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Optimized design of LED freeform lens for uniform circular illumination

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Journal of Zhejiang University-Science C(Computers and Electronics) 2012年第12期13卷 929-936页

作者： Peng LIU Reng-mao WU Zhen-rong ZHENG Hai-feng LI Xu LIU State Key Laboratory of Modern Optical Instrumentation Zhejiang University Hangzhou 310027 China

An optimization method is proposed for designing an LED freeform lens which produces a uniform circular pattern with high energy *** method is composed of three main aspects:design of the initial guess,parameterization of the freeform surface,and construction of the merit *** initial guess is created by solving an ordinary differential equation *** approach of selecting optimization points is introduced for parameterization of the freeform *** merit function is constructed by use of the irradiance uniformity and the efficiency of the *** examples are given,and the results show that the irradiance distribution is well controlled with a maximum uniformity(the relative standard deviation of irradiance,RSD) of 0.0122 and a maximum efficiency of 93.88%.This optimization method can be generalized to design freeform lenses with different lighting patterns or without rotational symmetry.

关键词： illumination design Lenses Light emitting diode(LED) Non-imaging optics

Ray targeting for optimizing smooth freeform surfaces for LED non-rotational illumination

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Journal of Zhejiang University-Science C(Computers and Electronics) 2013年第10期14卷 785-791页

作者： Reng-mao WU Peng LIU Ya-qin ZHANG Zhen-rong ZHENG Hai-feng LI Xu LIU State Key Laboratory of Modern Optical Instrumentations Zhejiang University

We propose an effective optimization method for generating smooth freeform surfaces for light-emitting diode(LED)non-rotational illumination based on ray *** method begins with a starting design and goes through two optimization *** initial estimate is determined using a partial differential equation(PDE)method and a variable separation *** the first optimization step the merit function is developed with ray targeting to ensure the shape of the illumination *** purpose of the second optimization is to further improve the optical performance by constructing the merit function with uniformity and *** freeform reflective and refractive surfaces,which can produce a uniform rectangular illumination without rotational symmetry,are designed using this *** results show that uniform rectangular illumination is achieved and that smooth freeform surfaces are *** ray targeting,the design efficiency can be significantly enhanced,and excellent optical performance can be achieved.

关键词： illumination design Freeform surface Non-imaging optics Computation methods

Simple dynamic energy core equivalent rays method to design freeform surface for extended source

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Frontiers of Optoelectronics 2016年第2期9卷 330-337页

作者： Kun WANG Yanjun HAN Hongtao LI Yi LUO Zhibiao HAO Lai WANG Changzheng SUN Bing XIONG Jian WANG Tsinghua National Lab on Information Science and Technology Department of Electronic Engineering Tsinghua University Beijing 100084 China

A simple method is proposed to design free- form surface for Lambertian extended source. In this method, it can take advantage of the designing method for point source via substituting each incident ray with a dynamically calculated equivalent ray. For each facet on the freeform surface, the equivalent ray emits from the energy weighted average-emitting-position for the corre- sponding incident beam, and redirects into the direction which is determined by a source-to-target mapping. The results of the designing examples show that the light distributions＇ uniformities can be improved by this method, e.g., even the improvement of 59% can be achieved.

关键词： nonimaging optics illumination design lightemitting diodes (LEDs)

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利用环带法计算灯具效率和绘制配光曲线

水电站设计 1996年第2期 20-25页

作者： Xin Bijun Yu Zhilong (Northeast China Investigation and design Research Institute,Changchun,130021)

利用环带法计算灯具效率和绘制配光曲线辛碧君于志龙（东北勘测设计研究院，长春，１３００２１）１前言我国照明设计遵循国家颁布的《工业企业照明设计标准》进行照度计算，而照度计算的主要依据是所选用灯具的配光曲线（即光强分布曲... 详细信息

利用环带法计算灯具效率和绘制配光曲线辛碧君于志龙（东北勘测设计研究院，长春，１３００２１）１前言我国照明设计遵循国家颁布的《工业企业照明设计标准》进行照度计算，而照度计算的主要依据是所选用灯具的配光曲线（即光强分布曲线）和灯具效率。可是，目前我国各灯...

关键词： Ring Band Method illumination design light adjusting curve efficiercy.