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Journal of Electroceramics

, Volume 22, Issue 1–3, pp 346–351 | Cite as

Multilayer piezoelectric linear ultrasonic motor for camera module

  • Dong-Soo Paik
  • Kyoung-Ho Yoo
  • Chong-Yun Kang
  • Bong-Hee Cho
  • Sahn Nam
  • Seok-Jin Yoon
Article

Abstract

Piezoelectric linear ultrasonic motors have been widely studied for auto focusing devices of digital cameras and cellular phones due to their simple structure. A piezoelectric motor operated at low voltages, not achievable using bulk piezoelectrics, is required for the camera module of cellular phone. In this study, a tiny piezoelectric linear motor was fabricated and its dynamic properties at low voltages were analyzed. To reduce the driving voltage, thin multilayer ceramics fabricated by a tape casting method were applied to the motor. The proper number of layers of the piezoelectric element was determined by ATILA simulation program. As a result of the simulation, the largest displacement of the shaft was observed at 21 layers. Characteristics of the motor were analyzed with respect to applied voltages and frictional forces between the mobile element and shaft. Velocity and force of the motor increased with increasing applied voltage. The motor exhibited a velocity of 10.9 mm/s and a thrust force of 110 mN at a frictional force of 62.5 mN and an applied voltage of 10 Vp-p.

Keywords

Piezoelectric ceramics Frictional force Multilayer actuator Linear motor 

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Dong-Soo Paik
    • 1
    • 3
  • Kyoung-Ho Yoo
    • 1
  • Chong-Yun Kang
    • 1
  • Bong-Hee Cho
    • 2
  • Sahn Nam
    • 3
  • Seok-Jin Yoon
    • 1
  1. 1.Thin Film Materials Research CenterKISTSeoulSouth Korea
  2. 2.Department of Electrical EngineeringThe University of SuwonHwasungSouth Korea
  3. 3.Department of Materials Science EngineeringKorea UniversitySeoulSouth Korea

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