Patent ID: 7410233
Filing Date: 2008-08-12
Classification: B41J

Abstract:
1. A liquid droplet ejecting apparatus comprising: a pressurizing device to be operated by a drive signal; a pressure generation chamber whose volume is expanded and contracted by a movement of the pressurizing device; a liquid droplet ejecting head having a nozzle communicating with the pressure generation chamber; and a drive signal generator which generates the drive signal for operating the pressurizing device, and causing expanding and contracting of a volume of the pressure generation chamber to eject liquid droplets through the nozzle, wherein the drive signal comprises: an expansion pulse to expand the volume of the pressure generation chamber from the volume of a neutral position; a first contraction pulse following the expansion pulse to contract the volume of the pressure generation chamber from the volume of the neutral position; and a second contraction pulse after the first contraction pulse to contract the volume of the pressure generation chamber from the volume of the neutral position, wherein a pulse width of the expansion pulse is 0.7 AL through 1.3 AL, and a pulse width of the first contraction pulse is 0.3 AL through 1.5 AL, where AL is ½ of an acoustic resonance period of the pressure generation chamber.