Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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An Theoretical Investigation on the Minimization of Birefringence Distribution in Optical Disk Substrate

광디스크 기판 성형시 발생하는 복굴절의 최소화를 위한 이론적 연구

  • 김종성 (연세대학교 대학원 기계설계학과) ;
  • 강신일 (연세대학교 기계·전자 공학부)
  • Published : 2000.04.01
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Abstract

It is necessary to improve mechanical and optical properties in the optical disk substrates as the information storage density using short wavelength laser are being developed. The birefringence distribution is regarded as one of the most important optical properties for optical disk. In the present study, the birefringence distrubution is calculated using the Leonov model for viscoelastic constitutive equations and Cross/WLF model for viscosity approximation. The effects of processing conditions upon the development of birefringence discosity approximation. The effects of processing conditions upon the development of birefringence distribution in the optical disk were examined theoretically. It was found that the values of the birefringence distributions were very sensitive to the mold wall temperature history which minimizes the birefringence distribution. The analytical results showed the possibility of improving mechanical and optical properties in the optical disk substrates by active control of the mold wall temperature history.

Keywords

References

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