摘要
采用CREE XLamp XL-M2 LED封装模块作为光源,应用贝塞尔曲线作为透镜自由曲面,通过光学系统设计软件Lighttools,设计了光束角22°、光通量249. 78 lm、光效83. 26%、最大强度1352. 8 cd的LED透镜组。结果表明:采用贝塞尔曲线设计的透镜光学曲面满足成型精度要求,在相同成型工艺参数条件下,注射压缩成型与注射成型相比,透镜组的翘曲变形范围分别为0. 022 8~0. 198 1 mm和0. 007 6~0. 203 4 mm,透镜组的翘曲变形量减小2. 7%,注射压缩成型和注射成型的透镜组轮廓峰谷的高度变化范围分别为-50~50 nm和-200~0 nm,透镜组的表面粗糙度减小40. 6%,与注射成型相比,成型精度和表面形貌精度均较佳,可以明显提高LED透镜组的光学性能。
Using encapsulated module of CREE XLamp XL-M2 LED as light source and Bessel curve as lens free surface,LED lens group with beam angle 22°,luminous flux 249. 78 lm,photosynthetic efficiency 83. 26% and maximum strength1352. 8 cd was designed through the optical system design software Lightools. The results showed that lens optical surface with Bessel curve met the requirement of processing precision. Warpage deformation range and morphological peak valley height variation of lens group in injection compression molding were 0. 022 8 ~ 0. 198 1 mm and-50 ~ 50 nm respectively,and those in injection molding were 0. 007 6 ~ 0. 203 4 mm and-200 ~ 0 nm respectively. Warpage deformation and surface roughness of lens group in injection compression molding reduced 2. 7% and 40. 6% respectively in comparison with those in injection molding under the same processing parameters. Injection compression molding improved the optical performance of LED lens group by means of the superior of processing precision and surface morphological precision.
引文
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