Piezoelectric actuator with terminals on common plane, ink-jet head provided with the same, ink-jet printer, and method for manufacturing piezoelectric actuator

A piezoelectric actuator comprising:

• a piezoelectric layer;
• a vibration plate provided on one surface of the piezoelectric layer;
• a plurality of individual electrodes interposed between the piezoelectric layer and the vibration plate;
• a common electrode provided on the other surface of the piezoelectric layer and common to the individual electrodes;
• a plurality of first terminals formed on a same plane as the individual electrodes and each associated with one of the individual electrodes;
• a plurality of first wiring formed on the same plane as the individual electrodes and each electrically connecting one of the individual electrodes and one of the first terminals;
• a second terminal formed on the same plane as the individual electrodes and associated with the common electrode;
• and
• a second wiring electrically connecting the common electrode and the second terminal.