Total-internal-reflection compound secondary optical lens design of LED illumination
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摘要: 二次光学元件是LED照明灯具的关键组成部分，其决定了灯具的光学效率和配光特征。依据斯涅尔定律、边缘光线原理、光束扩展度守恒等原理，根据照明灯具在X、Y方向的非对称配光的要求，提出一种复合曲面的数值设计方法，建立起LED 光源出射光线的角度与照明平面上的照明点的坐标的对应关系。根据对应关系迭代计算出复合曲面上其他点的空间坐标，把点坐标值导入CAD软件进行曲线重构，结合中间的凸透镜，就可以建立全反射复合曲面透镜的三维实体模型。在光学软件中对三维实体模型进行照明模拟，结果表明：通过复合曲面二次光学透镜作用于LED，可以在路面上形成均匀照明的矩形光斑。Abstract: Secondary optics are critical components of lighting emitting diode (LED) luminaries, which determine the optical efficiency and light distribution characteristics of luminaries. Based on Snell-s law, edge-ray principle, energy conservation principle and Etendue conservation principle, we investigated a design methodology using the numerical solutions of a set of first-order partial differential equations to obtain the X,Y coordinates of the total-internalreflection (TIR) compound surface. We established the corresponding relationship between the angle of LED emerging light and the coordinates of target points on the illumination plane. According to the corresponding relationship, we calculated the coordinates of the other points on the compound surface and fitted the points to the three-dimensional entity model by CAD. Then the three-dimensional entity model was imported into optical software to carry out the simulation. The results showed that a uniform rectangular facula on the road surface could be obtained by adopting TIR-compound secondary optical lens on LED.
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