中文摘要：

针对集成光源难以实现小发光角的问题，提出了一种大功率COB光源实现窄光束的设计方法。根据COB光源的出射光分布以及预设的光分布范围选用折射-折射（RR）系统。以选定的COB光源的光谱分布及配光曲线为标准建立光源模型，由复合抛物面（CPC）实现朗伯光源60°的聚光之后，再利用光学扩展量守恒以及同步多曲面方法（SMS）求得透镜前后两个曲面轮廓上点的坐标，进行曲线拟合获得轮廓曲线，进而得到透镜的三维模型。采用光学仿真软件对系统进行光线追迹，结果表明：系统在出光口处的发散角控制在30°之内，半光强度角为11.336°，整体光效达到89.398%，效果良好。

英文摘要：

For integrated light source cannot be easily realized with small emitting angle, a method of designing narrow beam for high-power COB light source is proposed. According to light distribution of the source and the desired light distribution of emergent rays, an optical system with Refraction-refraction（R-R） was chosen. The source model was established based on spectral distribution and relative intensity of the chosen COB light source, and then the divergence angle of a Lambertian source was reduced to 60° by using the Compound Parabolic Concentrator（CPC）. Points on profile curves of the front surface and the behind surface of the lens were obtained with the extended conservation law and the Simultaneous Multiple Surface （SMS）. Profile curves were obtained by curve fitting with these points, and then the lens model was established with three-dimensional software. The optical system was simulated with ray-tracing software. The results show that the divergence angle of the system is controlled within 30° in the optical port, the angle of the half of light intensity is 11.336°, and the total luminous efficiency is up to 89.398%.