微特征结构对导光板翘曲变形的影响

为研究不同微特征结构对导光板翘曲变形的影响,以导光板翘曲变形为质量目标,利用Moldflow MPI5,首次仿真研究了尺寸规格为11×3×0.8的导光板上5种不同微特征结构阵列(V型凹槽阵列、U型凸槽阵列、金字塔阵列、圆环阵列以及微透镜阵列)在不同工艺参数下对导光板翘曲变形的影响。仿真结果表明,微凸点微结构阵列影响最大,微圆凸点阵列导光板最大翘曲量为0.039 7 mm, 圆环微结构阵列影响最小,相同工艺参数下圆环微结构阵列导光板最小翘曲量为0.028 2 mm,两者相差最大达40.78%,而且凹结构微特征阵列对导光板翘曲量的影响幅度总是小于凸结构微特征阵列。结论认为,在导光板设计阶段就应考虑不同微结构特征对导光板注射成型翘曲变形的影响并优先选用圆环等凹结构微特征阵列,以减少导光板注射成型的翘曲量。

Effects of different micro-feature structures on warpage and deformation of light guide plate

To study the influence of different micro-feature structures on the warpage and deformation of injection molded light guide plate,We applied MoldFlow MPI5.0 to simulate the influence of five different micro-feature structures (micro V groove structure , micro U protrude structure , micro pyramid structure , micro cirque structure and micro lens structure) on the warpage and deformation of light guide plate with 11 mm×3 mm×0.8 mm dimensions for the first time. The results show that the influence of micro lens array structure on the warpage and deformation of the light guide plate is bigger than that of other microfeature structures, the biggest warpage and deformation of micro lens array light guide plate is 0.039 7 mm, and the influence of micro rings array structure is the smallest one. With the same processing parameters,the warpage and deformation of micro rings array light guide plate is 0.028 2 mm, the difference reaches 40.78%, furthermore the influence of convex micro-feature structures is bigger than concave micro-feature structures at all time. It is shown that we should consider the influence of different designs of micro-feature structures on the injection molding of light guide plate in advance, and the preferences are concave micro-feature structures like micro cirque structure.