A Study on Pressing Conditions in the molding of Aspheric Glass Lenses for Phone Camera Module using Design of Experiments

DOE를 적용한 카메라폰 모듈용 비구면 Glass 렌즈의 가압성형조건 연구

  • 김혜정 (한국광기술원 초정밀공학팀) ;
  • 차두환 (전남대학교 신소재공학부) ;
  • 이준기 (전남대학교 신소재공학부) ;
  • 김상석 (한국광기술원 초정밀공학팀) ;
  • 김정호 (한국광기술원 초정밀공학팀)
  • Published : 2007.08.01


This study investigated the pressing conditions in the molding of aspheric glass lenses for the mega pixel phone camera module using the DOE method. Tungsten carbide (WC; Japan, Everloy Co., 002K),which contained 0.5 w% cobalt (Co), was used to build the mold. The mold surface was ultra-precision ground and polished, and its form accuracy (PV) was 0.85um in aspheric surface. We selected four factors, pressing temperature, force and time of first step, and force of second step, respectively, as the parameters of the pressing process. in order to reduce the number of experiments, we applied fractional factorial design considering the main effects and two-way interactions. The analysis results indicate that the only two main effects, the pressing temperature and the time of pressing step 1, are available for the form accuracy (PV) of the molded lens. The analysis results indicated that the best combination of the factors for lowering the form accuracy(PV) value of molded lens was to have them at their low levels.


  1. A. Y. Yi and A. Jain, 'Compression molding of aspherical glass lenses-A combined experimental and numerical analysis', J. Am. Ceram. Soc., Vol. 88, No. 3, p. 579, 2005
  2. 김현욱, 정상화, 박용필, 김상석, 김혜정, 김정호, '비구면 Glass 렌즈 성형용 초경합금(WC) 코어의 DLC 코팅 효과', 전기전자재료학회논문지, 19권, 11호, p. 1050, 2006
  3. S. D. Jacobs, 'International Progress on Advanced Optics and Sensors', Universal Academy Press, Tokyo, p. 3, 2003
  4. R. G. Bingham, D. D. Walker, D. H. Kim, D. Brooks, R. Freeman, and D. Riley, 'A novel automated process for aspherical surfaces', Proceedings of SPIE 45th Annual Meeting, the International Symposium on Optical Science and Technology, Vol. 4093, p. 4445, 2000
  5. R. S. Chen, H. H. Lee, and C. Y. Yu, 'Application of Taguchi's method on the optimal process design of an injection molded PC/PBT automobile bumper', Compos. Struct., Vol. 39, p. 209, 1997
  6. Y. S. Zu and S. T. Lin, 'Optimizing the mechanical properties of injection molded W-4.9 % Ni-2.l % Fe in Debinding', J. Mater. Process. Technol., Vol. 71, p. 337, 1997
  7. K. Park and J. H. Ahn, 'Design of experiment considering two-way interactions and its application to injection molding processes with numerical analysis', J. Mater. Process. Technol., Vol, 146, p. 221, 2004
  8. Sumita Co.: in Optical Glass Data Book, See, optical/data303.pdf, Code 610579

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