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F-Theta Lens 금형코어 형상정도 향상에 관한 연구
김상석(S. S. Kim),정상화(S. H. Jeong),김현욱(H. U. Kim),김혜정(H. J. Kim),김정호(J. H. Kim) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
The global consumption of aspheric surfaces will expand rapidly on the Electronics and Optical Components, Information and Communications, Aerospace and Defense, and Medical optics markets etc. We must research on market, technology forecast and analysis of aspheric surfaces that is a principle step of ultra precision machine technology with a base one of optical elements. Especially, F-theta lens is one of the important parts in LSU(Laser scanning unit) because it affects on the optical performance of LSU dominantly. The core is most of important to produce plastic F-theta lens by plastic injection molding method, which is necessary to get the ultra-precision aspheric and non-axisymmetric machine processing technology.
김대지(D. J. Kim),홍성주(S. J. Hong),송창헌(C. H. Song),권상석(S. S Kweon),최병운(B.W. Choi) 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.10
This paper studies modal impact test of main frame of a mobile crusher, which is used for rock crushing and aggregate production. For this purpose, a vibration test was performed in order to investigate vibrational characteristics of the main frame, and geometry of main frame was devised according to the sensor position of the main frame. The modal impact test results were then used as an input to the sum FRF and geometry of main frame, and level of natural frequency of main frame were investigated for analysis of the vibration mode.