Focus-switchable piezoelectric actuator: A bionic thin-plate design inspired by conch structure

IF 4.1 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical Pub Date : 2024-09-26 DOI:10.1016/j.sna.2024.115921

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引用次数: 0

Abstract

Traditional camera zoom mechanisms, relying on stepper motors and intricate transmission components, suffer from bulky designs that restrict their applicability in compact systems. This study presents a novel piezoelectric focus-switchable mechanism (PFSM) directly driven by a biomimetic radial-mode piezoelectric actuator (RMPA) with inclined driving structure mimicking the conch shell. The PFSM utilizes rotational motion for optical zoom, providing a more compact and efficient alternative to conventional linear motion-based systems. By utilizing finite element method (FEM) optimization, we developed a compact prototype (34 × 34 × 3 mm³, 14.83 g) and experimentally verified its performance, achieving a peak rotational speed of 1573.14 RPM, torque output of 3.6 mN·m, and step displacement resolution of 45.8 μrad. These attributes enable smooth lens module switching for optical zoom, thus demonstrating the mechanism’s feasibility. Importantly, the PFSM offers precise positioning without relying on additional transmission parts and features a self-locking capability when de-energized, rendering it an ideal choice for camera zoom applications. In summary, this study underscores the PFSM’s potential as a compact, lightweight, and efficient camera zoom mechanism, contributing meaningfully to the field of imaging technology and optical systems.

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聚焦可切换压电致动器：受海螺结构启发的仿生薄板设计

传统的相机变焦机构依赖于步进电机和复杂的传动部件，其笨重的设计限制了其在紧凑型系统中的应用。本研究提出了一种新型压电聚焦可切换机构（PFSM），由仿生径向模式压电致动器（RMPA）直接驱动，具有模仿海螺壳的倾斜驱动结构。PFSM 利用旋转运动实现光学变焦，与传统的基于线性运动的系统相比，提供了一种更紧凑、更高效的替代方案。通过利用有限元法（FEM）进行优化，我们开发出了一个紧凑型原型（34 × 34 × 3 mm³，14.83 g），并通过实验验证了其性能，实现了 1573.14 RPM 的峰值转速、3.6 mN-m 的扭矩输出和 45.8 μrad 的阶跃位移分辨率。这些特性实现了光学变焦镜头模块的平滑切换，从而证明了该机构的可行性。重要的是，PFSM 无需依赖额外的传动部件即可实现精确定位，并且在断电时具有自锁功能，是相机变焦应用的理想选择。总之，这项研究强调了 PFSM 作为一种紧凑、轻便、高效的相机变焦机构的潜力，为成像技术和光学系统领域做出了有意义的贡献。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Sensors and Actuators A-physical 工程技术-工程：电子与电气

CiteScore

8.10

自引率

6.50%

发文量

630

审稿时长

49 days

期刊介绍： Sensors and Actuators A: Physical brings together multidisciplinary interests in one journal entirely devoted to disseminating information on all aspects of research and development of solid-state devices for transducing physical signals. Sensors and Actuators A: Physical regularly publishes original papers, letters to the Editors and from time to time invited review articles within the following device areas: • Fundamentals and Physics, such as: classification of effects, physical effects, measurement theory, modelling of sensors, measurement standards, measurement errors, units and constants, time and frequency measurement. Modeling papers should bring new modeling techniques to the field and be supported by experimental results. • Materials and their Processing, such as: piezoelectric materials, polymers, metal oxides, III-V and II-VI semiconductors, thick and thin films, optical glass fibres, amorphous, polycrystalline and monocrystalline silicon. • Optoelectronic sensors, such as: photovoltaic diodes, photoconductors, photodiodes, phototransistors, positron-sensitive photodetectors, optoisolators, photodiode arrays, charge-coupled devices, light-emitting diodes, injection lasers and liquid-crystal displays. • Mechanical sensors, such as: metallic, thin-film and semiconductor strain gauges, diffused silicon pressure sensors, silicon accelerometers, solid-state displacement transducers, piezo junction devices, piezoelectric field-effect transducers (PiFETs), tunnel-diode strain sensors, surface acoustic wave devices, silicon micromechanical switches, solid-state flow meters and electronic flow controllers. Etc...