Design and characterization of a thin linear ultrasonic motor for miniature focus systems
Design and characterization of a thin linear ultrasonic motor for miniature focus systems
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DOI：
10.1016/j.sna.2021.112797
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发表时间：
2021-05-07
影响因子：
4.6
通讯作者：
Toyohashi, Tomoaki Mashimo
中科院分区：
文献类型：
--
作者：
Izuhara, Shunsuke;Toyohashi, Tomoaki Mashimo
我们提出了一种微型线性压电超声波电机与薄和中空的设计，它可以作为一个重要组成部分的自动对焦功能，在下一代相机模块。它由一个带孔的方形定子和一个带狭缝的弹性圆柱形滑块组成。插入定子孔中的滑块向外扩展的马达设计实现了用于使透镜居中的中空结构和用于增强马达推力的最佳预载。在这项研究中，我们建立模型的尺寸和预紧力之间的关系，静态量化的预紧力值，并澄清电机的设计方法。在经验上优化预紧力后，我们通过实验评估了基本特性。边长为4.5 mm、厚度小于1 mm的定子提供了12.9 mN的推力，可实现快速响应，这是自动对焦的要求。最后，利用具有视觉回馈控制的马达驱动系统来示范一个实际的透镜组在影像感测器前的定位，以获得更清晰的影像。(c)2021爱思唯尔有限公司版权所有。
We present a miniature linear piezoelectric ultrasonic motor with a thin and hollow design, which can serve as an essential component of autofocusing features in next-generation camera modules. It consists of a thin square stator with a hole and an elastic cylindrical slider with a slit. The motor design, in which the slider inserted into the stator hole expands outward, enables a hollow structure for centering a lens and an optimal preload for enhancing the motor thrust force. In this study, we model the relationship between the dimensions and the preload statically to quantify the preload value and clarify the design methodology of the motor. After optimizing the preload empirically, we evaluate the fundamental char-acteristics experimentally. The stator with a side length of 4.5 mm and a thickness of less than 1 mm provides a thrust force of 12.9 mN that leads to a quick response, which is a requirement of autofocusing. Finally, the motor drive system with visual feedback control is used to demonstrate the positioning of an actual lens group in front of an image sensor to obtain clearer images.(c) 2021 Elsevier B.V. All rights reserved.