摘要
題目：擠壓管型壓電噴墨頭設計與微液滴噴射之研究
研究生：郭哲瑋
指導教授：呂宗行 博士
關鍵字：擠壓管式壓電噴墨頭、噴墨頭製作技術、壓電噴墨訊號驅動

為了能深入了解擠壓管式壓電噴墨頭(Squeeze Mode Piezoelectric Inkjet Printhead)特性與設計的問題，自行製作擠壓式壓電噴墨頭，採用單一環狀將壓電管與毛細玻璃管接合。實驗上透過自行發展的驅動觀測系統以控制訊號輸出產生脈衝電壓訊號與延遲訊號，配合都普勒雷射振盪儀(Microscopic Laser Doppler Vibrometer)量測壓電管振幅，來達到分析擠壓管式壓電噴墨頭的尺寸與結構上的設計。研究中對於單一環狀接合的壓電噴墨頭，由各式測試結果證實亦存在著波傳導現象。電壓作為改變操作參數時，當電壓提高，所產生液滴噴發型態依序為，單一液滴噴發、不規則噴發、多液滴噴發。適當調整電壓能得到所需的噴發型態。於最佳擊發時間施加正脈衝電壓訊號，能得到以最低電壓使液滴擊發且所得到液滴擊發速度最大。壓電噴墨頭結構產生最大共振效果同時也是最佳擊發時間點。擠壓管式壓電噴墨頭之壓電材料長度尺寸較長的共振效果較好，此結果對於選擇壓電管尺寸有相當的幫助

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.

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