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Design and Characterization of Miniature Auto-Focusing Voice Coil Motor Actuator for Cell Phone Camera Applications

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6 Author(s)
Chien-Sheng Liu ; Dept. of Mech. Eng., Nat. Cheng Kung Univ., Tainan ; Psang-Dain Lin ; Po-Heng Lin ; Shun-Sheng Ke
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When designing an auto-focusing actuator for use in cell phone cameras, it is essential to minimize the device size, maximize the positioning repeatability, and minimize the power consumption. In a previous study, we presented a miniature auto-focusing voice coil motor (VCM) actuator for cell phone camera applications in which the lens was precisely positioned by a closed-loop feedback signal generated by a Hall element. Our study characterizes the performance of this device by using an experimental approach. The results show that the proposed actuator is not only smaller than a conventional VCM actuator with an open-loop positioning system, but also has improved positioning repeatability, a more rapid response, and lower power consumption.

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Magnetics, IEEE Transactions on  (Volume:45 ,  Issue: 1 )