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

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References

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  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]
  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]
  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).

2008 (1)

2007 (1)

2006 (1)

K. Tatsuno, "Current trends in digital cameras and camera-phones," Quarterly review 18, 35-44 (2006).

2004 (1)

S. Kuiper and B. H. W. Hendriks, "Variable-focus liquid lens for miniature cameras," Appl. Phys. Lett. 85, 1128-1130 (2004).
[CrossRef]

Chung, M.-J.

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).

Hendriks, B. H. W.

S. Kuiper and B. H. W. Hendriks, "Variable-focus liquid lens for miniature cameras," Appl. Phys. Lett. 85, 1128-1130 (2004).
[CrossRef]

Jeong, H.

H.-P. Ko, H. Jeong, and B. Koc, "Piezoelectric actuator for mobile auto focus camera applications," J. Electroceram. 20, (to be published).

Ko, H.-P.

H.-P. Ko, H. Jeong, and B. Koc, "Piezoelectric actuator for mobile auto focus camera applications," J. Electroceram. 20, (to be published).

Koc, B.

H.-P. Ko, H. Jeong, and B. Koc, "Piezoelectric actuator for mobile auto focus camera applications," J. Electroceram. 20, (to be published).

Kuiper, S.

S. Kuiper and B. H. W. Hendriks, "Variable-focus liquid lens for miniature cameras," Appl. Phys. Lett. 85, 1128-1130 (2004).
[CrossRef]

Lin, P. D.

Liu, C.-S.

Ren, H.

Son, S.-Y.

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).

Tatsuno, K.

K. Tatsuno, "Current trends in digital cameras and camera-phones," Quarterly review 18, 35-44 (2006).

Wu, S. T.

Appl. Phys. Lett. (1)

S. Kuiper and B. H. W. Hendriks, "Variable-focus liquid lens for miniature cameras," Appl. Phys. Lett. 85, 1128-1130 (2004).
[CrossRef]

Opt. Express (2)

Quarterly review (1)

K. Tatsuno, "Current trends in digital cameras and camera-phones," Quarterly review 18, 35-44 (2006).

Other (3)

H.-P. Ko, H. Jeong, and B. Koc, "Piezoelectric actuator for mobile auto focus camera applications," J. Electroceram. 20, (to be published).

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).

F. Jorgensen, The Complete Handbook of Magnetic Recording, (MacGraw-Hill, 1995).

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