Patent ID: 8123335

Claim:
A liquid droplet ejecting head comprising: a nozzle that ejects a liquid droplet; a liquid flow path member at which a liquid flow path that supplies a liquid toward the nozzle is formed; a back pressure generating unit that applies back pressure to the liquid in the liquid flow path toward the nozzle; a beam member joined together with the liquid flow path member or including the liquid flow path member, that deforms so as to become concave in a liquid droplet ejection direction, thereafter undergoes buckling reverse deformation so as to become convex in the liquid droplet ejection direction, and applies inertia to the liquid in the vicinity of the nozzle in the ejection direction, to cause the liquid in the vicinity of the nozzle to be ejected from the nozzle as a liquid droplet; an opening that is disposed on an opposite side of the liquid flow path member to a side in the ejection direction and is communicated with the external atmosphere; a suction path whose suction opening is directed toward the vicinity of the nozzle; and a negative pressure generating unit that generates negative pressure in the suction path; wherein, as seen from the ejection direction, a center of the opening is offset toward the suction path from a center of the nozzle, a distance from the center of the nozzle to an end of the opening at a suction path side is in a range from 3 times to 10 times the diameter of the nozzle, and a distance from the center of the nozzle to an end of the opening at the farthest side from the suction path is in a range of equal to or less than 3 times the diameter of the nozzle.