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New Electromagnetic Design of Miniature AF VCM Actuator with Low Cost

  • C.-S. Liu (a1), L. Kuo (a2) and B.-J. Tsai (a1)

Abstract

Recently, compact and high-resolution camera modules with auto-focusing (AF) function have been integrated into cell phones in order to capture sharp photographs. Consumer demands AF camera modules in cell phones to have high performance with low cost. Accordingly, the present study proposes a new electromagnetic design of miniature AF voice coil motor (VCM) actuator with closed-loop control for cell phone camera modules to satisfy the requirements. The structure of the proposed AF VCM actuators was designed by using simulation methods. The performance of the proposed AF VCM actuators was demonstrated by a laboratory-built prototype. The experimental results have shown that the proposed AF VCM actuator has excellent performance with lower power consumption, higher positioning repeatability, and lower cost, when compared to previous AF VCM actuators with open-loop control or closed-loop control.

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Corresponding author

*Corresponding author (imecsl@ccu.edu.tw)

References

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1. Kim, K. H., Lee, S. Y. and Kim, S., “A Mobile Auto-Focus Actuator Based on a Rotary VCM with the Zero Holding Current,” Optics Express, 17, pp. 58915896 (2009).
2. Choi, J. S., Yoo, J. and Park, N. C., “Small form Factor Actuator Design for Camera Phone Lens Systems,” Microsystem Technologies, 15, pp. 14891497 (2009).
3. Zhou, T. Y., et al., “A Nut-Type Ultrasonic Motor and Its Application in the Focus System,” Chinese Science Bulletin, 54, pp. 37783783 (2009).
4. Song, B. Y., et al., “Auto-Focusing Actuator and Camera Module Including Flexible Diaphragm for Mobile Phone Camera and Wireless Capsule Endoscope,” Microsystem Technologies, 16, pp. 149159 (2010).
5. Lai, L. K., Tsai, C. L. and Liu, T. S., “Design of Compact Linear Electromagnetic Actuator for Auto-Focusing in Phone Camera,” IEEE Transactions on Magnetics, 47, pp. 47404744 (2011).
6. Liu, C. S. and Lin, P. D., “Miniaturized Auto-Focusing VCM Actuator with Zero Holding Current,” Optics Express, 17, pp. 97549763 (2009).
7. Liu, C. S., Ko, S. S. and Lin, P. D., “Experimental Characterization of High-Performance Miniature Auto-Focusing VCM Actuator,” IEEE Transactions on Magnetics, 47, pp. 738745 (2011).
8. Ko, H. P., Jeong, H. and Koc, B., “Piezoelectric Actuator for Mobile Auto Focus Camera Applications,” Journal of Electroceramics, 23, pp. 530535 (2009).
9. Cao, W. Z., Yang, X. H. and Tian, X. B., “Numerical Evaluation of Size Effect in Piezoelectric Micro-Beam with Linear Micromorphic Electroelastic Theory,” Journal of Mechanics, 30, pp. 467476 (2014).
10. Duocastella, M. and Arnold, C. B., “Transient Response in Ultra-High Speed Liquid Lenses,” Journal of Physics D: Applied Physics, 46, p. 075102 (2013).
11. Zeng, X. and Jiang, H., “Liquid Tunable Microlenses Based on MEMS Techniques,” Journal of Physics D: Applied Physics, 46, p. 323001 (2013).
12. Xu, S., Ren, H. and Wu, S. T., “Dielectrophoretically Tunable Optofluidic Devices,” Journal of Physics D: Applied Physics, 46, p. 483001 (2013).
13. Zhang, H., Ren, H., Xu, S. and Wu, S. T., “Temperature Effects on Dielectric Liquid Lenses,” Optics Express, 22, pp. 19301939 (2014).
14. Lin, H. C. and Lin, Y. H., “An Electrically Tunable-Focusing Liquid Crystal Lens with a Low Voltage and Simple Electrodes,” Optics Express, 20, pp. 20452052 (2012).
15. Lin, Y. H. and Chen, H. S., “Electrically Tunable-Focusing and Polarizer-Free Liquid Crystal Lenses for Ophthalmic Applications,” Optics Express, 21, pp. 94289436 (2013).
16. Chen, M. S., Chen, P. J., Chen, M. and Lin, Y. H., “An Electrically Tunable Imaging System with Separable Focus and Zoom Functions Using Composite Liquid Crystal Lenses,” Optics Express, 22, pp. 1142711435 (2014).
17. Shian, S., Diebold, R. M. and Clarke, D. R., “Tunable Lenses Using Transparent Dielectric Elastomer Actuators,” Optics Express, 21, pp. 86698676 (2013).
18. Diaz-Calleja, R., et al, “Theoretical Modelling and Experimental Results of Electromechanical Actuation of an Elastomer,” Journal of Physics D: Applied Physics, 46, p. 235305 (2013).
19. Manabu, S. and Morimasa, Y., “Lens Drive Device,”r PAJ 2002-365514 (2002).
20. Liu, C. S. and Lin, P. D., “A Miniaturized Low-Power VCM Actuator for Auto-Focusing Applications,” Optics Express, 16, pp. 25332540 (2008).
21. Product Information, New Shicoh Technology Co. Ltd, http://new-shicoh.eom/publics/index/8/ (2015).

Keywords

New Electromagnetic Design of Miniature AF VCM Actuator with Low Cost

  • C.-S. Liu (a1), L. Kuo (a2) and B.-J. Tsai (a1)

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