板上芯片型LED光源均匀照明自由曲面透镜设计  

Design of Freeform Surface Lens with Chip on Board LED Sources for Uniform Illumination

作　　者：梁文跃[1,2] 李远兴[1] 龙拥兵[3] 申冬玲[1] 茹达兴 凡利娟 谢凯彬[1] 

机构地区：[1]五邑大学应用物理与材料学院,广东江门529020 [2]五邑大学数学与计算科学学院,广东江门529020 [3]华南农业大学电子工程学院,广东广州510642

出　　处：《激光与光电子学进展》2017年第1期211-218,共8页Laser & Optoelectronics Progress

基　　金：广东省自然科学杰出青年基金(2014A030306005);广东省高等学校人才引进专项(粤财教[2013]246;江财教[2014]10);广东省高等学校优秀青年教师培养计划项目(粤教师函[2014]108);广东省科研创新团队(2015KCXTD027);江门市科技计划项目(江财工[2012]156;江科[2014]145);大学生创新创业训练计划项目(教高司函[2014]58;粤教高函[2014]132)

摘　　要：提出了基于能量映射关系和易加工性约束的照度偏离量累加反馈优化算法,并设计了一款可实现照度均匀分布的基于板上芯片(COB)型发光二极管(LED)光源的自由曲面透镜。本算法将每次迭代反馈优化后的仿真光分布与目标光分布的照度偏离量,累加到预设目标光分布进行修正,并利用修正后的目标光分布结合能量映射关系重构自由曲面透镜模型;同时,从易加工性的角度提出在反馈优化过程中将透镜外曲面下半部分约束为竖直面。以Cree CXA1816COB LED为光源设计了相应的自由曲面透镜,结果表明,经过3次反馈优化后即可在距离光源1000mm、半径为1480mm的圆形区域实现均匀照度分布。根据设计结果加工了相应的透镜并进行照明效果的测试,实测的照度分布与仿真结果比较吻合。A cumulative feedback optimization algorithm based on illumination deviation restrained by energy mapping relationship and easy processability is proposed, and a freeform surface lens with uniform illumination distribution and light emitting diode （LED） of chip on board （COB） as light source is designed. In this approach, the new target light distribution is modified by accumulating the illumination deviation after each iterative feedback optimization between the simulation light distribution and the target light distribution to the presupposed target light distribution. The target light distribution after modification is then used to reconstruct the model of the freeform lens by combining the energy mapping relationship. Meanwhile, to make the designed lens easier to be molded and processed, the structure of the lens is modified by restraining concave plane of the lower half of lens into vertical plane in the feedback optimization progress. With this method, the corresponding freeform lens is designed with Cree CXA1816 COB LED as light source. The results show that the uniform illumination distribution in a circular region with a distance of 1000 mm from light source and a radius of 1480 mm can be achieved after 3 times feedback optimization. Finally, according to the design results, the corresponding lens is fabricated, and the illuminationeffect is tested. Actual measured illumination of the lens is consistent with the simulation results.

关 键 词：光学设计 非成像光学 板上芯片型发光二极管 自由曲面 反馈优化 均匀照明 易加工性 

分 类 号：O439[机械工程—光学工程]