Patent ID: 6354686
Filing Date: 2002-03-12
Classification: B41J

Abstract:
An ink jet recording apparatus comprising:a recording head reciprocately moving in a main scanning direction with regard to a recording medium, the recording head provided with: a nozzle orifice from which an ink drop is ejected; a pressure chamber communicated with the nozzle orifice; and a pressure generating element for generating pressure change in ink in the pressure chamber; a drive signal generator for generating a drive signal in which a plurality of drive pulses configured to drive the pressure generating element to eject an ink drop from the nozzle orifice, respectively, the drive signal including: a first drive pulse configured to drive the pressure generating element to eject an ink drop from the nozzle orifice, and to have a reference bias level; a second drive pulse configured to drive the pressure generating element to eject an ink drop from the nozzle orifice, and to have an individual bias level which is different from the reference bias level; a ready waveform for varying a potential of the drive signal from the reference bias level to the individual bias level, which is arranged in the drive signal so as to precede to the second drive pulse; and a recovery waveform for varying the potential of the drive signal from the individual bias level to the reference bias level, which is arranged in the drive signal so as to follow the second drive signal; and a drive pulse selector for selectively supplying at least one of the drive pulses and the waveforms in the drive signal to the pressure generating element to eject an ink drop from the nozzle orifice, wherein the drive pulse selector selects the second drive pulse together with the ready waveform and the recovery waveform.