Patent ID: 7240996

Claim:
A liquid delivering apparatus, comprising: a unimorph-deformation piezoelectric actuator including: a piezoelectric sheet which is opposed to a plurality of liquid chambers for accommodating a liquid and which is polarized in a direction of thickness thereof; a restrictor sheet which is opposed to the liquid chambers, which restricts a deformation of the piezoelectric sheet, and which functions as a first electrode; and a plurality of second electrodes which are opposed, via a plurality of active portions of the piezoelectric sheet, to a plurality of restrictive portions of the restrictor sheet, respectively, and are opposed to the liquid chambers, respectively, wherein when an arbitrary one of the active portions of the piezoelectric sheet is deformed by an electric field which is generated in a direction substantially parallel to the direction of polarization of the piezoelectric sheet, the arbitrary one of the active portions of the piezoelectric sheet and a corresponding one of the restrictive portions of the restrictor sheet are curved in a direction to increase a volume of a corresponding one of the liquid chambers.