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	Integrated lens auto-focus system driven by a nut-type ultrosonic motor (USM)
	Zhou TieYing ; Chen Yu ; Lu CunYue ; Fu DeYong ; Hu XiaoPing ; Li Yi ; Tian Bin
	2010-10-12 ; 2010-10-12
关键词	ultrasonic motors (USM) module driver IC auto-focus (AF) Engineering, Multidisciplinary Materials Science, Multidisciplinary
中文摘要	This paper introduces an integrated optical auto-focus system driven by a nut-type ultrasonic motor (USM). The system comprises an optical lens as a rotor (M6 or M7), a polyhedral tube of copper as a stator; an image sensor, and a driver IC of the motor. The sizes of the AF (auto-focus) module are 8.5 mmx8.5 mmx5.9 mm. The piezoelectric elements are bonded on the external surface of the stator. The rotor has external screw thread that engages with the inner screw thread of the stator. When the piezoelectric elements are excited by the driver IC, a bend traveling wave in plane is generated on the stator along the circle direction, that drives the lens rotor to rotate and then to move axially. The driver IC is controlled by an image feedback of an image sensor centered on the axis of the casing, then the optical focusing is realized. The power consumption is zero at rest and is less than 0.25 W in motion; focusing precision < 10 mu m; speed > 3 r/s(180 r/min); response < 10 ms; high reliability: resistant to shock and fall off; directly driven by the driver IC without transmission mechanism; the friction force is namely the driving force and noiseless. The integrated optical auto-focus system is very useful, especially for cellular phones. The image resolution of 3-5 MP has been obtained in the module prototypes of the cellular phone.
语种	英语 ; 英语
出版者	SCIENCE PRESS ; BEIJING ; 16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/81470]
专题	清华大学
推荐引用方式 GB/T 7714	Zhou TieYing,Chen Yu,Lu CunYue,et al. Integrated lens auto-focus system driven by a nut-type ultrosonic motor (USM)[J],2010, 2010.
APA	Zhou TieYing.,Chen Yu.,Lu CunYue.,Fu DeYong.,Hu XiaoPing.,...&Tian Bin.(2010).Integrated lens auto-focus system driven by a nut-type ultrosonic motor (USM)..
MLA	Zhou TieYing,et al."Integrated lens auto-focus system driven by a nut-type ultrosonic motor (USM)".(2010).

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