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광 커넥터용 세라믹 Ferrule 가공기술 개발에 관한 연구
이응숙,이성국,황경현,정명영,Lee, Eung-Suk,Lee, Seong-Guk,Hwang, Gyeong-Hyeon,Jeong, Myeong-Yeong 한국정밀공학회 1992 한국정밀공학회지 Vol. No.
This paper presents the process of manufacturing technology of ceramics ferrule for opitcal fiber connector. Precision zirconia ceramic ferrules is widely for high performance and low cost single mode optical fiber connectors. To polish the hole of the zirconia ceramic ferrule, the wire lapping instrument is developed and the machining experiment is conducted. Through the centerless grinding using diamond wheel the surface roughness of zirconia ceramics ferrule is below the 1$\mu$m Rmax.
Fabrication of UV imprint stamp using diamond-like carbon coating technology
EUNG-SUG LEE(이응숙),JUN-HO JEONG(정준호),KI-DON KIM(김기돈),YOUNG-SUK SIM(심영석),DAE-GEUN CHOI(최대근),JUNHYUK CHOI(최준혁),TAE-WOO LIM(임태우),SANG-HU PARK(박상후),DONG-YOL YANG(양동열),NAM-GOO CHA(차남구),IN-KWON KIM(김인권),JIN- 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The two-dimensional (2D) and three-dimensional (3D) diamond-like carbon (DLC) stamps for ultraviolet nanoimprint lithography (UV-NIL) were fabricated using two kinds of methods, which were a DLC coating process followed by the focused ion beam (FIB) lithography and the two-photon polymerization (TPP) patterning followed by nano-scale thick DLC coating. We fabricated 70 ㎚ deep lines with a width of 100 ㎚ and 70 ㎚ deep lines with a width of 150 ㎚ on 100 ㎚ thick DLC layers coated on quartz substrates using the FIB lithography. 200 ㎚ wide lines, 3D rings with a diameter of 1.35 ㎛ and a height of 1.97 ㎛, and a 3D cone with a bottom diameter of 2.88 ㎛ and a height of 1.97 ㎛ were successfully fabricated using the TPP patterning and DLC coating process. The wafers were successfully printed on an UV-NIL using the DLC stamp. We could see the excellent correlation between the dimensions of features of stamp and the corresponding imprinted features.
전해인프로세스드레싱법에 의한 초정밀 원통 연삭기술 연구
제태진,이응숙,Je, Tae-Jin,Lee, Eung-Suk 한국기계연구원 1998 硏究論文集 Vol.28 No.-
The ELID(electrolytic in-process dressing) grinding method is a new precision grinding technique with the special electrolytic in-process dressing by metal bonded grinding wheel, fluid, and power supply. It is possible to make a efficient precision machining of hard and brittle materials such as ceramics, hard metals, and quenched steels by using this method, In this study, a new efficient precision grinding method with ELID was attempted for application to the machining and finishing processes of cylindrical structural components. And, we try to develop the cylindrical grinding technique for mirror surface of ceramics, tungsten carbide and SCM steel, and for the high efficiency grinding of machined parts, for example, ball screw shaft. Electrical characteristics of three different wheel grit sizes of #325, #2000 and #4000 were investigated experimentally. ELID grinding method is proved to be useful for mirror surface generation and efficient machining.
제태진,황경현,이응숙,김재구,Je, Tae-Jin,Hwang, Gyeong-Hyeon,Lee, Eung-Suk,Kim, Jae-Gu 한국기계연구원 1995 硏究論文集 Vol.25 No.-
Fresnel lenses are developed for flat optics with the optical characteristics close to aspherical lens such as sharp focusing and dispersion instead of spherical or aspherical surface. Usually, these fresnel lenses and diffraction gratings are machined by high-energy beam such as electron beam machining, but recently with the development of ultra precision machine tool and machining technology, 3-dimension micro machining becomes preferable. This study on the micro machining of fresnel lens is carried out to develop the basic technology of ultra precision micro machining. The machined lens mold will be used for the manufacturing of fresnel lens with 120mm focal distance using synthetic resin material with 1.49 refractive index(PMMA), and the shape of lens is 48mm diameter, $300\mum$ pitch and about $5-700\mum$depth of groove in brass.