Investigation of liquid lens driving adopted dual-voltage control

• Main Authors: Chi-Feng Chen, 陳旗峰
• Other Authors: 薛英家
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/44102467579497955329

碩士 === 國立中興大學 === 精密工程學系所 === 98 === This thesis describes a micro-manufacturing method to fabricate liquid lens by using dual-voltage driving, which could be applied to portable digital imaging system. In experiments, a lens with 3 mm diameter and 2 mm thickness is fabricated and investigated with applied voltages on the side and bottom of the lens chamber to observe the adjustable object image behavior. Main process steps are the photolithography process to fabricate micro-structure, assembly both metal rings and acrylic as storage chamber and ITO glass as cover by using by glue. After the lens is sealed, it is biased at different voltages to test lens performance, which study the change of lens curvature due to electrowetting effect, water/Teflon surface with different applied voltages vary the surface tension, which causes different curvatures of the liquid-liquid interface, thus delivers variable focal lengths of lens. The focus of this study is that dual voltages are applied at the bottom and side electrodes of lens, compared to previous liquid lens with a single-electrode bias, not only the bottom electrode but also from the side electrode. A lens is biased on both bottom and side electrodes, with not only more curvature adjustable range but also better accuracy control of curvature.