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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 ㎑.
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.
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.