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초소형 광 픽업용 하이브리드 렌즈의 능동 정렬 및 성능평가
강성묵 ( Sung Mook Kang ),이진의 ( Jin Eui Lee ),조은형 ( Eun Hyoung Cho ),손진승 ( Jin Seung Sohn ),박노철 ( No Cheol Park ),박영필 ( Youn Gpil Park ) 정보저장시스템학회 2005 추계학술대회논문집 Vol.2005 No.-
The next generation of optical storage systems requires higher numerical aperture (NA) objective lenses and shorter wavelength laser in order to improve the unit areal density. A blu-ray technology satisfies a miniaturization and a high capacity which are the requirements of the portable device. In this paper, we analyze the optical performance of hybrid micro lens and do active alignment. The hybrid micro lens is manufactured by using a wafer based fabrication technology. Optical components of hybrid micro lens are evaluated. The measurement of the optical power, the spot size and the wavefront error are performed to evaluate the hybrid micro lens with NA 0.85. Using the measured data, we estimate if the performance of hybrid micro lens corresponds to the designed performance. After the performance of hybrid micro lens is evaluated, the integrated optical pickup and the hybrid micro lens are assembled by active alignment using UV curing and the optical performance of SFFOP is satisfied with BD specification.
조은형,정진태 漢陽大學校 工學技術硏究所 2000 工學技術論文集 Vol.9 No.1
본 논문에서는 Hamilton의 원리를 이용하여 전개하는 보에 대한 지배방정식과 경계조건을유도한다. 유도된 지배방정식은 순간고유형상의 시간의존 기저함수를 이용한 Galerkin 방법으로 이산화한다. 본 논문에서는 이산화된 방정식을 가지고 보가 전개할 때와 후퇴할 때의 시간응답해석을 수행하며 이를 통해 시간에 따라 길이가 변하는 보의 종진동에 대한 전형적인 양상을 제시한다. In this paper, the governing equation and the boundary conditions of deploying beam are derived using Hamiltons principle. The Galerkin method with time-dependent basis functions of the instantaneous natural modes is adopted to discretize the governing equation. Based on the discretized equations, the time integration analysis is performed and numerical results for the deploying and retrieving velocity are analyzed to illustrate the qualitative features of longitudinal vibrations.