is collected in 2 for 1 mm1 mm size white LED after considering the Fresnel loss, reflective surfaces loss and material absorbing. The uniformity in near field is 94.59%, and the uniformity in far field is 89.01%. The uniformity in near field and the optical efficiency in 4 are above 90% and 83.5% respectively, while the LED chip sizes are under 2 mm2 mm. It is illustrated that the LED collimator can realize uniform illumination in both near field and far field with high light efficiency and the tolerance meet the requirements of alignment.
收录类别	EI
语种	中文
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/43864
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Meng X.-X.,Liu W.-Q.,Feng R.,et al. Design of LED collimator for uniform illumination with double freeform surfaces[J]. Guangzi Xuebao/Acta Photonica Sinica,2014,43(8).
APA	Meng X.-X.,Liu W.-Q.,Feng R.,Wei Z.-L.,Zhou M.,&Yang J.-M..(2014).Design of LED collimator for uniform illumination with double freeform surfaces.Guangzi Xuebao/Acta Photonica Sinica,43(8).
MLA	Meng X.-X.,et al."Design of LED collimator for uniform illumination with double freeform surfaces".Guangzi Xuebao/Acta Photonica Sinica 43.8(2014).

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