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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 12 — Jun. 8, 2009
  • pp: 9754–9763

Miniaturized auto-focusing VCM actuator with zero holding current

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

Optics Express, Vol. 17, Issue 12, pp. 9754-9763 (2009)

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In keeping with consumers’ preferences for electronic products of ever smaller size and enhanced functionality, it is necessary to reduce the profile of the auto-focusing actuators used in camera phones without sacrificing their performance. Accordingly, this study modifies the Voice Coil Motor (VCM) actuator proposed by the current group in a previous study (C. S. Liu and P. D. Lin, Opt. Express, 16, 2533–2540, 2008) to accomplish a miniaturized auto-focusing actuator for cell phone camera modules with minimal power consumption. The proposed device comprises a VCM, a closed-loop position control system, a magnetoconductive plate, and a lens support structure to drive the lens to the optimal focusing position. The experimental results show that the actuator has a zero holding current when maintaining the lens in the specified focusing position. Overall, it is shown that compared to existing VCM actuators, the proposed actuator has both a higher power efficiency and an improved positioning repeatability.

© 2009 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:
Optical Devices

Original Manuscript: February 2, 2009
Revised Manuscript: April 30, 2009
Manuscript Accepted: May 22, 2009
Published: May 27, 2009

Chien-Sheng Liu and Psang Dain Lin, "Miniaturized auto-focusing VCM actuator with zero holding current," Opt. Express 17, 9754-9763 (2009)

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