LED扩展光源均匀照明的透镜设计  

Lens Design with Uniform Illumination of the LED Extended Sources

作　　者：陈俄振[1] 郭震宁[1] 智佳军[1] 

机构地区：[1]华侨大学信息科学与工程学院,福建厦门361021

出　　处：《华侨大学学报（自然科学版）》2013年第6期632-635,共4页Journal of Huaqiao University(Natural Science)

基　　金：福建省自然科学基金资助项目(2010J01338);福建省科技计划重点项目(2009H0034);福建省厦门市科技计划重点项目(3502Z20093033)

摘　　要：提出一种用发光二极管(LED)扩展光源设计旋转对称透镜的简易方法,并建立旋转对称的光学模型.根据边缘光线原理,反向延长扩展光源边缘与透镜边缘的光线交于一点,定义该点作为点光源,并结合Snell折射定律矢量形式和逐次逼近法,建立光源与接收面的对应关系.设定透镜自由曲面的初始点坐标,用Matlab软件逐一算出其余各个点坐标,最后连接各个点成为透镜的自由曲面,通过Light Tools光学软件建模与蒙特卡罗光线追击.结果表明:此方法设计出的旋转对称透镜可在1m距离处,实现半径为578mm的均匀圆形光斑.This paper propose a simple design method for rotationally symmetric lens which use light-emitting diode （LED） extended sources and establish the rotationally symmetric optical model. According to the edge-ray theory, re- versedly extend the ray lines of the surce edge and the lens edge to intersect at one point, then define this point as point source. Combining with the snell law of refraction in vector form and the successive approximation method, establish the corresponding relation between the light source and the receiving surface, then set the initial point position of the lens free-form surface,and calculate out the other points position by matlab software,at last, connect all the points in turn and form the lens free-form surface. Through the Light Tools software modeling and ray tracing by monte carlo theory, the results show that the method of designing the rotationally symmetric lens can realize a uniform circular facula which redius is 578 mm in the 1 m distance to the lens.

关 键 词：光学设计 发光二极管 扩展光源 透镜 边缘光线原理 

分 类 号：TN312.8[电子电信—物理电子学] O439[机械工程—光学工程]