Patent ID: 8960833
Filing Date: 2015-02-24
Classification: B41J

Abstract:
1. An ink jet recording device comprising: an ink jet recording head including a pressure chamber that communicates with an ink ejection orifice, and a piezoelectric actuator that changes a pressure of ink in the pressure chamber; a drive signal generating unit that generates a drive waveform having multiple drive pulses; and a pulse supplying unit that selects one or more of the drive pulses from the drive waveform depending on a size of an ink drop to be ejected from the ink ejection orifice and supplies the selected drive pulses to the piezoelectric actuator, wherein: the multiple drive pulses in the drive waveform comprise a plurality of ejection pulses to eject the ink drop from the ink ejection orifice and a non-ejection pulse to suppress residual oscillations of the ink following the ejection pulses, the pulse supplying unit is configured to select one or more of the plurality of ejection pulses and the non-ejection pulse from the drive waveform when an ink drop having a maximum size is to be ejected from the ink ejection orifice, the multiple drive pulses in the drive waveform comprise a final ejection pulse located at a tail-end position of the drive waveform to eject the ink drop, and the pulse supplying unit is configured to select the final ejection pulse from drive waveform when the ink drop having the maximum size is to be ejected, and the multiple drive pulses in the drive waveform comprise a fine oscillation pulse located between the non-ejection pulse and the final ejection pulse to pressurize the ink in the pressure chamber without ejecting the ink drop, and the pulse supplying unit is configured to select the fine oscillation pulse from the drive waveform when the ink drop having the maximum size is to be ejected.