摘要
为满足高亮度发光二极管(LED)的准直照明要求,克服传统LED准直镜径长比过大、结构厚重的缺点,设计了小径长比、结构紧凑以及高度准直的LED准直系统。准直镜设计基于LED为理想点光源,光线在准直镜内部经历了两次反射,根据几何光学的等光程原理和折、反射定律,通过数值求解等光程方程组获得准直镜各个面型的轮廓曲线,系统径长比为0.1。利用TracePro软件对所设计的准直系统进行光线追迹模拟,结果表明,光源为理想点光源时,在Φ50mm的出光口径处,光线经准直镜出射的光束发散角(光强半值角)为5.4°;光源采用实际高亮度白光LED时,光线经准直镜出射的光束发散角变为6°,在距准直镜1m处接受屏上,Φ60mm光斑照度均匀性为92%,光效为52.11%,适用于高亮度LED准直照明领域。系统设计实现了结构紧凑,准直性能高的设计目标,系统公差满足装配要求,为大功率高亮度LED准直照明系统的小型化、简单化提供了一种有效的解决途径。
In order to meet the requirements of collimating illumination for high-brightness light-emitting diode （LED） and overcome the shortcomings of traditional LED collimator′s large aspect ratio and heavy structure, a novel collimator with small aspect ratio, compact structure and high collimation is presented. The design of collimator is based on the assumption that the LED source is ideal point source. The rays are reflected twice in the collimator. According to the theory of the constant optical path length and the refraction law in geometric optics, the profiles of collimator′s surface are obtained through numerical solution of the constant optical path length equations, and the aspect ratio is 0.1. Using the optical software TracePro, the collimator system is traced and simulated. The results show that the divergence angle （full angular width of the radiation pattern at the half intensity） is just 5.4° for a point source with the diameter of exit aperture is 50 mm; but it changes to 6° for an actual high brightness white LED, and the irradiance uniformity and the optical efficiency within a diameter of spot 60 mm are 92% and 52.11% at 1 m respectively, which is suitable for the illuminating area of light brighteness LED. The design realizes the objectives of compact structure and high collimation, and the tolerances meet the requirements of alignment, which provides an effective way for realizing the illuminating system′s miniaturization and simplification.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2011年第12期194-199,共6页
Acta Optica Sinica
基金
国家973计划(2010CB227101)
中科院三期创新项目资助课题
关键词
几何光学
高亮度发光二极管
照明
准直镜
发散角
geometric optics high-brightness light-emitting diode illumination collimator divergence angle
