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首页> 外文期刊>Optical engineering >Freeform surface design for a light-emitting diode-based collimating lens
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Freeform surface design for a light-emitting diode-based collimating lens

机译：基于发光二极管的准直透镜的自由曲面设计

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摘要

A freeform collimating lens is designed to project light rays emitted from an LED light source to a far target plane. Generally, the projection distance is assumed to be more than 100 m, and the light beam to have negligible divergence. The lens consists of a total internal reflection (TIR) side surface, a spherical surface in the rear, a vertical plane surface in the outer part of the front, and a freeform refractive surface in the central part of the front. Light rays emitted from the LED source with large spread angles hit the TIR surface and are redirected parallel to the light axis, and those having small spread angles will be collimated by the freeform refractive surface, which is designed with a simple approximation method, and then travel parallel to the light axis. Computer simulation results show that an optical efficiency of 81.5% is achieved under a view angle of ±5 deg and for a 1 mm × 1 mm LED source.
机译：自由形式的准直透镜被设计为将从LED光源发射的光线投射到远处的目标平面。通常，假设投影距离大于100 m，并且光束的发散可忽略不计。透镜由全内反射（TIR）侧面，后部的球面，前部的外部的垂直平面和前部的中部的自由曲面构成。从LED光源发出的具有大发散角的光线撞击TIR表面，并平行于光轴重定向，而具有小发散角的光线将通过采用简单近似方法设计的自由形折射面进行准直，然后平行于光轴行进。计算机仿真结果表明，对于±5度的视角以及1 mm×1 mm的LED光源，其光学效率为81.5％。

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