A rapid hot embossing of micro-arch array LGP and micro-optics application

Jin XIE; Yu-ning JIANG; Kuo LU; Man-feng HU

doi:10.3788/OPE.20172509.2421

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A rapid hot embossing of micro-arch array LGP and micro-optics application

Micro/Nano Technology and Fine Mechanics | 更新时间：2020-08-13

- A rapid hot embossing of micro-arch array LGP and micro-optics application
- Optics and Precision Engineering Vol. 25, Issue 9, Pages: 2421-2427(2017)
- 作者机构：
  
  华南理工大学机械与汽车工程学院, 广东广州 510640
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20172509.2421
  CLC： TB853.29
- Received：18 January 2017，
  
  Accepted：16 March 2017，
  
  Published：25 September 2017
- 稿件说明：
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Jin XIE, Yu-ning JIANG, Kuo LU, et al. A rapid hot embossing of micro-arch array LGP and micro-optics application[J]. Optics and precision engineering, 2017, 25(9): 2421-2427.
DOI：

Jin XIE, Yu-ning JIANG, Kuo LU, et al. A rapid hot embossing of micro-arch array LGP and micro-optics application[J]. Optics and precision engineering, 2017, 25(9): 2421-2427. DOI： 10.3788/OPE.20172509.2421.

摘要

微透镜阵列热压精密成型需要时间保温，生产效率较低。因此，提出在模芯加热表面的微沟槽阵列上对聚合物导光板进行热压，使工件热变形的微米尺度表面层流入微沟槽空间内，快速形成微拱形透镜阵列，而保证工件主体不变形。目的是实现高效率和低能耗的微光学透镜阵列热压成型加工。首先，针对导光板表面的微阵列结构和尺寸分析其微光学性能；然后，使用微磨削技术在模芯表面加工出高精度和光滑的微沟槽阵列结构；最后，研究微拱形阵列的快速精密成型工艺及微光学应用。微光学分析显示，微阵列的高度和分布密度对出光面的光照度影响较大。热压工艺实验结果表明，采用深度为104 μm和角度为121°的微沟槽阵列模芯，在12 MPa的压力和110 ℃的温度下，可以在3s内将高度为50 μm的3D微拱形阵列导光板快速精密热压成型。本文方法制作的87 mm×84 mm的导光板，与市面具有2D点阵且高度为8.2 μm的丝网印刷导光板相比，光照度提高了21%，光照均匀度提高了27%。本文研究将促进微光学精准设计和制造在LED照明产业的应用。

Abstract

The precision hot embossing of microlens array needs heat preservation time

leading to poor efficiency. Hence

a rapid hot embossing of micro-arch array on polymer light guide plate (LGP) is proposed using a heated microgrooved die core. It only performs a thermal deformation for micro-scale surface layer flowing inside microgroove spaces without changing macro workpiece sizes. The objective is to develop the hot embossing process of microlens array of micro-optics with high machining efficiency and low energy-consumption. First

the micro-optics performances of LGP are analyzed with regard to the shape and size of micro-arch array; then the micro-grinding is employed to machine precision and smooth microgroove array on steel die core; finally

the rapid and accurate forming process of micro-arch array and its micro-optics application are studied. The micro-optics analyses show that the height and distribution density of micro-arch array greatly influence the micro-optics performance. The hot embossing experiments show that by using a microgroove array die core with an average groove depth of 104 μm and an average groove angle of 121°

the 50-μm-height 3D micro-arch array may be precisely formed in 3 s in the case of 12 MPa in loading pressure and 110 ℃ in loading temperature. Compared with the general screen-printing 2D micro-dot array with 8.2-μm-height

the LGP patterned with micro-arch array increases the LGP irradiance intensity by 21% and its uniformity by 27%

respectively. It contributes to the micro-optics precision design and fabrication applied for LED lighting industry.

关键词

Keywords

references

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