Abstract
This study used an equivalent circuit model to collectively analyze the oscillation phenomena inside a piezo-inkjet printhead as an electrical oscillation. We propose a new equivalent circuit model that can accurately predict fluctuations in the ink ejection velocity due to meniscus oscillation. Our experimental results for the dependency of the ink ejection velocity on the pulse width of the input waveform included a nonlinear effect having no fixed period. Our new model uses a nonlinear acoustic resistance characterized by the sum of a square function and sine function. The new equivalent circuit model was incorporated into the LTspice behavioral modeling calculations. A good match was observed between the experimental results for the inkjet ejection velocity and results calculated by the model.
Highlights
Inkjet printers use digital data rather than printing plates to create the required patterns
We found that a “vortex” was created as fluid passes through the orifice, indicating nonlinearity in acoustic resistance to flow velocity
We have proposed a nonlinear piezo-inkjet equivalent circuit model that can predict the ink ejection velocity fluctuations caused by the meniscus oscillation of an inkjet by incorporating these fluctuations as the resistance coefficient A(ICm)
Summary
Inkjet printers use digital data rather than printing plates to create the required patterns. A technology has been developed to add electrical functions to manufacture goods by printing directly onto three-dimensional objects.[1,2,3,4] In the manufacturing of electronic products using inkjets, the ink that solidifies by heat, such as metal nanoparticles,[5–7] is frequently used, and sintering is performed after printing to develop electrical functions.[8–13]. In this case, thermal inkjet[14–16] technology is not applicable because the ink may solidify in the inkjet printhead.
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