Journal of the Optical Society of Korea

  • 제18권2호
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  • Pages.134-145
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  • 2014
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  • 1226-4776(pISSN)
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  • 2093-6885(eISSN)
한국광학회 (Optical Society of Korea)
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Unified Analytic Calculation Method for Zoom Loci of Zoom Lens Systems with a Finite Object Distance

  • Ryu, Jae Myung (Department of Optical Engineering, Kumoh National Institute of Technology) ;
  • Oh, Jeong Hyo (Department of Photonics and Sensors, Hannam University) ;
  • Jo, Jae Heung (Department of Photonics and Sensors, Hannam University)
  • 투고 : 2014.02.24
  • 심사 : 2014.03.21
  • 발행 : 2014.04.25
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초록

The number of lens groups in modern zoom camera systems is increased above that of conventional systems in order to improve the speed of the auto focus with the high quality image. As a result, it is difficult to calculate zoom loci using the conventional analytic method, and even the recent one-step advanced numerical calculation method is not optimal because of the time-consuming problem generated by the iteration method. In this paper, in order to solve this problem, we suggest a new unified analytic method for zoom lens loci with finite object distance including infinite object distance. This method is induced by systematically analyzing various distances between the object and other groups including the first lens group, for various situations corresponding to zooming equations of the finite lens systems after using a spline interpolation for each lens group. And we confirm the justification of the new method by using various zoom lens examples. By using this method, we can easily and quickly obtain the zoom lens loci not only without any calculation process of iteration but also without any limit on the group number and the object distance in every zoom lens system.

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참고문헌

  1. J. H. Jung, "Paraxial design and locus analysis of zoom lens system," Dissertation of Ph. D. Degree, Kyungnam University (1994).
  2. J. M. Ryu, Y. S. Kim, J. H. Jo, G. M. Kang, H. J. Lee, and H. K. Lee, "Statistical analysis of focus adjustment method for a floating imaging systemwith symmetric error factors," Korean J. Opt. Photon. (Hankook Kwanghak Hoeji) 23, 189-196 (2012). https://doi.org/10.3807/KJOP.2012.23.5.189
  3. J. M. Ryu, J. H. Cho, J. H. Jung, Y. S. Chun, and G. M. Kang, "The design of multi-configurative microscopic system with a fixed magnification and the independency on the object distance," in Optical Science and Technology, Proc. SPIE 5523, 352-362 (2004).
  4. K. Yamaji, "Design of zoom lenses," in Progress in Optics VI, E. Wolf, ed. (North-Holland, Amsterdam, 1971), Chapter 4.
  5. N. J. Yoo, W. S. Kim, J. H. Jo, J. M. Ryu, H. J. Lee, and G. M. Kang, "Numerical calculation method for paraxial zoom loci of complicated zoom lenses with infinite object distance by using Gaussian bracket method," Korean J. Opt. Photon. (Hankook Kwanghak Hoeji) 18, 410-420 (2007). https://doi.org/10.3807/HKH.2007.18.6.410
  6. D. K. Lee, N. J. Yoo, J. H. Jo, J. M. Ryu, G. M. Kang, and H. J. Lee, "General numerical calculation method for paraxial zoom loci of zoom lenses with finite object distance by using Gaussian bracket method," Korean J. Opt. Photon. (Hankook Kwanghak Hoeji) 20, 156-165 (2009). https://doi.org/10.3807/HKH.2009.20.3.156
  7. J. H. Oh, J. M. Ryu, and J. H. Jo, "Analytic calculation method of zoom loci for zoom lens system with infinite object distance," Korean J. Opt. Photon. (Hankook Kwanghak Hoeji) 24, 125-134 (2013). https://doi.org/10.3807/KJOP.2013.24.3.125
  8. W. H. Press, S. A. Teukolsky, W. T. Vetterling, and B. P. Flannery, Numerical Recipes in C, 2nd ed. (Cambridge University Press, New York, USA, 1992), Chapter 3.
  9. Y. Kamimura and A. Hoshina, "Macro lens," Japan Patent JP2008-020656 (Japanese ed.) (2008).
  10. J. M. Ryu, "Lens system," US Patent US2010-0177407A1 (2010).
  11. J. M. Ryu, J. H. Jo, G. M. Kang, H. J. Lee, and S. Yoneyama, "Focus adjustment method with statistical analysis for an interchangeable zoom lens with symmetric error factors," Korean J. Opt. Photon. (Hankook Kwanghak Hoeji) 22, 230-238 (2011). https://doi.org/10.3807/KJOP.2011.22.5.230
  12. J. M. Ryu, "Macro lens system and pickup device including the same," US Patent US2011-0096410A1 (2011).

피인용 문헌

  1. First-order method of zoom lens design by means of generalized parameters vol.33, pp.8, 2016, https://doi.org/10.1364/JOSAA.33.001537
  2. Tolerance Analysis and Compensation Method Using Zernike Polynomial Coefficients of Omni-directional and Fisheye Varifocal Lens vol.18, pp.6, 2014, https://doi.org/10.3807/JOSK.2014.18.6.720
  3. Three Degrees of Freedom Global Calibration Method for Measurement Systems with Binocular Vision vol.20, pp.1, 2016, https://doi.org/10.3807/JOSK.2016.20.1.107