| 摘要 |
<p>The drive signal supplied to the piezoelectric vibrator includes the expansion waveform elements (P1, P2, and P3) for expanding the pressure generating chamber, the contraction waveform element (P5) for contracting the pressure generating chamber expanded by the expansion waveform element and jetting an ink drop from the nozzle opening, and the vibration damping waveform element (P7) changing from the terminal voltage (VL) of the contraction waveform element (P5) to the vibration damping voltage (VM) so as to suppress the residual vibration of the meniscus of the pressure generating chamber after jetting an ink drop. The initial and terminal voltages of the drive signal are equal to each other and equivalent to the standby voltage (VL) set as a voltage of the piezoelectric vibrator at the time of non-supply of the drive signal. The vibration damping voltage (VM) lies between the standby voltage VL and the maximum voltage VH of the drive signal. Accidental jetting of ink drops, at the time of recovery of the vibrator voltage using the voltage recovery device, can surely be prevented.</p> |
