Koyama Daisuke, Isago Ryoichi, Nakamura Kentaro
Precision and Intelligence Laboratory, Tokyo Institute of Technology, 4259-R2-26 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.
Opt Express. 2010 Nov 22;18(24):25158-69. doi: 10.1364/OE.18.025158.
A compact, high-speed variable-focus liquid lens using acoustic radiation force is proposed. The lens consists of an annular piezoelectric ultrasound transducer and an aluminum cell (height: 3 mm; diameter: 6 mm) filled with degassed water and silicone oil. The profile of the oil-water interface can be rapidly varied by applying acoustic radiation force from the transducer, allowing the liquid lens to be operated as a variable-focus lens. A theoretical model based on a spring-mass-dashpot model is proposed for the vibration of the lens. The sound pressure distribution in the lens was calculated by finite element analysis and it suggests that an acoustic standing wave is generated in the lens. The fastest response time of 6.7 ms was obtained with silicone oil with a kinematic viscosity of 100 cSt.
提出了一种利用声辐射力的紧凑型高速可变焦距液体透镜。该透镜由环形压电超声换能器和一个装有脱气水和硅油的铝制单元（高度：3毫米；直径：6毫米）组成。通过施加来自换能器的声辐射力，可以快速改变油水界面的轮廓，从而使液体透镜作为可变焦距透镜工作。针对透镜的振动提出了一种基于弹簧-质量-阻尼器模型的理论模型。通过有限元分析计算了透镜中的声压分布，结果表明透镜中产生了声驻波。使用运动粘度为100厘沲的硅油获得了6.7毫秒的最快响应时间。
