Liquid droplet ejecting apparatus and a method of driving a liquid droplet ejecting head

A liquid droplet ejecting apparatus comprising:

• a pressurizing device to be operated by a drive signal;
• a pressure generation chamber whose volume is expanded or 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 expansion or contraction 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;
• a first contraction pulse following the expansion pulse to contract the volume of the pressure generation chamber;
• and
• a second contraction pulse after the first contraction pulse to contract the volume of the pressure generation chamber,
• wherein a pulse width of the expansion pulse is 0.7AL through 1.3AL, and a pulse width of the first contraction pulse is 2.5 AL through 3.5 AL, where AL is ½ of an acoustic resonance period of the pressure generation chamber.

A method of driving a liquid droplet ejecting head by applying a drive signal to a pressurizing device which is operated by drive signals, causing the volume of the pressure generation chamber to expand or contract and ejecting a liquid droplet through a nozzle communicating with the pressure generation chamber,

• wherein the drive signal comprises:
• an expansion pulse to expand the volume of the pressure generation chamber;
• a first contraction pulse following the expansion pulse to contract the volume of the pressure generation chamber;
• and
• a second contraction pulse after the first contraction pulse to contract the volume of the pressure generation chamber,
• wherein a pulse width of the expansion pulse is 0.7AL through 1.3AL, 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.

A method of driving a liquid droplet ejecting head by applying a drive signal to a pressurizing device which is operated by drive signals, causing the volume of the pressure generation chamber to expand or contract and ejecting a liquid droplet through a nozzle communicating with the pressure generation chamber,

• wherein the drive signal comprises:
• an expansion pulse to expand the volume of the pressure generation chamber;
• a first contraction pulse following the expansion pulse to contract the volume of the pressure generation chamber;
• and
• a second contraction pulse after the first contraction pulse to contract the volume of the pressure generation chamber,
• wherein a pulse width of the expansion pulse is 0.7AL through 1.3AL, and a pulse width of the first contraction pulse is 2.5 AL through 3.5 AL, where AL is ½ of an acoustic resonance period of the pressure generation chamber.