基于LED光源的TIR透镜的优化设计

为提高LED光能利用率,设计了一种自由曲面的全内反射(TIR)透镜。根据LED的光能分布特点,通过控制光线路径得到TIR透镜折射面和反射面轮廓曲线上的离散点,利用插值得到样条曲线,再经旋转360°得到TIR透镜的模型。利用Tracepro软件对经TIR透镜的光线进行追迹,根据光能利用率要求优化透镜结构,得到在保持透镜小尺寸的同时,光能利用率为95.26%,光束的发散角控制在±15°以内。

Optimal Design of TIR Lens for LED Light Source

In order to improve the utility rate of luminous energy,a TIR lens with free-form surface is designed.The ray is traced to get the discrete spots on the contour curve of TIR refractive and reflective planes according to the luminous characteristics of LED.A TIR lens model is established with spine curve obtained by interpolation and revolved to 360 degree.The rays passing through TIR lens are traced by Tracepro and the lens structure is optimized based on the utility rate requirement of luminous energy.While keeping the small size for TIR lens,a high utility rate of luminous energy of 95.26% is reached and the angle of divergence of light is controlled to ±15°.