| Summary: | 碩士 === 國立中興大學 === 精密工程學系所 === 94 === This thesis is to describe a simple method for fabricating variable-focus lens including a flexible lens chamber and a driving mechanism. A variable-focus lens with 2mm in diameter and focus turning range from 20.33mm to 9.36mm based on different liquids in the chamber was carried out from this investigation. Main fabrication steps are described below. First, the patterened microstructure was used as a mold using photolithography process and then using PDMS to cast over the mold. The cured PDMS was peeled off from the mold and becomes the microchannel and circular chamber. Second, a piece of PDMS was used as the substrate. And then making the two PDMS structures to bond together using PDMS solution in the oven was proceeded. After that, trim the proper section as the principal part for this variable-focus lens. Finally using a piezoelectric actuator to drive the chamber membrane can control the flow rate precisely. To change the deformation of PDMS film by varying the microfluidic volume can achieve the desired variable focal length. The characteristics of this method are completely using PDMS as final structure. Only bonding once that can effectively reduce leakage caused by unnecessary bonding crack. No oxygen plasma treatment or etching process were used, it can reduce the instrument cost.
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