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时间:2020-06-05
《双自由曲面LED均匀照明准直透镜设计.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第43卷第8期光子学报Vo1.43No.82014年8月ACTAPHOTONICASINICAAugust2014doi:10.3788/gzXb20144308.0822003双自由曲面LED均匀照明准直透镜设计孟祥翔一,刘伟奇,冯睿,魏忠伦,周敏。,杨建明。(1中国科学院长春光学精密机械与物理研究所,长春,130033)(2中国科学院大学,北京,100049)(3空军航空大学,长春,130033)摘要:为了克服传统LED准直器在近场难以实现均匀照明的缺陷,设计了一种双自由曲面均匀照明准直透镜.透镜分为折反两部分,每部分都利用双自由曲面进行匀光和准直.根据马
2、吕斯定律,推导了实现光束准直出射的等光程方程,并将切面迭代法加入等光程条件,同步计算准直透镜上下自由曲面的面形数据.仿真分析表明:对1mmX1mm的白光LED芯片,84.55的能量集中在±2。内,近场照度均匀性达到94.59,远场照度均匀性为89.O1;当LED芯片尺寸不超过2.0mm×2.0mm时,±4内的能量利用率大于83.5,近场照度均匀性在90以上.该准直透镜能同时实现近场和远场的均匀照明,公差符合装配要求,光能利用率高.关键词:非成像光学;发光二极管;照明设计;自由曲面;几何光学中图分类号:TN312.8文献标识码:A文章编号:1004—4213(2
3、014)08—0822003—6DesignofLEDCollimatorforUniformIlluminationwithDoubleFreeformSurfacesMENGXiang—xiang,,LIUWei—qi,FENGRui,WEIZhong—lun,ZHOUMin。,YANGJian—ruing’。(1ChangchunInstituteofOptics。FineMechanicsandPhysics,ChineseAcademyofSciences,Changchun,Changchun130033,China)(2UniversityofC
4、hineseAcademy0_厂Sciences,Beijing100049,China)(3AviationUniversityforAirForce,Changchun130022,China)Abstract:ALEDcollimatorwithdoublefreeformsurfaceswasdesignedforuniformilluminationinbothnearfieldandfarfield.Thecollimatorincludesrefractivepartandreflectivepart,andeachparthasdoublefr
5、eeformsurfaces.BasedonMalusLaw,theconstantopticalpathlengthequationsthatrealizetherayscollimatingwerederived.Thenassociatingwithtangent—planeiterativemethod,thedatebothupfreeformsurfaceanddownfreeformsurfacesimultaneouslycouldbecalculated.Thesimulationsshowthat,84.55oftheenergyiscol
6、lectedin±2。for1mm×1mmsizewhiteLEDafterconsideringtheFresnelloss,reflectivesurfaceslossandmaterialabsorbing.Theuniformityinnearfieldis94.59,andtheuniformityinfarfieldis89.01%.Theuniformityinnearfieldandtheopticalefficiencyin±4。areabove9Oand83.5respectively,whiletheLEDchipsizesareunde
7、r2mm×2mm.ItisillustratedthattheLEDcollimatorcanrealizeuniformilluminationinbothnearfieldandfarfieldwithhighlightefficiencyandthetolerancemeettherequirementsofalignment.Keywords:Geometricoptics;Nonimagingoptics;Light—emittingdiodes;Illuminationdesign;FreeformsurfaceoCISCodes:22O.4298
8、;220.2945;220.2740;
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