Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Focus Adjustment Method with Statistical Analysis for an Interchangeable Zoom Lens with Symmetric Error Factors

대칭성 공차를 갖는 교환렌즈용 줌 렌즈의 핀트 조정법과 통계적 해석

  • 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.)
  • 류재명 (삼성전자(주) 디지털이미징사업부 렌즈개발그룹) ;
  • 조재흥 (한남대학교 이과대학 광.전자물리학과) ;
  • 강건모 (삼성전자(주) 디지털이미징사업부 렌즈개발그룹) ;
  • 이해진 (삼성전자(주) 디지털이미징사업부 렌즈개발그룹) ;
  • 요네야마 슈지 (삼성전자(주) 디지털이미징사업부 렌즈개발그룹)
  • Received : 2011.08.17
  • Accepted : 2011.10.07
  • Published : 2011.10.25
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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.

디지털 일안 반사식 카메라 또는 콤팩트 시스템 카메라용의 교환렌즈용 줌 광학계는 화각과 제품 사양에 따라 여러 가지 형태 가 있으므로, 하나의 AF(auto-focus)군으로만 줌 렌즈의 광각단과 망원단 2곳에서 상면이동의 보정(즉, 핀트 조정)이 불가능한 경우가 발생한다. 또한 줌 광학계의 광각단과 망원단 2곳에서의 후초점거리(back focal length, BFL)가 설정된 BFL 설계값과 일치하도록 조정하기 위해서는 적어도 2곳에서 핀트 조정을 해야 한다. 본 논문에서는 이러한 광학계에 대한 종민감도의 개념을 사용한 핀트 조정의 계산 방법에 대해 제안하고, 이 광학계에 대해 핀트 조정의 조정량 한계를 통계적 분석을 통하여 계산했다.

Keywords

References

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  4. Statistical Analysis of Focus Adjustment Method for a Floating Imaging System with Symmetric Error Factors vol.23, pp.5, 2012, https://doi.org/10.3807/KJOP.2012.23.5.189