Sub-Threshold Voltage Priming of Inkjet Devices to Minimize First Drop Dissimilarity in Drop on Demand Mode

摘要

A method for precisely depositing the same amount of a particular substance at one or more locations on an object by minimizing first drop dissimilarity is described. The method comprises:
positioning an object in proximity to an inkjet printing device having one or more channels with nozzles such that relative movement between the object and the inkjet printing device is achievable;
establishing first acoustic waves within the one or more channels at a preselected frequency and having a first amplitude below the threshold required to create a releasable drop of a particular substance from the nozzle, thereby creating a stable acoustic environment within the one or more channels; and
periodically generating bursts of second acoustic waves within the one or more channels, interrupting the first acoustic waves, at a preselected frequency and having a second amplitude above the threshold to create a releasable drop of a particular substance from the nozzle for deposition on the object.