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<p>To tackle the challenge of achieving high optical zoom ratios in motor-driven micro-cameras, this paper presents a dual-piezoelectric stack chip-type micro hollow inertial ultrasonic motor. The motor, consisting of a dual-piezoelectric stack chip, flexible hinges, hollow suspension mechanism, and elastic slider, operates on the inertial stick-slip principle. It is designed for autofocus functions in next-gen camera modules. By adjusting the slider diameter, the optimal preload of the rotor structure was achieved, increasing the motor speed by 7.24 %. Experimental results show the motor operates at a frequency of 26920 Hz, with a speed of 13.8 mm/s and a maximum output force of 15.2 mN. The motor reaches a stable operating state within 0.05 s, suitable for autofocus applications.</p>

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Design of a double piezoelectric stack-based miniature hollow inertia ultrasonic motor for micro-camera autofocus

  • 期刊论文

  • 发表日期：

    2025年11月8日

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  • Huawei Ji,
  • Zhehao Chen,
  • Changqi Yu,
  • Yao Huang

摘要

To tackle the challenge of achieving high optical zoom ratios in motor-driven micro-cameras, this paper presents a dual-piezoelectric stack chip-type micro hollow inertial ultrasonic motor. The motor, consisting of a dual-piezoelectric stack chip, flexible hinges, hollow suspension mechanism, and elastic slider, operates on the inertial stick-slip principle. It is designed for autofocus functions in next-gen camera modules. By adjusting the slider diameter, the optimal preload of the rotor structure was achieved, increasing the motor speed by 7.24 %. Experimental results show the motor operates at a frequency of 26920 Hz, with a speed of 13.8 mm/s and a maximum output force of 15.2 mN. The motor reaches a stable operating state within 0.05 s, suitable for autofocus applications.