导光均光微槽透镜阵列精密磨削及其热压微成型

发布时间：2018-06-11 20:50

本文选题：微磨削 + 热压微成型　；参考：《机械工程学报》2017年23期

【摘要】：薄壁LED照明依赖丝网印刷的微阵列导光板,但其表面油墨点阵易老化,且微结构很难优化。因此,在导光板表面设计出高斯分布的空间微槽透镜阵列,并采用数控微磨削技术对其进行加工,替代市面丝网印刷的2D微圆阵列。首先,用微光学原理模拟导光板导光效率和出光均匀度,优化微透镜阵列的形状、尺寸和分布。利用金刚石砂轮微尖端在PMMA导光板表面精密磨削出微透镜阵列,检测其导光效率及均匀性。最后,利用微磨削加工的微阵列成型钢模芯开发微透镜阵列的快速热压微成型工艺。微光学分析表明,微槽透镜阵列比微方形透镜阵列和微半球透镜阵列分别提高导光效率6%和15%。而且,微槽透镜阵列变间距高斯分布比等间距分布提高导光效率32%,提高出光均匀度73%。试验结果显示,微磨削可以控制微槽透镜阵列加工的表面质量和形状精度,应用于LED导光板后比丝网印刷的导光板提高导光效率7%和出光均匀度9%。此外,开发3 s的快速热压微成型工艺,可以加工出变间距和变深度的微槽透镜阵列,比丝网印刷的微圆阵列提高照度26%和出光均匀度49%。因此,微空间结构优化的微槽透镜阵列比丝网印刷的2D微圆阵列可附加出更高的微光学应用价值。
[Abstract]:Thin-walled LED lighting depends on screen printing of microarray light guide, but its surface ink lattice is easy to aging, and the microstructure is difficult to optimize. Therefore, the spatial microgroove lens array with Gao Si distribution is designed on the surface of the light guide plate, and the NC micro-grinding technology is used to process it instead of the 2D microcircular array printed in the market screen. Firstly, the efficiency and uniformity of the light guide plate are simulated by using the principle of low light level (LLL), and the shape, size and distribution of the microlens array are optimized. The microlens array was precisely ground on the surface of PMMA light guide plate by diamond wheel micro tip, and its light conduction efficiency and uniformity were tested. Finally, the rapid hot pressing microforming process of microlens array is developed by using microarray formed steel die core. The results of microoptical analysis show that the light conduction efficiency of microgroove lens array is improved by 6% and 15% than that of microsquare lens array and microhemispherical lens array, respectively. Moreover, the Gao Si distribution of the microgroove lens array with variable spacing improves the light conduction efficiency by 32 and increases the light uniformity by 73 compared with the equal distance distribution. The experimental results show that micro grinding can control the surface quality and shape accuracy of microgroove lens array. The light guide efficiency and uniformity of light are increased by 7% and 9% than that of screen printed light guide plate after being applied to LED light guide plate. In addition, a rapid hot pressing microforming process of 3 s can be used to fabricate microgroove lens arrays with varying spacing and depth, which can increase illumination by 26% and light uniformity by 49% compared with those of silk-screen printed microarrays. Therefore, the microgroove lens array with optimized microspace structure can add higher value of low light level than 2D microcircular array with screen printing.
【作者单位】：华南理工大学机械与汽车工程学院;
【基金】：国家自然科学基金(61475046) 广州市科技计划(201508030012) 广东省科技计划(2014B010104003)资助项目
【分类号】：TG596;TS871.1

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