一种实现大功率LED均匀照明的投射器设计

以特定区域的均匀照明为目标，设计一种以单粒LED为光源的均匀投射系统。根据LED的发光特性以及能量守恒定律选择采用折射 全反射(TIR)光学系统，通过建立TIR折射面及全反射面轮廓曲线上的点所满足的常微分方程，利用Runge Kutta求解常微分方程得到轮廓曲线上点的坐标，再在UG中对坐标点进行曲线拟合得到轮廓曲线，进而得到TIR模型及适合数控加工的面形数据。将TIR模型导入Tracepro并对投射系统追迹光线。模拟结果表明：目标平面的光照均匀度达到92.6%，系统的效率达到91.8%。

Design of uniform illumination projector with high power LED

A uniform projection system with a single LED as light source was designed for the purpose of the uniform illumination in a designated region. An optical system with refraction and total internal reflection (TIR) was proposed according to the luminous characteristic of LED and the law of energy conservation. The ordinary differential equations satisfying the spots on the contour curve of TIR refractive and reflective planes were established. The coordinates of points on profile curves were obtained by solving these ordinary differential equations using Runge-Kutta method. The profile curves were acquired by curve fitting of the coordinate spots with software UG, and then TIR model of the projector and data of the surface shape suitable for NC manufacture were obtained. The TIR model of the projector was introduced into Tracepro, and rays were traced. The results show that the illumination uniformity of the illuminated region is better than 92.6%, and the efficiency of the whole system is more than 91.8%.