| 摘要 |
<p>The purpose of the present invention is to, when a drive signal is applied in a drive cycle subsequent to a non-discharge drive cycle, stabilize the droplet speed when the drive signal is applied in the subsequent drive cycle by generating a reverberation pressure wave equal to that when the drive signal is applied also in the non-discharge drive cycle to thereby reduce droplet speed variation. A drive signal (Pa) to be applied to a pressure application means includes an expansion pulse for expanding the volume of a pressure generation chamber, maintaining an expanded state for a given period, and thereafter returning the volume to an original volume, the expansion maintenance period of the expansion pulse is 0.8-1.2 Tc (Tc is a half of the cycle of pressure oscillation generated in the pressure generation chamber), and when a drive cycle in which discharge is not performed is present at least immediately before a drive cycle in which discharge is performed, an adjustment pulse (Pb) for not discharging ink is applied, the adjustment pulse being composed of a contraction pulse for contracting the volume of the pressure generation chamber after 0.8-1.2 Tc from the start of the drive cycle in which the discharge is not performed, maintaining a contracted state for a given period, and thereafter returning the volume to an original volume, and having a contraction maintenance period of 0.8-1.2 Tc.</p> |
