高解析熱氣泡式噴墨頭墨滴成形觀測

Visualization and Measurement of Droplet Ejection from High-Resolution Thermal-Bubble Inkjet Printhead

張正明(Cheng-Ming Chang)

指導教授 ： 吳俊諆

國立中央大學/工學院/機械工程研究所碩士在職專班/碩士(2008年)

摘要

本論文針對高解析度之熱氣泡式噴墨頭的噴墨行為做觀測，透過自製簡易的墨滴觀測系統，利用閃頻同步的原理，配合光學鏡頭組、訊號產生器及影像擷取裝置，將不同時間點之噴墨影像記錄，並以影像軟體分析墨滴串的長度、飛行速度及墨滴尺寸。文中探討不同的操作電壓、頻寬、頻率及不同黏度的墨水對墨滴軌跡的效應，並與噴墨行為的關聯做出解釋，也與文獻結果做比對。最後藉由量測實際印表機給予噴墨頭的訊號，得知電壓與頻寬訊號在提供維持穩定噴墨的熱通量，可藉由調整不同的頻率大小，來符合不同的列印紙張與列印效果。此外，在執行噴墨頭開發初期，可藉由本墨滴觀測系統，先找出符合該噴墨頭的穩定噴墨訊號，以防止因操作不當使加熱器被燒毀。再藉由調整頻率的大小，墨水的特性，來達到符合要求的列印品質，可縮短開發時程及降低成本。

關鍵字

墨滴成形 ； 熱氣泡式噴墨頭

並列摘要

This study visualizes and measures the droplet ejection process of a high-resolution thermal-bubble inkjet printhead. A simple system utilizes the synchronization of the stroboscope, which consist of a set of optical lens, a function generator, and an image grabber, to record the droplets image at different delay time and analyze the length, flying speed and size of droplets. Also, the influences of voltage, pulse width, frequency, and the different viscosity of ink on droplet ejection process are discussed in order to know the relation between the inkjet signals and droplet ejection behavior, and then compare it with related records of documents. Finally, the signals of the inkjet printhead from a genuine printer are measured to investigate the relation of signal and the printing quality. This study finds that the voltage and pulse width are two key factors for providing stable heat flux, and by adjusting frequency one can adapt for various types of paper and printing effect. Further, during the lead time of developing inkjet printhead, this experimental system can be used to measure the correct signals and hence prevent heater burnout by misoperation. Moreover, this system can be utilized to adjust the frequency and change the ink characteristic in order to meet with the requirement of printing quality and to reduce the lead time and development costs.

並列關鍵字

droplet ejection ； printhead ； inkjet ； thermal bubble

參考文獻

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