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

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...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2009-01, Vol.45 (1), p.155-159
Main Authors: LIU, Chien-Sheng, LIN, Psang-Dain, LIN, Po-Heng, KE, Shun-Sheng, CHANG, Yu-Hsiu, HORNG, Ji-Bin
Format: Article
Language:English
Subjects:
Actuators
Air gaps
Cameras
Cell phones
Cellular phones
Coiling
Coils
Cross-disciplinary physics: materials science
rheology
Energy consumption
Exact sciences and technology
Feedback
Lenses
linear motors
Magnetism
Materials science
Miniature
Motors
Other topics in materials science
Permanent magnets
Physics
Power consumption
Reproducibility
self-focusing
Signal generators
simulation
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Summary: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.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2008.2006564