Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Statistical Analysis of Focus Adjustment Method for a Floating Imaging System with Symmetric Error Factors

대칭형 공차를 갖는 플로팅 광학계의 상면 변화 보정 방법에 대한 통계적 해석

  • Ryu, Jae Myung (R&D Team, Digital Imaging Business, Samsung Electronics Co., Ltd.) ;
  • Kim, Yong Su (R&D Team, Digital Imaging Business, Samsung Electronics Co., Ltd.) ;
  • Jo, Jae Heung (Department of Applied Optics and Electromagnetics, Hannam University) ;
  • Kang, Geon Mo (R&D Team, Digital Imaging Business, Samsung Electronics Co., Ltd.) ;
  • Lee, Hae Jin (R&D Team, Digital Imaging Business, Samsung Electronics Co., Ltd.) ;
  • Lee, Hyuck Ki (R&D Team, Digital Imaging Business, Samsung Electronics Co., Ltd.)
  • 류재명 (삼성전자(주) 디지털이미징사업부 렌즈개발그룹) ;
  • 김용수 (삼성전자(주) 디지털이미징사업부 렌즈개발그룹) ;
  • 조재흥 (한남대학교 이과대학 광.전자물리학과) ;
  • 강건모 (삼성전자(주) 디지털이미징사업부 렌즈개발그룹) ;
  • 이해진 (삼성전자(주) 디지털이미징사업부 렌즈개발그룹) ;
  • 이혁기 (삼성전자(주) 디지털이미징사업부 렌즈개발그룹)
  • Received : 2012.08.06
  • Accepted : 2012.09.24
  • Published : 2012.10.25
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Abstract

A floating optical system is a system that moves more than 2 groups to focus at the camera lens. At the camera optics, the floating system that is mainly used is an optical system such as a macro lens which changes magnification very much. When the floating system is assembled and fabricated in the factory, there are differences between the image plane of the sensor and the focal plane of the infinity or macro state. Therefore, in a considerable proportion of cases, the focus adjustment to minimize the difference of BWD(Back Working Distance) is carried out in the process of manufacturing. In this paper, in order to decide the movement of each group in a floating system, we evaluated the rotation angle of CAM for the focus adjustment. We know that the maximum magnification of macro state is corrected by this numerical method for the focus adjustment, too. We investigated the limit of CAM rotation angle of the system by using statistical analysis for CAM rotation angle, which uses the focus adjustment of the floating system with symmetric error factors.

플로팅 광학계는 초점 맞춤 시, 2개 이상의 군이 움직이는 광학계를 의미한다. 카메라 광학계에서는 매크로 렌즈와 같이 배율 변화가 큰 광학계에 주로 채용된다. 플로팅 광학계도 가공 및 조립 오차로 인해 무한대단 및 매크로단의 초점위치가 촬상소자의 결상면과 일치하지 않는다. 그러므로 제조공정상에서 이러한 BWD(Back Working Distance) 차이를 최소화하는 초점 조정을 해야 한다. 본 논문에서는 플로팅 광학계의 각 군들의 이동량을 결정하기 위하여 초점 조정에 필요한 캠 회전각을 계산하고, 초점조정에 따른 플로팅 광학계의 최대 배율도 보정하는 수치해석 방법을 제안하였다. 그리고 이를 이용하여 대칭형 공차를 갖는 플로팅 광학계의 제조 오차를 고려한 초점 조정에 필요한 캠 회전각의 분포를 통계학적으로 계산하여 캠 회전각의 허용 범위를 결정하는 방법도 제안하였다.

Keywords

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