注射压缩成型LED透镜光学性能分析

针对注射压缩成型的发光二极管（LED）透镜，采用L18(37)正交实验矩阵及模拟优化获得A3B2C2D2E2F3G1最佳成型工艺参数组合，并对透镜进行了光学性能测试。结果表明，工艺参数中的压缩速度增大和注射速率降低，透镜的内部残余应力和折射率变化减小而光学性能提高；采用热流道注射压缩成型的透镜与冷流道的相比，折射率变化降低，冷流道透镜的透光率和最大光强为93.1 %和590.3 cd，热流道透镜的的透光率和最大光强为97.5 %和665.3 cd，热流道透镜的透光率和光强分别比冷流道的提高4.4 %和75 cd，热流道注射压缩成型加工的LED透镜在光学性能方面比冷流道的优越。

Analysis of Optical Performance for Injection-compression-molded LED Lens

The optimal processing parameters of A3B2C2D2E2F3G1 for the injection-compression molding of LED lens were obtained by simulating optimization using an orthogonal experiment matrix of L18(37), and the optical performance of the lens was evaluated. The results indicated that the reduction of interior residual stress and refractive index variation of lens is beneficial to the improvement of optical performance under the processing parameters of high compression speed and low injection rate. The refractive index variation of molded lens with hot runner was lower than that with cold runner. The light transmittance and maximum light intensity obtained with cold runner were 93.1 % and 590.3 cd, respectively, but both of them with hot runner were 4.4 % and 75 cd higher than those with cold runner. The injection-compression molding for LED lens with hot runner was superior to that with cold runner in the aspect of optical performance.