Narrow beam uniform illumination design of COB light source
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摘要: 为了解决高功率白光LED光源输出高均匀度窄光束的问题，设计了一种由复合抛物面反射器、菲涅尔透镜和非球面透镜组成的照明系统。设计中以板上芯片型（COB）集成光源的配光曲线为依据构建光源仿真模型，由复合抛物面反射器实现大角度光线初次会聚之后，再由菲涅尔透镜控制溢散光，最后利用非球面透镜进行准直配光。采用TracePro进行蒙特卡洛光线追迹，根据仿真得到的系统性能指标，并研制出实物装置进行实验测试。最终测试结果表明：窄光束均匀照明系统可以输出±7.9°的光束，并且在距离系统出光面0.7 m左右的区域形成均匀度超过96%的圆形光斑，整体光效达到60%。Abstract: To achieve high-power white LED system with high uniformity and narrow beam, an optical system composed of Chips On Board (COB), compound parabolic reflector, Fresnel lens and aspheric lens is designed. In the design, based on the COB light distribution curve, the light source simulation model of the optical system is built firstly. Then the light source beam is converged by the compound parabolic reflector, and the spill light is controlled by the Fresnel lens. finally, an aspheric lens is used for collimating light source beam. The TracePro software is used for ray tracing simulation. According to the simulated results, an experimental setup is developed for experimental testing. The testing results show that the divergence angle of the optical system is ±7.9°, and the circular uniformity is 96% with the distance of 0.7 m, and the overall light efficiency reaches 60%.
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图 6 COB芯片配光前后坎德拉分布图
Figure 6. Polar candela distribution before and after COB chip light distribution
图 8 offsets变化对于均匀性和能量利用率的影响
Figure 8. Impact of offset changes on uniformity and energy efficiency
表 1 光学系统仿真参数
Table 1. Simulation parameters of optical system
lens material COB diameter/mm simulation wavelength/μm CPC reflectivity/% number of ray traces PMMA 22 0.54 95 500 000 
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