Patent ID: 8123338

Claim:
A liquid droplet jet head comprising: a pressure liquid chamber substrate including a plurality of nozzles discharging liquid droplets and a plurality of pressure liquid chambers communicated with the nozzles; a vibration board configured to partially form wall surfaces of the pressure liquid chambers; and a first pressure converter configured to vibrate the vibration board to change pressure in the pressure liquid chambers to discharge the liquid droplets from the nozzles, and including a piezoelectric element having an active region and a first inactive region and electrodes disposed to apply an electric force to the active region and not to apply an electric force to the first inactive region, and a groove separating the active region from the first inactive region formed not so deep as to reach one of the electrodes in a portion in the first inactive region facing the vibration board, wherein the pressure liquid chamber substrate is supported by the first inactive region of the piezoelectric element.