Effects of trapped air bubbles on frequency responses of the piezo-driven inkjet printheads and visualization of the bubbles using synchrotron X-ray |
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Authors: | Byung-Hun Kim Tae-Gyun Kim Tae-Kyung Lee Sungwook Kim Seung-Joo Shin Seong-Jin Kim Sang-Joon Lee |
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Affiliation: | aProcess Development Group, Samsung Electronics LCD, Youngin-Si 446-711, Republic of Korea;bDepartment of Mechanical Engineering, Pohang University of Science and Technology, San 31, Hyoja Dong, Pohang 790-784, Republic of Korea |
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Abstract: | The reliability of drop formation is one of the key factors for the successful commercialization of inkjet printing applications. However, when the air bubble is entrapped from the nozzle exit, it leads to stop jetting of the droplets immediately. It has been known that the trapped air bubbles inside the chamber prevent a printhead from stable jetting. In this study the synchrotron X-ray has been used to visualize the air bubbles in the flow field inside of the printhead undergoing the standard jetting with the firing frequency of 1–20 kHz. An air pocket of bubble was formed repeatedly and reproduced well through the tested printheads at a certain jetting condition. To see the effects of the bubbles on the dynamic characteristics of the piezoelectric printheads, the piezoelectric velocity on the top of the pressure chamber was measured with a laser vibrometer. When the bubble was trapped at the nozzle exit orifice, the piezo velocity signals showed significantly different frequency peaks appearing in the spectrum and the high frequency components were identified with the frequency response measurements. |
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Keywords: | Inkjet Air bubble Piezoelectric printhead X-ray |
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