| 摘要 |
A drive signal generating unit that generates a drive signal applying, in one pixel period, at least one drive waveform for causing ink droplets to be discharged can generate two types of drive waveforms, a large droplet waveform and a small droplet waveform. The large droplet waveform includes an expansion pulse expanding the volumes of pressure chambers and a contraction pulse making the volumes of the pressure chambers contract. The expansion pulse width of the large droplet waveform is 2.8 AL or longer but 3.4 AL or shorter. The small droplet waveform includes an expansion pulse, a pause period, and a contraction pulse, and the expansion pulse width of the small droplet waveform is 0.8 AL or longer but 1.2 AL or shorter, where AL represents a half of an acoustic resonance period of a pressure wave in the pressure chamber. |
