Ink-droplet ejecting apparatus

An ink-droplet ejecting apparatus comprising:

• a plurality of ink passages each of which comprises a pressure chamber filled with ink;
• a plurality of actuators each of which is configured to change, upon receiving a drive signal, an inner volume of one of the pressure chambers to generate a pressure wave in the ink in the pressure chamber which wave propagates along a corresponding one of the ink passages to eject a droplet of the ink onto a recording medium;
• and
• a control unit which is connected to the plurality of actuators and is configured to supply the drive signal to the actuators, such that the drive signal comprises a waveform which is for forming a single dot on the recording medium and comprises (i) a main pulse which ejects the droplet, (ii) a preceding pulse outputted before the main pulse, and (iii) a stabilizing pulse outputted after the main pulse, a pulse width of the main pulse being not coincident with a one-way propagation time AL which is a time taken by the pressure wave to propagate one way along the ink passage, the preceding pulse being outputted in a manner not to eject the droplet, and the stabilizing pulse being outputted in a manner to pull back a part of the droplet as beginning to be ejected by the main pulse,
• wherein each of the preceding pulse, the main pulse, and the stabilizing pulse increases the inner volume of the pressure chamber at a start of each pulse and decreases the inner volume at a terminal end of each pulse.