Studies of the Design and Droplet Ejection in a Squeeze Mode Piezoelectric Inkjet Printhead

• Main Authors: Che-WeiKuo, 郭哲瑋
• Other Authors: Leu Tzong-Shyng
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/61860435459480907142

碩士 === 國立成功大學 === 航空太空工程學系碩博士班 === 98 === This study intended to understand the characteristics and designing issues of squeeze mode piezoelectric inkjet printhead. Squeeze mode piezoelectric inkjet printheads have been fabricated by using the piezoelectric PZT tube and glass capillary with contraction nozzle at one end. To study the inkjet printhead performance, a stroboscopic imaging systems was developed to image the droplet ejection process under various driving signals. Microscopic Laser Doppler Vibrometer (MLDV) measurement was used to measure the amplitude of piezoelectric inkjet printhead with different driving voltages and dwelling times. The experimental results confirmed the existence of the pressure wave propagation phenomena inside the squeeze mode piezoelectric inkjet printhead. A optimal pulse signal waveform was found. When the voltage of the optimal pulse signal waveform, the droplet ejection process would change from single droplet ejection to irregular and multiple droplet ejection. The optimal waveform of driving signal is related to the resonance the fluid-structure system. As PZT tube with longer length size and larger diameter, the driving force is stronger. This result will help in selecting the dimensions of piezoelectric tube.