Browse > Article
http://dx.doi.org/10.3807/KJOP.2011.22.5.230

Focus Adjustment Method with Statistical Analysis for an Interchangeable Zoom Lens with Symmetric Error Factors  

Ryu, J.M. (R&D Team, Digital Imaging Business, Samsung Electornics Co., LTD.)
Jo, J.H. (Department of Applied Optics and Electromagnetics, Hannam University)
Kang, G.M. (R&D Team, Digital Imaging Business, Samsung Electornics Co., LTD.)
Lee, H.J. (R&D Team, Digital Imaging Business, Samsung Electornics Co., LTD.)
Yoneyama, Suji (R&D Team, Digital Imaging Business, Samsung Electornics Co., LTD.)
Publication Information
Korean Journal of Optics and Photonics / v.22, no.5, 2011 , pp. 230-238 More about this Journal
Abstract
There are many types of interchangeable zoom lens in the digital single lens reflex camera and the compact digital still camera system in order to meet various specifications such as the field angle. Thus special cases for which the focus adjustment using only an auto-focus group is not available in the focal point correction (that is, the focus adjustment) of both wide and tele-zoom positions are sometimes generated. In order to make each BFL(back focal length, BFL) coincide at wide and tele-zoom positions with each designed BFL, focus adjustment processes must be performed at least in these two points within the zoom lens system. In this paper, we propose a method of focus adjustment by using the concept of focus sensitivity, and we calculate a limit on focus adjustment distance by means of statistical analysis.
Keywords
Lens design; Tolerance analysis; Zoom lens system; Focus adjustment;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 A. M. Joglekar, Statistical Methods for Six Sigma (John Wiley & sons, Inc., New Jersey, USA, 2003), Chapter 5.
2 Camera Lens Hyaka, Encyclopedia, 1st ed. (Shashin Kogyo Shoppan Co. LTD, 2001, Japanese ed.), Chapter 76.
3 Dpreview.com, http://www.dpreview.com/news/1001/10010402samsungnx.asp.
4 Amateur Photographer, "AP award winners 2011," (IPC Media Ltd., 2011), http://www.amateurphotographer.co.uk/news/AP_Awards_2011_news_305140.html.
5 J. M. Ryu, G. M. Kang, H. J. Lee, H. K. Lee, and J. H. Jo, "Correction method for the variation of the image plane generated by various symmetric error factors of zoom lenses of digital still cameras and estimation method of defect rate due to the correction," Hankook Kwanghak Hoeji 15, 420-429 (2006).   과학기술학회마을   DOI
6 T. Suzuki and K. Usui, "Development of the 18-200 mm high zoom ratio lens system," Optics Design Group of Opt. Soc. Japan (Japanese ed.) No. 35 (2006).
7 S. Hayakawa, "Design of image stabilizing optical system," Proc. SPIE 3482, 240-251 (1998).   DOI
8 K. Yamaji, "Design of zoom lenses," in Progress in Optics VI, E. Wolf, ed. (North-Holland, Amsterdam, The Netherlands, 1971), Chapter 4.
9 G. Suzuki, A. Shibayama, and T. Ito, "Zoom lens with vibration insulation," Japan Patent 2006-284763 (2006).
10 "Code V," is a registered trademark of ORA, http://www.opticalres.com/.
11 W. Mendenhall, R. J. Beaver, and B. M. Beaver, Introduction to Probability and Statistics, 12th ed. (Tomson Co., Toronto, Canada, 2006), Chapter 11.