Patent ID: 7588322

Claim:
A liquid droplet discharging piezoelectric device for use in discharging micro liquid droplets provided with: a cavity member in which a cavity to be filled with a liquid is built; an introduction member having an introduction channel which connects with the cavity and an introduction port from which the liquid is introduced into the cavity via the introduction channel; and a nozzle member having a nozzle channel which connects with the cavity on a side of the cavity member opposite to the introduction channel and a discharge port to discharge the liquid with which the cavity has been filled as droplets via the nozzle channel, wherein at least a part of the cavity member comprises a piezoelectric driving body in which a plurality of layered piezoelectric bodies made of a ceramic material and a plurality of layered electrodes are alternately laminated, at least a part of the introduction member and/or the nozzle member comprises a piezoelectric body made of the ceramic material, and the cavity member, the introduction member and/or the nozzle member is integrally formed by sintering, and wherein a displacement based on an electrically inductive strain of the piezoelectric driving body composing at least a part of the cavity member generates a pressing force accompanied by an increase of a pressure in the cavity of the cavity member; and the liquid with which the cavity has been filled is discharged as droplets from the discharge port by use of the pressing force.