Liquid-jet head and liquid-jet apparatus

Abstract

Provided are a liquid-jet head and a liquid-jet apparatus, which can obtain a stable liquid ejecting property. A liquid-jet head includes: a passage-forming substrate in which a plurality of pressure generating chambers communicating with nozzle orifices ejecting a liquid are formed; piezoelectric elements which are provided in a region facing the pressure generating chambers on one side the passage-forming substrate with a vibration plate interposed therebetween and each of which includes a lower electrode, a piezoelectric layer and an upper electrode; a lead electrode for the upper electrode, which is drawn out from the upper electrode; and a lead electrode for the lower electrode, which is drawn out from the lower electrode. In the liquid-jet head, the lower electrode is a common electrode which is continuously provided in the region facing the plurality of arranged pressure generating chambers. In addition, at least an end on one side of the lower electrode in a direction perpendicular to an arrangement direction of the pressure generating chambers is positioned in the region facing the pressure generating chambers. Moreover, the lead electrode for the lower electrode is provided outside of a region corresponding to a space between the pressure generating chambers. The lead electrode for the lower electrode is connected through a common lead portion extended from the lower electrode. Alternatively, the lead electrode for the lower electrode is formed of an adhesion layer and a metal layer, and only the adhesion layer is extended to reach the lower electrode.

Dependencies are inferred from the claim text.