Patent ID: 10556427

Abstract:
The invention relates to a method for actuating an inkjet print head, comprising at least one printing system having a nozzle on the side of an ink chamber which faces a substrate to be imprinted, and which is delimited at least in areas, preferably in its area facing away from the print substrate, by a diaphragm that is movable away from the ink chamber by electrically actuating a piezo element that is mechanically coupled to the diaphragm, so that ink is drawn into the ink chamber from a reservoir, and the diaphragm is movable into the ink chamber so that an ink drop is ejected from the ink chamber through the nozzle, wherein the printing system made up of the ink chamber, diaphragm, piezo element, and the electronic control system thereof represents an oscillatable structure which, when actuated at high energy, is excited to oscillate at a natural frequency fres that exhibits resonance; i.e. the oscillation with the period Tres=1/fres undergoes little or no attenuation, and wherein the brightness of a pixel to be printed is varied in that, for each pixel, a sequence of multiple ink drops is ejectable in succession from the same nozzle at a time interval of Tdrop=1/fdrop, and energy is only introduced into the printing system via the actuation signal precisely when an ink drop is actually to be ejected.