基于介质上电润湿的钳制式液体变焦透镜

Meniscus Pinned Variable-Focus Liquid Lens Based on Electrowetting-on-Dielectric

提出了一种基于介质上电润湿（EWOD）的新型液体变焦透镜结构并研制出样机。它由一个依次覆盖有氧化铟锡（ITO）透明导电薄膜及疏水介质膜的玻璃下极板、悬浮于其上方的一个中空金属环、以及作为透镜的去离子水滴组成。通过改变施加于ITO电极与金属环之间的电压大小,就能调控水滴的曲率,从而实现对透镜焦距的调节。实验结果表明,在0-40V电压范围内,该透镜样机的焦距调节范围为8.51mm至55.9mm,可实现对2.0cm至无穷远处物体的聚焦。

A novel configuration of variable-focus liquid lens based on electrowetting-on-dielectric phenomenon is presented, which consists of a glass slide growing a conductive indium tin oxide （ITO） film and a hydrophobic dielectric film respectively, a hollow metal ring suspended right above the slide, and a droplet of deionized water for lens. By changing the applied voltage between the metal ring and the ITO control electrode, the curvature of the droplet meniscus can be reversibly adjusted, thus tuning the focal length of the lens. A prototype of the lens was tested. The experimental results show that in the range of 0-40 V power supplies, the focal length can be tuned from 8. 51 mm to 55. 9 mm, and the liquid lens is able to focus on objects from 2 centimeters up to infinity away with good imaging quality.