Patent ID: 6779866
Filing Date: 2004-08-24
Classification: B41J

Abstract:
A liquid jetting apparatus, comprising:a jetting head, provided with a nozzle orifice, a pressure chamber communicated with the nozzle orifice, and a piezoelectric element which is deformable to cause pressure fluctuation to liquid contained in the pressure chamber; a drive signal generator, which simultaneously generates a plurality of drive signals, each provided with waveform elements including at least one drive pulse in every unit jetting cycle, the drive pulse deforming the piezoelectric element to cause such pressure fluctuation as to eject a liquid droplet from the nozzle orifice; a switcher, which selectively supplies at least one of the waveform elements included in one of the drive signals to the piezoelectric element; and a switch controller, which controls a selective supply operation of the switcher in accordance with amount data which indicates an amount of the liquid droplet to be ejected, wherein a time period in which the drive pulse is generated in one of the drive signal and that in another one of the drive signals overlap at least partly.