短波长LED近距离匀光照明系统的设计  

Close-range Uniform Illumination System Design for Short-wavelength LED

作　　者：李燕 杨宇铭 郑怀文[1] 于飞[1] 裴艳荣 杨华[1] 李璟[1] 伊晓燕[1] 王军喜[1] 李晋闽[1] LI Yan;YANG Yuming;ZHENG Huaiwen;YU Fei;PEI Yanrong;YANG Hua;LI Jing;YI Xiaoyan;WANG Junxi;LI Jinmin(Beijing Engineering Research Center for the 3rd Generation Semiconductor Materials and Application, Beijing 100083,China)

机构地区：[1]中国科学院半导体研究所中国科学院半导体照明研发中心中国科学院大学北京第三代半导体材料与应用工程技术研发中心半导体照明联合创新国家重点实验室

出　　处：《照明工程学报》2019年第4期104-108,113,共6页China Illuminating Engineering Journal

基　　金：国家重点研发计划(批准号:2017YFB0403200,2017YFB0403201,2017YFB0403800,2017YFB0403801)

摘　　要：特殊波长的LED在可穿戴医疗、近距离照明等领域具有广泛的应用前景,但是其照射的均匀度和装置的厚度一般为反向关系。迄今为止,这一问题仍然是影响可穿戴设备所需要的近场光照度分布的一个重要因素,对于较短波长没有适用的匀光板材料的情况更是如此。我们采用了成本较低的蓝宝石磨砂工艺与内部漫反射的灯筒相结合,对基本的蓝宝石参数,包括磨砂面方向、蓝宝石直径、蓝宝石的位置等进行优化,通过磨砂蓝宝石和灯筒内部对光线的散射作用,当h1=5mm、h2=7mm时,仿真得到厚度为1cm、直径为4cm灯筒的照度均匀度最高达到了0.68,获得可接收的光分布性能和能量利用率。LEDs with specific wavelength are prospective for various applications in fields of wearable medical care and short-distance lighting, while the uniformity of irradiation and the thickness of the device are generally of an inverse relationship. To date, this problem is still an important factor for the near-field illumination distribution especially for wearable devices with a shorter wavelength due to the lack of suitable light homogenizing board materials. We employ the sapphire surface grinding treatment which has a lower cost, combined with the lamp housing with internal diffuse reflection. The basic parameters including the direction of frosted surface, the diameter and the location of sapphire, have been optimized. By means of the light scattering effect brought about by the ground sapphire and the inside of the lamp housing, it is found that when h 1=5 mm, h 2=7 mm, the highest intensity of illumination evenness which the lamp housing with a thickness of 1 cm and a diameter of 4 cm can achieve is up to 0.68, and acceptable performance of light distribution and energy utilization rate is obtained.

关 键 词：短波长 均匀度 光照度 近场 LED 

分 类 号：TM923[电气工程—电力电子与电力传动]