Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Evaluation of Optical Performance for an Aspheric Lens Connecting with FE Analysis of Injection Molding

사출성형 유한요소해석과 연계한 비구면렌즈의 광학적 특성평가

  • 박근 (서울산업대학교 기계설계 자동화공학부) ;
  • 엄혜주 (서울산업대학교 기계설계 자동화공학부 대학원) ;
  • 김종필 (서울산업대학교 기계설계 자동화공학부 대학원) ;
  • 주원종 (서울산업대학교 기계설계 자동화공학부)
  • Published : 2007.02.01
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Abstract

The present study covers an integrated simulation method to evaluate optical performance of an aspheric plastic lens by connecting a finite element (FE) analysis of injection molding with a ray tracing simulation. Traditional ray tracing methods have based on the assumption that the optical properties of a lens are homogeneous throughout the entire volume. This assumption is to a certain extent unrealistic for injection-molded plastic lenses because material properties vary at every point due to the injection molding effects. To take into account the effects of the inhomogeneous optical properties of the molded lens, a new.ay tracing scheme is proposed in conjunction with a FE analysis of the injection molding. A numerical scheme is developed to calculate ray paths on every element layer with more realistic information of the refractive indices which can be obtained through the FE analysis. This information is then used to calculate the ray paths based on the FE mesh of which nodal points have unique index values. The proposed tracing scheme is implemented on the tracing of an aspheric lens, and its validity is ascertained through experimental verification.

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References

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