Study of Voice Coil Motor for Lens Actuator of Digital Camera in Mobile Phone

• Main Author: 蔡志祥
• Other Authors: 呂宗熙
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/49931970210835612228

碩士 === 國立交通大學 === 機械工程系所 === 97 === Recently, it is popular that a digital camera is installed in a mobile phone. In a digital camera, an actuator moves a lens to carry out focusing. Common lens actuators include stepper motor, voice coil motor, and piezo motor. Compared to actuators of the other two types, voice coil motors have advantages of lowest price, good repeatability and the least amount of usage of power transistors. For the design of voice coil motors in a digital camera, the researcher faces with the challenge because of limited space in a mobile phone. A bad design of voice coil motor causes the lens to shake when the lens is positioned. Shake of lens makes image vague. This study investigates design and positioning control of voice coil motors. Concerning design, this study designs a voice coil motor, uses finite element method to analyze its magnetic field, and fabricates the design. This design has advantages of good shield of magnetic field and low power consumption. In addition, concerning positioning control, this study uses fuzzy control to suppress shake of the lens, and spends less time to complete positioning control of the lens.