Browse > Article

The Study on the System of Improving the Assembly Tolerance of Cellphone Camera Module  

Ye, In-Soo (경기공업대학 기계설계과)
Cheong, Seon-Hwan (금오공과대학 기계공학부)
Choi, Seong-Dae (금오공과대학 기계공학부)
Hyun, Dong-Hoon (한국산업기술대학교 나노광공학과)
Publication Information
Journal of the Korean Society of Manufacturing Process Engineers / v.9, no.5, 2010 , pp. 57-63 More about this Journal
Abstract
Tolerance analysis is one of the most important processes to improve the image quality of products. High resolution camera module for mobile phones needs precision assembly technology since the module becomes smaller and thinner. This paper will focus on the unit tolerance and the assembly tolerance which can affect the performance of the module. Lens shading and relative illumination were used to evaluate the optical axis scatter for each component on camera and estimate the assembly yield rate based on the evaluation result. A program was developed to analyze the impact on optical axis by each module, then to optimize the dimensions and tolerance for reducing the scatter of optical axis assembly. Through the simulation, though a rate of relative illumination was declined in where optical axis is displaced $100{\mu}m$ from sensor center, MTF performance is not influenced by increasing in optical axis displacement. It was seen that assembly yield was improved in result of simulation after correcting optical axis tolerance.
Keywords
Assembly tolerance; Camera module; Relative illumination; Optical axis;
Citations & Related Records
연도 인용수 순위
  • Reference
1 K. G. Merkley, K. W. Chase, E. Perry, An Introduction to Tolerance Analysis of Flexible Assemblies," MSC World Users' Conference, MSC Software Corp., Newport Beach, CA, USA, 1996.
2 Zhihua Zou and Edward Morse "Statistical Tolerance Analysis Using GapSpace," 7th CIRP Seminar, ENS de Cachan, pp. 313–322, France, 2001.
3 Bryan F. Bihlmaier, "Tolerance Analysis of Flexible Assemblies Using Finite Element and Spectral Analysis," MS thesis, Brigham Young University, 1999.
4 J. P. McGuire, Jr., " Designing Easily Manufactured Lenses Using a Global Method," in International Optical Design, Technical Digest (CD), Optical Society of America, 2006.
5 Choi, J. S., Lee, K. S., Im, D. H., Song, J. Y., Lee, C. W., Gwak, Y. G., Kim, S. H., "A Research on the Assembly of the Camera Modules for Mobile Phones," Proceedings of the Korean Society of Precision Engineering Conference, pp. 989-992, 2005.
6 Jang, H. S., "Development of Simulation Model to Assembly Tolerance Design", Journal of the Korea Safety Management and Science, Vol. 3, No 3, pp. 221-230, 2001.
7 Market Breakdown of Camera Phone "2nd Half 2007 & 1st Half 2008 Forecast", TSR, Tokyo, 2008