Journal of the Korean Society of Manufacturing Technology Engineers (한국생산제조학회지)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
권호 표지
DOI QR코드

DOI QR Code

H∞ Control on the Optical Image Stabilizer Mechanism in Mobile Phone Cameras

이동통신 단말기 카메라의 손떨림 보정 장치의 H∞ 제어

  • Lee, Chibum (Mechanical System and Design Engineering, Seoul National University of Science and Technology)
  • Received : 2014.05.16
  • Accepted : 2014.06.10
  • Published : 2014.06.15
Download PDF
⟨ Previous Next ⟩

Abstract

This study proposes a closed-loop shaping control method with $H_{\infty}$ optimization for optical image stabilization (OIS) in mobile phone cameras. The image stabilizer is composed of a horizontal stage constrained by ball bearings and actuated by the magnetic force from voice coil motors. The displacement of the stage is measured by Hall effect sensors. From the OIS frequency response experiment, the transfer function models of the stage and Hall effect sensor were identified. The weight functions were determined considering the tracking performance, noise attenuation, and stability with considerable margins. The $H_{\infty}$ optimal controller was executed using closed-loop shaping and limiting the controller order, which should be less than 6 for real-time implementation. The control algorithm was verified experimentally and proved to operate as designed.

Keywords

References

  1. Volpe, J., 2012, viewed 6 May 2014, Nokia Lumia 920 official: Dual-core 1.5GHz Snapdragon S4 CPU, 8MP PureView camera, Windows Phone 8,
  2. Galstian, T. V., 2013, Smart Mini-Cameras, CRC Press, USA
  3. Hader, O., Robbins, M., Novogrozky, Y., Kaplan, D., 1996, Image Motion Restoration from a Sequence of Images, Opt. Eng. 35 2898-2904. https://doi.org/10.1117/1.600959
  4. Chereau, R., Breckon, T. P., 2013, Robust Motion Filtering as an Enabler to Video Stabilization for a Tele-operated Mobile Robot, Proc. SPIE Electro-Optical Remote Sensing, Photonic Technologies, and Applications VII, 8897:1 1-17.
  5. Kauhanen, P., Rouvinen, J., 2006, Actuator for Miniature Optical Image Stabilizer, 10th International Conference on New Actuators, 549-552.
  6. Chiu, C. W., Chao P. C-P., Wu, D. Y., 2007, Optimal design of magnetically actuated optical image stabilizer mechanism for cameras in mobile phones via genetic algorithm, IEEE Transactions on Magnetics 43:6 2582-2584. https://doi.org/10.1109/TMAG.2007.893320
  7. Lin, C. Y., Chiou, J. C., 2011, MEMS-based thermally-actuated image stabilizer for cellular phone camera, Journal of Micromechanics and Microengineering 22:11 115029
  8. Song, M. G., Hur, Y. J., Park, N. C., Park, K. S., Park, Y. P., Lim, S. C., Park, J. H., 2009, Design of a Voice-coil Actuator for Optical Image Stabilization Based on Genetic Algorithm, IEEE Transactions on Magnetics 45:10 4558-4561. https://doi.org/10.1109/TMAG.2009.2021399
  9. Son, D. H., Baek, H. W., Song, M. G., Park, N. C., Park, Y. P., Park, K. S., Lim, S. C., Park, J. H., 2009, Design of Ball Bearing Type OIS Actuator for Mobile Camera Module, Transactions of the Korean Society for Noise and Vibration Engineering 20:4 361-372. https://doi.org/10.5050/KSNVE.2010.20.4.361
  10. Song, M. G., Baek, H. W., Park, N. C., Park, K. S., Yoon, T., Park, Y. P., Lim, S. C., 2010, Development of Small Sized Actuator With Compliant Mechanism for Optical Image Stabilization, IEEE Transactions on Magnetics 46:6 2369-2372. https://doi.org/10.1109/TMAG.2010.2042288
  11. Shimohata, T., Tsuchida, Y., Kusaka, H., 2002, Control technology for optical image stabilization, SMPTE Mot. Imag. J. 111:12 609-615. https://doi.org/10.5594/J14146
  12. Yeom, D. H., 2009, A Method to Prevent Transfer Device of Image Stabilizer from Blunting by Artificial Vibration, Journal of Institute of Control, Robotics and Systems 15:11 1076-1079. https://doi.org/10.5302/J.ICROS.2009.15.11.1076
  13. Doyle, J. C., Glover, K., Khargonekar, P., Francis, B., 1989, State-space solutions to standard $H_2$ and $H_{\infty}$ control problems, IEEE Transactions on Automatic Control 34:8 831-847. https://doi.org/10.1109/9.29425
  14. Yeo, D. Y., Han, S. I. Lee, K. S., 2010, Backstepping Control-Based Precise Positioning Control Using Robust Friction State Observer and RFNN, Journal of the Korean Society for Precision Engineering 19:3 394-401.

Cited by

  1. Development of Evaluation System for Optical Image Stabilization Actuator vol.29, pp.6, 2014, https://doi.org/10.7735/ksmte.2020.29.6.503