| 摘要 |
A method of ejecting at least one droplet of an ink through a nozzle by applying a drive pulse signal having pulses to an actuator which changes a capacity of an ink chamber, for forming a dot corresponding to one picture element with a result of ejection of the droplet, the dot to be formed being selected from among a medium-volume dot constituted by the ink of a predetermined amount, a small-volume dot constituted by the ink whose amount is smaller than the predetermined amount, and a large-volume dot constituted by the ink whose amount is larger than the predetermined amount. In the method, where the small-volume dot is formed, the droplet is ejected by a first drive pulse signal as the drive pulse signal set for the small-volume dot to eject the droplet at a predetermined ejecting speed. Further, where the medium-volume or large-volume dot is formed, the at least one droplet is ejected by a second drive pulse signal as the drive pulse signal which is set for the medium-volume or large-volume dot, which has the same voltage as the first drive pulse signal, and which has a plurality of pulses. The second drive pulse signal is determined such that a pulse width of each pulse and a time interval between each pulse are equal to respective prescribed values for making an ejecting speed of the droplet for forming the medium-volume or large-volume dot equal to the predetermined ejecting speed of the at least one droplet for forming the small-volume dot.
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