Patent ID: 7867450

Claim:
A liquid droplet ejecting head comprising: a nozzle unit having a nozzle capable of ejecting liquid droplets and a pressure generating passage communicating with the nozzle; and a driving unit having a nozzle unit mounting portion and an actuator, wherein the nozzle unit is detachably mounted on the nozzle unit mounting portion, and wherein the actuator changes an inner volume of the pressure generating passage in order to eject the liquid droplets from the nozzle of the nozzle unit mounted on the nozzle unit mounting portion, wherein the nozzle unit has a mount portion detachably mounted on the nozzle unit mounting portion of the driving unit, wherein the mount portion has the pressure generating passage and a passage-side vibration plate that constitutes a part of the pressure generating passage and can vibrate in an out-of-plane direction, wherein the nozzle unit mounting portion comprises a mount hole, the driving unit further comprising a driving-side vibration plate that is disposed in the mount hole and can vibrate in the out-of-plane direction, wherein the actuator comprises a piezoelectric element, and wherein the driving-side vibration plate is disposed at a position that comes in contact with the passage-side vibration plate of the mount portion inserted into the mount hole so as to be vibrated by the piezoelectric element.