Patent ID: 7396096

Claim:
An inkjet recording device comprising: a nozzle module having a plurality of nozzles for ejecting ink droplets and a plurality of piezoelectric elements each including a common electrode and an individual electrode wherein the piezoelectric element is deformed when a potential difference is generated between the common electrode and the individual electrode, the nozzles being provided in one-to-one correspondence with the piezoelectric elements wherein each nozzle ejects the ink droplet in accordance with deformation of the corresponding piezoelectric element; a switching unit including one terminal connected to the individual electrode and another terminal grounded, the switching unit arranged to open and close in response to a switch pulse, with an opening duration of the switch unit being variable depending on the switch pulse; a waveform generating unit for applying a drive voltage to the common electrodes of all the nozzles commonly; an image recognizing unit for receiving an ejection data indicating a type of each of a plurality of pixels of an image to be recorded, wherein the image recognizing unit is arranged for identifying blocks of said pixels and identifying an internal pixel from each of said blocks, and is arranged for generating a switch pulse width data corresponding to each of said blocks based on the ejection data of the internal pixel and the ejection data of other pixels of the block; and a pulse width modulating unit for generating the switch pulse based on the switch pulse width data, wherein the switch pulse width data indicates an ejection condition of ink droplets ejected from different ones of said nozzles.