提出了一种用于LED准直照明的非球面透镜设计方法，该方法产生于对非球面几何光学特性分析和粒子群优化算法优越的寻优能力。用该方法设计了一个基于点光源准直的出光口径30 mm的非球面透镜，为了证明准直透镜的准直效果，用光线追迹方法模拟了准直透镜对于点光源的准直过程。模拟结果显示，点光源经准直透镜后出射光线的最大半视场角为0.004 60，0.8 mm×0.8 mm LED光源经准直透镜后出射光线的最大半视场角为4.91°，表明了粒子群算法用于非球面准直透镜设计的可行性和有效性。与现有的设计方法相比，该设计方法意义更直观，实施更简单。

An aspheric lens design method was presented for an application to LED collimating illumination. The method was derived from a basic geometric-optics analysis and the powerful optimization capability of particle swarm method. By using this method, a highly collimating aspheric lens based on a point source was designed. To verify the practical performance of the collimating lens, a ray-tracing method was employed to trace light rays emitted from an ideal point light source through the collimating lens. The simulation results show that the lens works well with an ideal point and the maximum half view angle of light rays emitted from the lens is 0.004 60, for a 0.8 mm×0.8 mm LED source, the maximum half view angle of light rays emitted from the lens is 4.91°, which manifests the feasibility and effectiveness of Particle Swarm Optimization(PSO) algorithm applied to designing aspheric collimating lens. Compared with the conventional design method, this design approach is more intuitive and easier to implement.