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Optics Express

Optics Express

  • Vol. 17, Iss. 7 — Mar. 30, 2009
  • pp: 5891–5896

A mobile auto-focus actuator based on a rotary VCM with the zero holding current

Kyung-Ho Kim, Seung-Yop Lee, and Sookyung Kim  »View Author Affiliations


Optics Express, Vol. 17, Issue 7, pp. 5891-5896 (2009)
http://dx.doi.org/10.1364/OE.17.005891


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Abstract

In this work, an auto-focus actuator moving lens in mobile phone cameras is developed by applying a rotary VCM (voice coil motor). A novel inclined cam structure is used to convert the rotational motion by the VCM by into the linear motion of the focusing lens. The new focusing design enables the zero holding current required to maintain the lens module in the focusing position as well as the reduction of the module thickness. This paper presents the theoretical analysis and optimal design for the VCM actuator, cam structure and preload spring. We manufacture a prototype module with the size of 9.9×9.9×5.9 mm3. The experimental results agree with the theoretical predictions and meet the required specifications for mobile camera applications.

© 2009 Optical Society of America

OCIS Codes
(040.1490) Detectors : Cameras
(230.2090) Optical devices : Electro-optical devices

ToC Category:
Imaging Systems

History
Original Manuscript: December 19, 2008
Revised Manuscript: March 11, 2009
Manuscript Accepted: March 20, 2009
Published: March 27, 2009

Citation
Kyung-Ho Kim, Seung-Yop Lee, and Sookyung Kim, "A mobile auto-focus actuator based on a rotary VCM with the zero holding current," Opt. Express 17, 5891-5896 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-7-5891


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References

  1. K. Tatsuno, "Current trends in digital cameras and camera-phones," Quarterly review 18, 35-44 (2006).
  2. C.-S. Liu and P. D. Lin, "A miniaturized low-power VCM actuator for auto-focusing applications," Opt. Express 16, 2533-2540 (2008). [CrossRef] [PubMed]
  3. H.-P. Ko, H. Jeong, and B. Koc, "Piezoelectric actuator for mobile auto focus camera applications," J. Electroceram. 20, (to be published).
  4. M.-J. Chung and S.-Y. Son, "Development of compact auto focus actuator for camera phone by applying new electromagnetic configuration," J. Mech. Sci. Technol. (KSME Int. J.) 20, 2087-2093 (2006).
  5. H. Ren and S. T. Wu, "Variable-focus liquid lens," Opt. Express 15, 5931-5936 (2007). [CrossRef] [PubMed]
  6. S. Kuiper and B. H. W. Hendriks, "Variable-focus liquid lens for miniature cameras," Appl. Phys. Lett. 85, 1128-1130 (2004). [CrossRef]
  7. F. Jorgensen, The Complete Handbook of Magnetic Recording, (MacGraw-Hill, 1995).

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