Experimental Studies of Meniscus Dynamic Behaviors in a Squeeze-Mode Piezoelectric Inkjet Printhead

Tzong Shyng Leu; Jan Hua Lin

doi:10.4028/www.scientific.net/MSF.594.155

Paper Titles

The Design and Evaluation of a Supply Chain Logistic Hub for Automobile and Parts Distribution
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Fabrication Micro-Nozzle Plates for Inkjet Print Head Using LIGA Process
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Effects of Substrate Geometry on Performance of Twin-Fluid Atomizer in Metal Powder Production
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Synthesis of Core/Shell Type of Hybrid Magnetic Particle by Using Polyionic Copolymer with Extra Magnetic Field
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Experimental Studies of Meniscus Dynamic Behaviors in a Squeeze-Mode Piezoelectric Inkjet Printhead
p.155

Underfill Injection Molding in Flip-Chip Packaging with Different Bumps Array Arrangements
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Finite Element Prediction of Stack-Die Packages under Board Level Drop Test
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Reliability of SnAgCu Alloys for CMOS Image Sensor QFN Package under Thermal Cycling Loading
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Chemical-Mechanical Polishing of Wafers with Copper Film by Nano-Scale Abrasives
p.181

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Experimental Studies of Meniscus Dynamic Behaviors in a Squeeze-Mode Piezoelectric Inkjet Printhead

Abstract:

Meniscus dynamic behaviors, as well as its optimal waveform of driving signal, in a squeeze mode piezoelectric inkjet device are studied in this paper. To use the squeeze mode piezoelectric inkjet device as a drop-on-demand dispenser, the driving signal is trapezium waveform. The parameters in a trapezium waveform of the driving signal include rise time (trise), dwelling time (tdwell), fall time (tfall) and voltage (Vp). Among these parameters, the most important parameter of driving signal is the dwelling time. To demonstrate the importance of dwelling time, a LED signal synchronized with the driving signal is used to visualize the instantaneous meniscus shape under a microscope. Experimental results show the meniscus oscillation at beginning and droplet ejection at the later phase. It is found there is an optimal dwelling time. At the optimal dwelling time, droplet ejects in a minimum time and its ejection velocity reaches the maximum. The optimal dwelling time can be further identified it relates to a pressure wave oscillation within the device. The optimal dwelling time can be approximated as the length (L) of the piezoelectric inkjet device divide by the speed of sound (c) in the dispensed fluid.