Polarizing method, manufacturing method of spreadlight lens and spreadlight lens

According to the polarization method, a TIR lens is arranged in front of a light source, the TIR lens is provided with a beveled light surface, and a microstructure is arranged on the beveled light surface; the microstructure is used for total reflection and refraction, so that light of the light source is totally reflected when passing through the TIR lens, and the totally-reflected light is totally reflected and deflected when passing through the microstructure; the polarizing lens is formed by arranging a beveled light surface on a TIR lens and arranging a microstructure on the beveled light surface, and then polarization is achieved; in order to obtain a spreadlight lens, a micro-structure can be obtained in a removal or increase manner after the optical surface is beveled on the TIR lens. 一种偏光的方法及偏光透镜，偏光的方法为光源前设置TIR透镜，TIR透镜设置斜切光表面，斜切光表面上设置微结构；微结构用于全反射和折射，使光源的光线经TIR透镜时全反射，全反射后的光线经过微结构时全反射而偏转；而偏光透镜采用TIR透镜上设置斜切光表面，并在斜切光表面上设置微结构，然后实现偏光；为了得到偏光透镜，可以在TIR透镜上斜切光表面后，采用去除或增加的方式得到微结构。