Patent ID: 8287071
Filing Date: 2012-10-16
Classification: B41J

Abstract:
1. An inkjet recording apparatus comprising: a recording head having a nozzle to eject an ink droplet, a pressure chamber connected to the nozzle, and a pressure generation section to vary a volume of the pressure chamber; and a drive signal generator which generates a drive signal for applying at least one drive pulse within one pixel period to eject the ink droplet, wherein the inkjet recording apparatus is configured to eject the ink droplet from the nozzle by applying the drive signal to activate the pressure generation section, wherein the drive signal generator is configured to generate the drive signal within one pixel period in chronological order including a first expansion pulse to expand the volume of the pressure chamber, a contraction pulse to contract the volume of the pressure chamber, and a second expansion pulse to expand the volume of the pressure chamber again, and wherein a pulse width of the first expansion pulse is greater than 0.8 AL and less than 1.3 AL, a pulse width of the contraction pulse is not less than 0.1 AL and not more than 0.5 AL, where AL represents a half of an acoustic resonance period of the pressure chamber, and |Von|/|Voff| is not less than 1.3 and not more than 10, where Von represents a drive voltage of the first expansion pulse, and Voff represents a drive voltage of the contraction pulse.