透镜提升光源使用率（更加聚光），解决散光问题；
The projector lens improves the light utilization (make it more focus) and solves the problem of astigmatism.
对各种LED光源和光学会聚系统进行了对比测试，并对其聚光性能进行了分析，设计了一种全内反射透镜（TIR透镜）结构。
This paper comparably tests different LED light source and optical convergence system, analyzes the condensing performance and designs the structure of TIR lens.
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