| 摘要 |
An ink-droplet ejecting apparatus including a nozzle; a pressure chamber ailed with ink; 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 is to eject the ink and a second print command corresponding to a second print period next to the first print period is to eject the ink, outputs, within the first print period, a first drive waveform so as to drive, a plurality of times, 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, so as to drive, two times, the actuator. Each of the first and second ejecting pulse signals has a pulse length falling in a range of from 0.8AL to 1.2AL, where AL is a one-way propagation time needed for the pressure wave to propagate one way in an ink flow passage which includes the pressure chamber and is connected to the nozzle. The first canceling pulse signal has a pulse length falling in a range of from 1.3AL to 1.8AL, and the second canceling pulse signal has a pulse length falling in a range of from 0.3AL to 0.4AL. A time interval between a trailing end of the first canceling pulse signal and a leading end of the second ejecting pulse signal fall in a range of from 3.0AL to 4.5AL.
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