根据LED 光源的辐射特性和照明平面的照度分布要求,利用网格法分配LED 光源的能量,并且与照明平面上的能量小块相对应,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。设定反射器的初始点坐标后,根据对应关系迭代计算反射器的自由曲面上其它点的空间坐标。把点坐标文件导入机械建模软件,并且保持各个点坐标的法向量拟合成曲面实体。在光学软件中对反射器光学系统进行照明模拟,结果说明通过自由曲面反射器作用于LED,可以在目标路面上形成均匀照明的矩形光斑。

According to the radiation characteristics of LED light sources and lighting requirements of illumination distribution,the energy of LED light source is distributed by using grid method,which corresponds with the small energy blocks in the target plane. We can establish the corresponding relationship between the angle of the light exit from LED light source and the coordinates of point in the target plane. According to the corresponding relationship,calculate the free-form reflector points,and by mechanical modeling software,fit the points to surface entity and import the entity into optical simulation software to carry out the simulation. The results illustrate that through the role of reflector cup on the LED,we can get a uniform rectangular facula in the target surface.