Piezoelectric actuation mechanism

A method comprising:

• applying one or more voltages to one or more of a discrete center electrode, a first discrete sidewall electrode, and a second discrete sidewall electrode for a chamber of an inkjet piezoelectric actuation mechanism, the discrete center electrode disposed over a center of the chamber, the first discrete sidewall electrode disposed over a first sidewall of the chamber, and the second discrete sidewall electrode disposed over a second sidewall of the chamber;
• and,
• ejecting an ink droplet as resulting from application of the one or more voltages to the one or more of the discrete center electrode, the first discrete sidewall electrode, and the second discrete sidewall electrode for the chamber of the inkjet piezoelectric actuation mechanism,
• wherein the inkjet piezoelectric actuation mechanism includes a piezoceramic sheet disposed over a common electrode disposed over a flexible diaphragm disposed over a substrate defining a plurality of chambers including the chamber, to enable the ink droplet to be ejected by applying the one or more voltages to the one or more of the discrete center electrode, the first discrete sidewall electrode, and the second discrete sidewall electrode for the chamber of the inkjet piezoelectric actuation mechanism.

A piezoelectric inkjet printing device comprising:

• an inkjet piezoelectric actuation mechanism to eject ink droplets from a supply of ink of the piezoelectric inkjet printing device onto media, the inkjet piezoelectric actuation mechanism comprising:
• a substrate having a plurality of chambers defined therein, each chamber having a first sidewall and a second sidewall;
• a flexible diaphragm disposed over the chambers of the substrate and mounted to the first and the second sidewalls of each chamber;
• a common electrode disposed over the flexible diaphragm, the common electrode common to all the chambers;
• a piezoceramic sheet disposed over the common electrode;
• and,
• for each chamber, a discrete center electrode disposed over a center of the chamber, a first discrete sidewall electrode disposed over the first sidewall of the chamber, and a second discrete sidewall electrode disposed over the second sidewall of the chamber.