Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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The Effects of Driving Waveform of Piezoelectric Industrial Inkjet Head for Fime Patterns

산업용 압전 잉크젯 헤드의 구동신호에 따른 특성

  • Kim, Young-Jae (eMD Lab., Central R&D Institute, Samsung Electro-Mechanics) ;
  • Yoo, Young-Seuck (eMD Lab., Central R&D Institute, Samsung Electro-Mechanics) ;
  • Sim, Won-Chul (eMD Lab., Central R&D Institute, Samsung Electro-Mechanics) ;
  • Park, Chang-Sung (eMD Lab., Central R&D Institute, Samsung Electro-Mechanics) ;
  • Joung, Jae-Woo (eMD Lab., Central R&D Institute, Samsung Electro-Mechanics) ;
  • Oh, Yong-Soo (eMD Lab., Central R&D Institute, Samsung Electro-Mechanics)
  • 김영재 (삼성전기 중앙연구소 eMD Lab.) ;
  • 유영석 (삼성전기 중앙연구소 eMD Lab.) ;
  • 심원철 (삼성전기 중앙연구소 eMD Lab.) ;
  • 박창성 (삼성전기 중앙연구소 eMD Lab.) ;
  • 정재우 (삼성전기 중앙연구소 eMD Lab.) ;
  • 오용수 (삼성전기 중앙연구소 eMD Lab.)
  • Published : 2006.07.12
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Abstract

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 characteristic s 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 0.025N/m, it is possible to eject stable droplets up to 20kHz, 4.4m/s and above 8pL at the different applied driving waveforms.

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