臺灣大學: 機械工程學研究所施文彬鍾泊耕Chung, Po-KengPo-KengChung2013-04-012018-06-282013-04-012018-06-282010http://ntur.lib.ntu.edu.tw//handle/246246/256133當人看一物體時，藉由屈調來對焦到不同遠近的物品上。人眼的對焦系統是由水晶體，睫狀肌和連接前面兩者的睫狀纖毛。根據Helmholtz的理論，當環形的睫狀肌收縮時產生的位移，透過睫狀纖毛的結構給予水晶體一外力，使水晶體外型改變。外表輪廓的改變造成的水晶體本身屈光度的改變。 氧化鋁薄膜為一佈滿奈米級孔洞的膜，本論文並利用此為作為基板，蒸鍍上聚對二甲苯高分子，氧化鋁薄膜上的洞因而填滿聚對二甲苯。將氧化鋁薄膜蝕刻後，剩下一層有纖毛結構的膜。本論文將此膜和已完成的軟性透鏡結合，變製作出仿人眼對焦的機構。為了得知環繞在水晶體周圍的纖毛之功用，我們假設纖毛結構接合較平板接合有更高的機械強度，本論文引用一些力學模型來說明此假設。本論文製做了一個測試平台來驗證，一個微纖毛結構和一聚雙甲基矽氧烷平面作接合，另一對照組為普通的平面接合。本論文發現纖毛狀接合的抗拉強度三倍於平面間的接合力，證明的平面間的接合易於受到裂縫影響機械性質，間接解釋了人眼以纖毛結構來連接水晶體和睫狀肌的原因。When people stare on an object, different distances of the object will cause the lens accommodation of human eye to focus on this object. The human’s focusing mechanism is composed of a ring of zonular fibers connecting the ciliary muscle to the lens of the eyes. According the Helmholtz’s theory, when the ciliary muscle ring contracts, the displacement generates force on the lens through the zonular fibers and hence the contour of the lens changes. This shape change causes the power change of the lens. In this study, we demonstrated humanoid focusing mechanism that consists of parylene nanofibers and soft polymer lens. Anodic aluminum oxide (AAO) is a film with arrays of nano-scale holes and used as a template to evaporate parylene C. The holes on the AAO was gradually filled with parylene during the deposition process. By etching the AAO, the parylene membrane with fibrillar structure was then obtained. By assembling this fibrillar membrane with pre-made soft lens and actuator, a bio-inspired lens accommodation system was completed. For verifying the function of the fibrillar structure around the lens, we assumed that fibrillar structure has the stronger tensile strength than a plane surface. Using simple mechanics models, we found that the plane surface was prone to form crack than the fibrillar structure. An experiment stage was set up to test the tensile strength and to compare two bonding conditions. One of the conditions is the use of the fibrillar structure bonding on a flat polydimethylsiloxane (PDMS), and the other is a smooth plate bonding on the flat PDMS. We found that the bonding strength of the fibrillar structure is triple of the smooth one. This result proves the plane bonding is vulnerable to the crack and the fibrillar structure has stronger bonding strength than the plane one. This work implicitly explains the adoption of fibrillar structure which connects the lens to the ciliary muscle in human eyes.5222894 bytesapplication/pdfen-US仿生人眼、纖毛結構屈調軟性透鏡拉伸強度氧化鋁薄膜Humanoid lensfibrillar structureaccommodationsoft lenstensile strengthanodic aluminum oxidethesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/256133/1/ntu-99-R97522506-1.pdf