LED准直器设计中复合抛物面同步多曲面方法

利用非成像光学中流线法和同步多曲面(SMS)法,设计一种具有发散角小、均匀度好和光效高的LED准直器。设计中由复合抛物面(CPC)完成初级配光,将朗伯光源±90°的发散角缩小到±45°,再以SMS法设计的多重自由反射曲面实现准直均匀配光,并由光学扩展量给出准直器的理论光效,最后引入平顶宽度、平顶光效和平顶均匀度等的定义,以更好地反映准直光束质量。光学仿真结果表明,准直器的发散角小于±2.26°,整体光效达到0.79,理论与仿真光效的误差小于2.5%,在0.9平顶宽度范围内光斑均匀度大于等于0.9,平顶光效为0.56,效果良好。

Compound Parabolic Concentrator-Simultaneors Multiple Surfaces Design Methods for LED Collimators

Based on the flow-line and simultaneous multiple surfaces (SMS) design method in nonimaging optics, a design method for LED collimator with low divergence angle, good uniformity and high luminous efficiency is presented. The divergence angle ±90° of a Lambertian source is reduced to ±45° by using the compound parabolic concentrator (CPC) reflector, and then the outgoing lights are collimated by the SMS reflector. A theoretical optical ratio is derived from the entendue of the collimator, and top width, top luminous efficiency and top uniformity are introduced to characterize the quality of the collimated lights. The simulation results show that the divergence of the collimator is less than ±2.26°, the total luminous efficiency is up to 0.79, the luminons efficiency error is less than 2.5% compared with theoretical luminons efficiency, the 0.9 top-flat uniformity is more than 0.9, and the top-flat luminous efficiency is about 0.56, it has good results.