Characteristics of a Miniaturized Ultrasonic Motor for Auto-focusing of a Mobile Phone

Title & Authors
Characteristics of a Miniaturized Ultrasonic Motor for Auto-focusing of a Mobile Phone
Lim Kee-Joe; Lee Jong-Sub; Kang Seong-Hwa;

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 $\small{10^*10^*2[mm3]}$ 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
Keywords
Auto focusing;Bending Vibration;FEM;Piezoelectric;Ultrasonic Motor;
Language
English
Cited by
1.
Fabrication and characteristics of impact type ultrasonic motor, Journal of the European Ceramic Society, 2007, 27, 13-15, 4159
2.
An auto-focus lens actuator using ionic polymer metal composites: Design, fabrication and control, International Journal of Precision Engineering and Manufacturing, 2012, 13, 10, 1883
3.
A Novel Ultrasonic Motor Using Orthogonal Bimorphs, IEEE Transactions on Magnetics, 2007, 43, 4, 1413
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