OSA's Digital Library

Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 4 — Feb. 18, 2008
  • pp: 2533–2540

Optics InfoBase > Optics Express > Volume 16 > Issue 4 > Page 2533

A miniaturized low-power VCM actuator for auto-focusing applications

Chien-Sheng Liu and Psang Dain Lin  »View Author Affiliations


Optics Express, Vol. 16, Issue 4, pp. 2533-2540 (2008)
http://dx.doi.org/10.1364/OE.16.002533


View Full Text Article

Enhanced HTML    Acrobat PDF (296 KB)


Advanced Search

Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

In keeping with consumer preferences for ever smaller electronic products, a requirement exists for compact, high-performance auto-focusing actuators for the camera modules deployed in cell phones. Accordingly, the present study proposes a miniaturized electromagnetic-based actuator comprising a voice coil motor (VCM) and a closed-loop position control system in which an auto-focusing capability is achieved by using a position feedback signal generated by a Hall element to dynamically adjust the position of the lens module. The experimental results show that the holding current required to maintain a lens module weighing 200 mgw in the vertical position is 17 mA ±2 mA. Compared to conventional VCM actuators deployed in cell phone camera applications, the actuator presented in this study has a smaller size (6.5 mm×6.5 mm×4 mm) and an improved power efficiency. In particular, the miniaturized actuator reduces the holding current required to maintain the lens module in the focusing position by around 75% of that required in a traditional actuator.

© 2008 Optical Society of America

OCIS Codes
(040.1490) Detectors : Cameras
(230.2090) Optical devices : Electro-optical devices
(260.5950) Physical optics : Self-focusing

ToC Category:
Imaging Systems

History
Original Manuscript: December 18, 2007
Revised Manuscript: February 3, 2008
Manuscript Accepted: February 6, 2008
Published: February 8, 2008

Virtual Issues
Vol. 3, Iss. 3 Virtual Journal for Biomedical Optics

Citation
Chien-Sheng Liu and Psang Dain Lin, "A miniaturized low-power VCM actuator for auto-focusing applications," Opt. Express 16, 2533-2540 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-4-2533


Sort:  Author  |  Year  |  Journal  |  Reset  

References

  1. H. Ren, D. Fox, P. A. Anderson, B. Wu, and S. T. Wu, "Tunable-focus liquid lens controlled using a servo motor," Opt. Express 14, 8031-8036 (2006). [CrossRef] [PubMed]
  2. H. Ren and S. T. Wu, "Variable-focus liquid lens," Opt. Express 15, 5931-5936 (2007). [CrossRef] [PubMed]
  3. C. C. Cheng, C. A. Chang, and J. A. Yeh, "Variable focus dielectric liquid droplet lens," Opt. Express 14, 4101-4106 (2006). [CrossRef] [PubMed]
  4. K. Campbell, Y. Fainman, and A. Groisman, "Pneumatically actuated adaptive lenses with millisecond response time," Appl. Phys. Lett. 91, 171111 (2007). [CrossRef]
  5. S. W. Lee, and S. S. Lee, "Focal tunable liquid lens integrated with an electromagnetic actuator," Appl. Phys. Lett. 90, 121129 (2007). [CrossRef]
  6. S. M. Sohn, S. H. Yang, S. W. Kim, K. H. Baek and W. H. Paik, "SoC design of an auto-focus driving image signal processor for mobile camera applications," IEEE Trans. on Consumer Electronics 52, 10-16(2006). [CrossRef]
  7. C. W. Chiu, P. C. P. Chao, and D. Y. Wu, "Optimal design of magnetically actuated optical image stabilizer mechanism for cameras in mobile phones via genetic algorithm," IEEE Trans. Magn. 43, 2582-2584 (2007). [CrossRef]
  8. S. Manabu, and Y. Morimasa, "Lens drive device," PAJ2002-365514 (2002).
  9. S. M. Jang, J. Y. Choi, S. H. Lee, H. W. Cho, and W. B. Jang, "Analysis and experimental verification of moving-magnet linear actuator with cylindrical Halbach array," IEEE Trans. Mag. 40, 2068-2070 (2004). [CrossRef]
  10. Y. Hirano and J. Naurse, "Dynamic characteristics of a voice coil motor for a high performance disk drive," IEEE Trans. Mag. 25, 3073-3075 (1989). [CrossRef]
  11. H. C. Yu, T. Y. Lee, S. J. Wang, M. L. Lai, J. J. Ju, D. R. Huang, and S. K. Lin, "Design of a voice coil motor used in the focusing system of a digital video camera," IEEE Trans. Mag.  41, 3979-3981 (2005). [CrossRef]
  12. H. C. Yu, T. Y. Lee, S. K. Lin, L.T. Kuo, S. J. Wang, J. J. Ju, and D. R. Huang, "Low power consumption focusing actuator for a mini video camera," J. Appl. Phys., 99, 08R901 (2006). [CrossRef]
  13. M. J. Chung, "Development of compact auto focus actuator for camera phone by applying new electromagnetic configuration," Proc. SPIE  6048, 60480J (2005). [CrossRef]
  14. http://www.shicoh.com/e/index.ht.
  15. Standard Mobile Imaging Architecture, http://www.smia-forum.org/.

Cited By

 Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.


« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited