• Proceedings of the Optical Society of Korea Conference
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• 2003.02a
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• pp.256-257
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• 2003

반도체 와이어 본딩(wire-bonding) 조립공정에 사용되는 검사용 현미경 광학계를 설계하였다. 이러한 와이어는 리드프레임에 대해 $\pm$ 1 mm의 단차를 가진다. 이 때 리드프레임은 6배로 관찰하며, 와이어 부분은 2배로 관찰하고자 한다. 그러나 와이어의 단차로 인해 물체거리가 변하게 되며, 일반 광학계로는 배율도 변하게 된다. 물체거리가 변해도 동일한 배율을 가지는 광학계를 설계하기 위해 유한 물점용 3군 줌 광학계를 목적에 맞게 변형시켰다. (중략)

• Proceedings of the Optical Society of Korea Conference
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• 2002.07a
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• pp.30-31
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• 2002

하나의 구동기를 작동하여 거울을 변형시킬 때, 변형된 거울면의 형태를 영향 함수(influence function)라고 정의하며, 이러한 영향 함수를 이용하여 적응 광학계의 주요한 광학 요소인 변형 거울을 효과적으로 모형화하고 설계할 수 있다. 본 논문에서는 유한요소해석을 이용하여 계산된 변형 거울의 실제 영향 함수를 가우시안 함수(Gaussian function) 형태로 단순화하고, 추가로 구동기들 사이의 영향을 고려한 커플링 계수(coupling coefficient)를 도입하여, 주어진 구동기 배열에 대한 영향 함수를 결정하였다. (중략)

• Journal of Korean Ophthalmic Optics Society
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• v.19 no.4
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• pp.487-492
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• 2014

Purpose: This study relates to the development of the 3X scope, whose objective part is configured with a doublet + a meniscus lens. Methods: By the initial condition of the objective part having a configuration of a doublet + a singlet, we could optimize the optical system of scope in order to minimize the finite ray aberrations of the objective part and the whole optical system of scope, and so we could develope a new type 3X scope. Results: On the condition of the objective part having a configuration of a doublet + a singlet, when the optical system of scope was optimized in order to minimize the finite ray aberrations, we could find that the singlet became the meniscus type lens having the concave shape to the direction of the doublet, and the longer the distance between the doublet and the meniscus lens is, the more the finite ray aberrations are minimized. Conclusions: In this study, we could develope a new type 3X scope of which finite ray aberrations can be reduced to 1/14 than the existing scope by adopting the objective part of the 3X scope having a configuration of three lenses composed of a doublet + a singlet. We could confirm that this reduction of aberrations can be a means to increase the effective aperture than the existing scope and to shorten the length of the optical system.

• Proceedings of the Optical Society of Korea Conference
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• 2006.07a
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• pp.519-520
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• 2006

• Korean Journal of Optics and Photonics
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• v.28 no.6
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• pp.304-313
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• 2017

The finite element analysis for optimizing a mirror system consisting of a large-diameter mirror and flexures requires numerous, repetitive calculations and corrections of the actual model to satisfy the given design conditions. In general, modification of this real model is conducted by reconfiguring nodes of the elements. The reconfiguration is very time-consuming work, to fix the continuity of each of the newly formed component nodes at the interfaces. But the process is a very important factor in determining the analysis time. To save time in modeling and actual computation, and to attain faster convergence, we present a new opto-mechanical analysis using non-shared node connections at each of the interfaces of the optical components. By comparing the results between the new element model and a conventional element model with shared node connections, we found that the opto-mechanical performance was almost the same, but the time to reach the given condition was drastically reduced.

• Journal of Korean Ophthalmic Optics Society
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• v.14 no.4
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• pp.39-44
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• 2009

Purpose: To design a mini optical system photographing the iris, which is used in the iridology. Methods: We designed a mini optical system photographing the iris by using the Sigma 2000 design program. Results: We designed a mini optical system photographing the iris, which is suitable in the CCD using a micro actuator for auto-focusing, of which characteristics have the TCL of 30 mm, a magnification of -0.65, about 8.0 mm distance from the 1st lens to the last lens, the max barrel diameter of 11 mm, and about 1 mm of the effective stop diameter. Also the resolution line width of this system is characterised by 92 lps/mm at the 30% MTF value criterion. Conclusions: By designing an optical system of which characteristics have the TCL of 30 mm, about 8.0 mm distance from the 1st lens to the last lens, the max barrel diameter of 11 mm, and the resolution line width of $5.4{\mu}m$ at the 30% MTF value criterion, we could miniaturize the iris photographing optical system.

• The Bulletin of The Korean Astronomical Society
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• v.38 no.1
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• pp.71.2-71.2
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• 2013

1 m 천체망원경에 대한 초기 광기계 구조해석이 진행되었다. 3개의 반사경으로 구성되는 광학계는 Richey-Cretien 방식으로써 두 개의 Nasmyth 초점을 제공하고, 초점비는 F/8이다. 결정된 반사경 마운트 방법에 의해 반사경면의 표면 RMS(Root Mean Square) 변형량은 모두 20 nm보다 작다. 전체 구조물에 대한 구조해석을 수행하기 위해 솔리드, 쉘, 빔 요소 등으로 구성된 정밀유한요소 모델이 NX 소프트웨어로 설계되었다. 전체 구조물은 첫 번째 고유모드는 68 Hz에서 병진모드가 발생했다. 중력에 대해서는 최대 응력이 18.2 MPa로써 미비하였고, 전체 최대 변위는 50.3 ${\mu}m$ 로써 계산되었다. 이 변위값은 광학설계 소프트웨어에 재입력되어 광학계의 성능이 재분석 될 것이다.

• Korean Journal of Optics and Photonics
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• v.17 no.4
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• pp.359-365
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• 2006

Wave-front error(WFE) is the main parameter that determines the optical performance of the opto-mechanical system. In the development of opto-mechanics, WFE due to the main loading conditions are set to the important specifications. The deformation of the optical surface can be exactly calculated thanks to the evolution of numerical methods such as the finite element method(FEM). To calculate WFE from the deformation results of FEM, another approximation of the optical surface deformation is required. It needs to construct additional grid or element mesh. To construct additional mesh is troublesomeand leads to transformation error. In this work, the moving least-squares approximation is used to reconstruct wave front error It has the advantage of accurate approximation with only nodal data. There is no need to construct additional mesh for approximation. The proposed method is applied to the examples of GOCI scan mirror in various loading conditions. The validity is demonstrated through examples.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.05a
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• pp.51-51
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• 2004

렌즈는 광학제품의 성능에 직접적인 영향을 미치는 주요 부품으로서, 고정도의 형상 및 안정된 내부물성을 요구하는 정밀 부품이다. 광학 렌즈는 특정 광학계 내에서 입사광이 원하는 위치에 초점을 맺을 수 있도록 굴절시켜주는 역할을 하며, 이를 위해 초점거리, 배율, 렌즈의 성능 등을 종합적으로 고려하여 렌즈의 형상을 설계해야 한다. 이러한 설계과정은 기하광학에 기반한 광선추적(Ray tracing) 기법을 통해 이루어지며, 주로 CodeV, OSLO 등의 상용 광학계설계 소프트웨어를 사용하여 수행되고 있다.(중략)

• Korean Journal of Optics and Photonics
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• v.8 no.1
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• pp.1-6
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• 1997

The amplitude impulse S(x) of an interferometric optical imaging system for λ=193 nm(ArF laser) and NA=0.5 is derived for the pupil with superposed three Gauss pupils $A_1$($\omega$), $A_{2-}$($\omega$) and $A_{2+}$($\omega$). It is shown that FWHM of S(x) can be far less than the Rayleigh's criterion of resolution $\frac{1}{2}{\epsilon}_R$, where ${\epsilon}_R$ is equal to λ=193 nm in the present case of NA=0.5. The three Gauss pupils are provided in an optical system which consists of a Twyman-Green interferometer and an imaging system. The system is proposed and relevent optical components are discussed. Siloxane polymer is suggested for fabrications of amplitude modulation plates. In the present work, we assumed the system is free from aberration and linear. The case that the system has residual aberrations is important, and further work is necessary.