Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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A Study on the Rotation-Induced Birefringence in Plastic Disk Substrate

회전에 의해 플라스틱 기판에 추가로 발생하는 복굴절의 측정에 관한 연구

  • 김종선 (단국대학교 대학원 기계공학과) ;
  • 윤경환 (단국대학교 기계공학과)
  • Published : 2003.12.01
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Abstract

Extensive studies have been conducted for reducing the residual stresses and birefringence in injection-molded optical disk substrate Flow-induced and thermally-induced stresses and birefringence have been found as two main sources during injection molding process. However, high speed rotation also induces extra stresses and birefringence in real operation of disk drives. In the present paper rotation-induced in-plane birefringence has been measured and presented for CD and DVD substrates at different radial position. About 10 - 15 nm of extra retardation in one pass has been measured up to 4,800 rpm. The distribution of extra rotation-induced birefringence will be valuable data for designing an optimal optical disk substrate. Finally, experimental results were compared with the extra stresses calculated from simple formulation.

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References

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