• Transactions of the Society of Information Storage Systems
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• v.2 no.1
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• pp.13-20
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• 2006

In this paper, we propose novel optics design for media inside near-field recording(NFR) using hemispherical solid immersion lens(HMS). To obtain strong advantage of data protection and high data capacity simultaneously, HMS based near field optics using aplanatic position of super hemisphere is designed. In this design, to improve small optical tolerance of this aplanatic position, additional aspheric lens surface is added on top of the HMS and it is combined with zoom optics which composed of two single lenses having low numerical aperture(NA). Also, to compensate chromatic aberration which happens seriously in optics using blue laser diode, diffractive optical element is used. Using zoom optics, additional aspheric lens surface, and diffractive optical element together, wavefront aberration and chromatic aberration are effectively reduced in broad range of cover layer thickness and wavelength variation. In addition, in this paper, effect of gap induced aberration is investigated by analyzing different behavior of each TM and TE wave for designed media inside dual-layer NFR optics.

• Korean Journal of Optics and Photonics
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• v.17 no.5
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• pp.420-429
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• 2006

In the zoom lens of digital still cameras with the variation of the image plane generated by various symmetric error factors such as curvature, thickness and refractive index error of each lens surface about the optic axis, we induce a theoretical condition to fix constantly the image plane by translating the compensator group of the zoom lens by using the Gaussian bracket. We confirm the validity of this condition by using three examples of general zoom lens types with 3, 4, and 5 groups, respectively. When these error factors are randomly changed within the range of tolerance according to the Monte Carlo method, we verify that the distributions of the degree of moving of the compensator are normal distributions at three zoom lens types. From capability analysis using these results, we theoretically propose the method estimating the standard deviation, that is, sigma-level, as a function of the maximum movement of the compensator.

• Korean Journal of Optics and Photonics
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• v.16 no.4
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• pp.354-360
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• 2005

A high performance LWIR(long wavelength infra red) zoom thermal imaging sensor using $480{\times}6$ HgCdTe(MCT) linear detector has been developed by ADD Korea. The optical system consists of zoom telescope having large objective about 190 mm diameter and optically well corrected scanning system. The zoom ratio of the telescope is 3: 1 and its magnification change is performed by moving two lens groups. And also these moving groups are used for athermalization of the system. It is certain that the zoom sensor can be used in wide operating temperature range without any degradation of the system performance. Especially, the sensor image can be displayed with the HDTV(high definition television) format of which aspect ratio is 16:9. In case of HDTV format, the scanning system is able to display 620,000 pixels. This function can make wider horizontal field of view without any loss of performance than the normal TV format image. The MRTD(minimum resolvable temperature difference) of the LWIR thermal imaging sensor shows good results below 0.04 K at spatial frequency 2 cycles/mrad and 0.23 K at spatial frequency 8 cycles/mrad at the narrow field of view.

• Journal of the Optical Society of Korea
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• v.14 no.2
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• pp.109-120
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• 2010

We have developed mathematically precise image-processing algorithms for extracting rectilinear images from fisheye images as well as digital pan/tilt/zoom technology. Using this technology, vertical lines always appear as vertical lines in the panned and/or tilted images. Furthermore, polygonal panoramic images composed of multiple rectilinear images have been obtained using the developed digital pan/tilt technology.

• Proceedings of the Optical Society of Korea Conference
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• 2004.07a
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• pp.220-221
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• 2004

• Proceedings of the Optical Society of Korea Conference
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• 2007.02a
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• pp.62-63
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• 2007

• The Optical Journal
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• s.163
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• pp.20-25
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• 2016

광학, 레이저, 통신분야 일본 최대 종합 전시회인 동경포토닉스 전시회가 지난 4월 6일부터 8일까지 도쿄 빅사이트에서 성황리에 개최되었다. Reed Exhibition Japan의 주최로 열린 이번 전시회에서는 제 16회 Phont ix 2016 이외에도 제 26회 파인테크(FineTech) 재팬, 제 7회 필름테크 재팬, 제 5회 플라스틱 재팬, 제 3회 메탈재팬, 제1회 세라믹 재팬, 일본 고기능 신소재전시회(Highly Functional Material World 2016)로 구성된 일본 최대 종합 전시회다.

• 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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• 2004.02a
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• pp.18-19
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• 2004

• The Optical Journal
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• s.171
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• pp.16-17
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• 2017

쾰른 국제 사진 영상 전시회 photokina(포토키나)가 큰 변화를 시도한다. 2년 주기로 개최되던 photokina는 2018년부터 매년 개최될 예정이며, 2019년부터는 개최 시기가 9월에서 5월로 변경된다. 개최 주기, 개최 시기, 개최 기간, 전시 테마 등 전방위적 변화를 예고하고 있는 photokina는 이미징 세계의 무한한 미래를 리딩할 전시회로 또 한 번 자리매김할 준비를 시작한다. photokina 크리스토프 멘케 이사는 전시회의 대폭적인 변화를 앞두고 진행한 인터뷰에서 앞으로 시도할 변화에 대한 큰 기대감을 보였다. 크리스토프 멘케 이사와의 인터뷰를 통해 photokina의 변화 이유와 사진 영상 기술 개발 트렌드를 알아보고 이미징 세계의 미래를 예측해보자.