Piezo Inkjet Equivalent Circuit Analysis Modeling the Non-Linearity of Fluid Movement near the Orifice

Abstract

In this paper, the phenomena occurring inside the piezo inkjet, which is often used in printable electronics, are divided into "linear phenomena" and "non-linear phenomena". We found that the operating region is usually linear, but in some cases it can be non-linear. After clarifying this, we obtained a calculation result that matches the actual measurement result of the ejection velocity by a method of incorporating the nonlinear phenomenon into the equivalent circuit using element modeling. As a result, we have succeeded in proposing for the first time the possibility that the non-linear phenomenon inside the inkjet is caused by a quadratic functional increase accompanied by oscillation of the acoustic resistance with respect to the flow near the orifice.