Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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Characteristics of a Miniaturized Ultrasonic Motor for Auto-focusing of a Mobile Phone

  • Lim Kee-Joe (Dept. of Electrical Engineering and Computer Science, Chungbuk Nat'l University) ;
  • Lee Jong-Sub (Testing and Research team) ;
  • Kang Seong-Hwa (Dept. of Fire Prevention and Safety, Chungcheong University)
  • Published : 2006.03.01
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Abstract

In this paper, the design and characteristics of a novel ultrasonic motor are investigated. Such a motor is appropriate far use in the optical zoom or auto focusing functions of the lens system in mobile phones. Its design and simulation of performances are carried out by FEM commercial software (ATILA). The shape of the motor is similar to a square without one side, on which an optical lens can be mounted. Two sheets of piezoelectric ceramics are adhered to both sides of two legs of the elastic body, respectively To drive the ultrasonic motor, the voltage is applied to two sheets of piezoelectric ceramics bonded to one leg. The rotation direction can be easily changed by switching the piezoelectric sheets bonded to the other leg, to which voltage is applied. A proto type of the motor is fabricated and its outer size is $10^*10^*2[mm3]$ including the camera lens of which the diameter is 7.5(mm). Its power consumption is about 0.3[W] and the speed of rotation is adjustable from 10 to 200[rpm] according to the applied voltage

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References

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  2. An auto-focus lens actuator using ionic polymer metal composites: Design, fabrication and control vol.13, pp.10, 2012, https://doi.org/10.1007/s12541-012-0247-4
  3. A Novel Ultrasonic Motor Using Orthogonal Bimorphs vol.43, pp.4, 2007, https://doi.org/10.1109/TMAG.2007.891395