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잉크젯 인쇄 기술을 이용한 인쇄회로기판용 나노구리배선 개발
서상훈(Shanghoon Seo),이로운(Ro-Woon Lee),윤관수(Kwansoo Yun),정재우(Jaewoo Joung),이희조(Hee-Jo Lee),육종관(Jong-Gwan Yook) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Study that form micro pattern by direct ink jet printing method is getting attention recently. Direct ink jet printing spout fine droplet including nano metal particle by force or air pressure. There is reason which ink jet printing method is profitable especially in a various micro-patterning technology. It can embody patterns directly without complex process such as mask manufacture or screen-printing for existent lithography. In this study, research of a technology that ejects fine droplet form of Pico liter and forms metal micro pattern was carried with inkjet head of piezoelectricity drive system. Droplet established pattern while ejecting consecutively and move on the surface at the fixed speed. Patterns formed in ink are mixed with organic solvent and polymer that act as binder. So added thermal hardening process after evaporate organic solvent at isothermal after printing. I executed high frequency special quality estimation of CPW transmission line to confirm electrical property of manufactured circuit board. We tried a large area printing to confirm application possibility of an ink jet technology.
金永財(Youngjae Kim),劉永錫(Youngseuck Yoo),沈原徹(Wonchul Sim),朴敞聖(Changsung Park),鄭在祐(Jaewoo Joung),吳龍洙(Yongsoo Oh) 대한전기학회 2006 전기학회논문지C Vol.55 No.8
This paper presents the effect of driving waveform for piezoelectric bend mode inkjet printhead with optimized mechanical design. Experimental and theoretical studies on the applied driving waveform versus jetting characteristics were performed. The inkjet head has been designed to maximize the droplet velocity, minimize voltage response of the actuator and optimize the firing frequency to eject ink droplet. The head design was carried out by using mechanical simulation. The printhead has been fabricated with Si(100) and SOI wafers by MEMS process and silicon direct bonding method. To investigate how performance of the piezoelectric ceramic actuator influences on droplet diameter and droplet velocity, the method of stroboscopy was used. Also we observed the movement characteristics of PZT actuator with LDV(Laser Doppler Vibrometer) system, oscilloscope and dynamic signal analyzer. Missing nozzles caused by bubbles in chamber were monitored by their resonance frequency. Using the water based ink of viscosity of 4.8 cps and surface tension of 0.025 N/m, it is possible to eject stable droplets up to 20 ㎑, 4.4 ㎧ and above 8 pl at the different applied driving waveforms.
김영재(Youngjae Kim),유영석(Youngseuck Yoo),심원철(Wonchul Shim),박창성(Changsung Park),정재우(Jaewoo Joung),오용수(Yongsoo Oh) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
This paper presents the effect of driving waveform for piezoelectric bend mode inkjet printhead with optimized mechanical design. Experimental and theoretical studies on the applied driving waveform versus jetting characteristics were performed. The inkier head has been designed to maximize the droplet velocity, minimize voltage response of the actuator and optimize the firing frequency to eject ink droplet. The head design was carried out by using mechanical simulation. The printhead has been fabricated with Si(l00) and SOI wafers by MEMS process and silicon direct bonding method. To investigate how performance of the piezoelectric ceramic actuator influences on droplet diameter and droplet velocity, the method of stroboscopy was used. Also we observed the movement characteristics of PZT actuator with LDV (Laser Doppler Vibrometer) system, oscilloscope and dynamic signal analyzer. Missing nozzles caused by bubbles in chamber were monitored by their resonance frequency. Using the water based ink of viscosity of 4.8 cps and surface tension of 0.025N/m, it is possible to eject stable droplets up to 20㎑, 4.4㎧ and above 8pL at the different applied driving waveforms.
장명준(MyoungJoon Jang),백윤아(YoonAh Baik),정현철(HyunChul Jung),정재우(JaeWoo Joung) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Electronics 분야에서 잉크젯 프린팅 배선 제작에 많이 사용되는 전도성 은 나노 잉크의 소성 특성을 연구하였다. 잉크젯 프린터를 이용하여 미세 배선을 인쇄하고, 열처리에 따른 비저항의 변화 양상을 관찰하였다. SEM을 통해 미세구조를 관찰하여 배선의 전기 저항과 미세 구조와의 상관관계를 고찰하였다. 250℃ 20분 동안 소성을 하였을 때 가장 낮은 비저항을 얻었으며 순수 은의 비저항 대비 약 2.6배였다. 또한 TEM을 통해 배선 내부의 pore를 관찰하였고, 그 분포율를 측정하였다
유영석(Youngseuck Yoo),김영재(Youngjae Kim),심원철(Wonchul Sim),박창성(Changsung Park),정재우(Jaewoo Joung),오용수(Yongsoo Oh) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
It is a paper for design, manufacture and estimation of industry inkjet head. Simulations for Actuator, Ink flow and Ejection are executed for securing design ability. Relations between droplet and properties of ink are explained closely through simulation for nozzle. Actually, two silicon plates are made by dry and wet etching and directly bonded. PZT materials is attached on the bonded ink flow part and cut to 540㎛ interval by dicing saw. Actuator was seen variation within 10% between simulation and actual head. Through the ejection estimation, it is shown that stabilized driving voltages change according to viscosity and surface tension of metal ink. Using the metal ink of viscosity of 4.8 cps and surface tension of 0.025 N/m, it is possible to eject the stable droplets with 5㎧, 20 pl, 5 ㎑.