US Patent 7410232 Ink-droplet ejecting apparatus

An ink-droplet ejecting apparatus includes a nozzle; an ink pressure chamber; an actuator which produces a pressure wave in the ink; and a control device which, when a first print command corresponding to a first print period for ejecting the ink and a second print command corresponding to a second print period next to the first print period for ejecting the ink, outputs, within the first print period, a first drive waveform for driving the actuator, and which, when the first print command is to eject the ink and the second print command is not to eject the ink, outputs a second drive waveform extending over the first and second print periods. The control device outputs, as the second drive waveform, a first ejecting pulse signal, then a first canceling pulse signal, then a second ejecting pulse signal and then a second canceling pulse signal driving the actuator.