Onaka Jessica, Iwase Takahiro, Emoto Akira, Koyama Daisuke, Matsukawa Mami
Appl Opt. 2021 Nov 20;60(33):10365-10371. doi: 10.1364/AO.443945.
New technologies for adaptive optics are becoming increasingly important for miniature devices such as cell-phone cameras. In particular, motion-free autofocusing and optical image stabilization require sophisticated approaches for alternative lens architectures, materials, and processing to replace multiple solid elements. We discuss a new method, to the best of our knowledge, that provides image stabilization via an annular piezoelectric ceramic that uses ultrasound to drive a liquid crystal layer sandwiched between two circular glass substrates. The piezoelectric ceramic is divided into four quadrants that are independently driven with sinusoidal voltages at the resonant frequency of the lens. The technique is based on ultrasound vibrations with a suitable driving scheme. The lens configuration was modeled via finite-element analysis. Various combinations of the four-channel ultrasound transducer can be used to define the focal point of the liquid crystal lens. Clear optical images could be obtained with the lens. By using two-dimensional fast Fourier transforms, the focal point position was defined and shifted in the radial direction.
自适应光学新技术对于手机摄像头等微型设备变得越来越重要。特别是，无运动自动对焦和光学图像稳定需要复杂的方法来用于替代镜头架构、材料和加工，以取代多个固体元件。据我们所知，我们讨论了一种新方法，该方法通过环形压电陶瓷提供图像稳定，该环形压电陶瓷利用超声波驱动夹在两个圆形玻璃基板之间的液晶层。压电陶瓷被分为四个象限，在镜头的共振频率下用正弦电压独立驱动。该技术基于具有合适驱动方案的超声振动。通过有限元分析对镜头配置进行建模。四通道超声换能器的各种组合可用于定义液晶透镜的焦点。使用该透镜可以获得清晰的光学图像。通过使用二维快速傅里叶变换，在径向方向上定义并移动了焦点位置。
