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標題: | 紫外光注塑成型應用於雙面微透鏡陣列製作 Fabrication of Double-sided Microlens Array Using UV Injection Molding |
作者: | Shian-Lung Chen 陳賢龍 |
指導教授: | 楊申語 |
關鍵字: | 雙面微結構,微透鏡陣列,紫外光固化,紫外光注塑製程,熱壓, double-sided microstructure,microlens array,UV curing,UV injection molding,hot embossing, |
出版年 : | 2017 |
學位: | 碩士 |
摘要: | 本研究開發紫外光固化膠注塑成型製程,並利用此製程製作3×3雙面微透鏡陣列。首先製作凹型微透鏡陣列鋁模具,微透鏡陣列與對位標記一併製作在鋁合金基材上。以鋁模具為母模,利用電鑄技術將鋁模具的結構翻製成另一鎳模具,其上為凸型微透鏡,藉由熱壓製程將鋁模具、鎳模具上微透鏡陣列複製到透明PC模仁,其上各有凹型及凸型微透鏡,再將透明PC模仁置於合模對位機台上。由於本研究微透鏡成品為雙面結構,為了對位需求,故建立即時光學對位系統觀測對位標記製作大面積雙面微透鏡陣列。進膠方式是利用氣動式點膠機將紫外光樹脂注入模穴內,充填完畢後,曝光即可得到成品,總製程時間為45秒。於四吋圓面積上製作雙面微透鏡陣列,成品無殘留氣泡;凸透鏡複製率達99.74%,凹透鏡複製率達99.00%。進一步量測成品的均勻性,直徑的標準差為1.3um,高度的標準差為1.5um,顯示出利用紫外光固化膠注塑成型製程製作雙面微透鏡陣列均勻性良好。
本研究進一步量測雙面微透鏡陣列之光學性質,分別量測雙面微透鏡陣列之有效焦距(EFL)、光斑直徑(Spot Size)與光學成像。平均有效焦長為1.686 mm,標準差為0.007 mm,表示利用紫外光注塑法來製作微透鏡陣列的成型性均勻。將原光源為1.2 mm直徑大小縮至僅剩50 um之光斑直徑大小,顯示此雙面微透鏡陣列擁有聚焦性質,而英文字母圖案A經由聚焦後其成像完整清晰。 In this study, we successfully developed the UV-curable injection molding process. By using this process the double-sided microlens array has been fabricated. The microlens array and the alignment marks were first machined on the aluminum block to ensure the machining accuracy and to enhance the alignment accuracy. Next, the aluminum mold with microlens array cavity was transferred to a nickel stamp by electroforming. Then, the patterns on the Ni stamp and the aluminum mold were then transferred to transparent PC molds by the hot embossing. Finally the PC molds were placed on the home-made machine with pneumatic clamp and alignment system. Real-time optical alignment system, composed of CCD and mobile platform, was implemented to observe the marks and to align them. After alignment, the UV-curable resin was injected into the clamped mold cavity by a pneumatic dispenser. After the resin being cured with UV light, double-sided microlens array was fabricated. The cycle time was 45 second. The degree of replication of convex and concave microlens array were 99.74 % and 99.00 % respectively. As far as uniformity was concerned, the standard deviation of diameter was 1.3 μm, while the standard deviation of height was 1.5 μm. In addition, the optical properties of the double-sided microlens array were measured. The average effective focal length was 1.686 mm with a standard deviation of 0.007 mm, indicating the good formability and uniformity. The 1.2 mm diameter in the original light source is reduced to 50 um as the spot diameter. The image of “A’’ patterns are all complete and clear. This study demonstrated the potential of the UV-curable injection molding process with transparent PC molds for fabrication of microlens array and other double-sided microstructure. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/68986 |
DOI: | 10.6342/NTU201703485 |
全文授權: | 有償授權 |
顯示於系所單位: | 機械工程學系 |
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