LED阵列光源的舞台灯变焦透镜系统

 针对国内大功率LED阵列光源舞台灯具在光束角度不可变和光能利用效率低等问题,提出利用透镜组变焦原理来设计阵列光源变焦透镜系统。基于透镜组变焦原理设计了单颗LED光源的变焦透镜组，高级光学系统分析模拟软件ASAP的计算结果显示：调焦范围为0~10 mm时，出光角度（1/10峰值角）的变化范围为18.5°~38.7°，光能利用效率在调焦距离为10 mm时达到78%以上。在此基础上，将单颗LED光源的变焦透镜组扩展为Red、Green、Blue各12颗共36颗LED的变焦透镜系统，进一步分析36颗LED阵列光源在不同排布方式下的出光角度及混色效果。ASAP计算结果显示：在调焦范围与单颗LED相同的情况下，LED阵列光源变焦透镜系统的出光角度（1/10峰值角）的变化范围为21°~38.6°，且3种颜色LED交叉排列的混色效果较好。由LED阵列的计算结果可知，与国内现有的大功率LED舞台灯具相比，在出光角度的变化范围和光能利用效率方面都得到了提高。

Zoom lens system of stage lighting with LED array

Aiming at the problems of the unchangeable beam angle and the low light utilization efficiency of the domestic high-power LED array stage lighting, a zoom lens system with array source was designed. Firstly, a zoom lens group with single LED source was designed with 18.5°~38.7°beam angle (1/10 peak angle ) when the focal range was 0mm~10 mm, and the light utilization efficiency was more than 78% when focal length was 10 mm. Secondly, the zoom lens group with single LED source was extended to a zoom lens system with 36 LED sources (12 red LEDs, 12 green and 12 blue), the beam angle and the color blending effect were analyzed at different arrangements of LED array. The results show that with the same focal range as the single LED, the beam angle range (1/10 peak angle) is 21°~38.6°, and the more uniform the arrangement of different color LED is, the better the color blending effect is. Compared with the existing domestic high power LED stage lighting, this new zoom lens system has improvements in both beam angle and light efficiency.