Ink-jet printing control having printing head driven by two successive drive pulses

摘要

In an ink-jet printing apparatus, a first drive pulse is applied to an actuator of a printing head and then a second drive pulse is applied to the same actuator of the printing head. The second drive pulse has a magnitude equal to that of the first drive pulse and a pulse width equal to approximately 0.20 to 0.40 times the one-way propagation time T of pressure wave in an ink channel and the second drive pulse is terminated within a range of approximately 2.60 to 2.80 times the one-way propagation time T from an end time of the first drive pulse. This control suppresses effectively the residual pressure wave vibration thereby to reduce variations in the ink ejection speed even when the actuator driving frequency changes.