Patent ID: 8678564

Claim:
Inkjet print head comprising at least one elongated actuation chamber, wherein at least a main part of the actuation chamber substantially extends in a first direction, each actuation chamber associated with a respective piezo actuator arranged to generate a pressure wave in the main part of the actuation chamber, the pressure wave propagating in said first direction; chamber inlet arranged at a first end of the elongated actuation chamber; nozzle arranged in fluid communication with the associated actuation chamber such that a droplet may be expelled through the nozzle upon generation of the pressure wave in the actuation chamber; chamber outlet arranged at a second end of the associated actuation chamber; a reservoir in fluid communication with the chamber inlet and the chamber outlet of the at least one actuation chamber; and a pump means for pumping ink from the reservoir, through the chamber inlet, through the actuation chamber, through the chamber outlet and into said reservoir, wherein a means for reflecting the pressure wave is provided at the second end of the actuation chamber, wherein such means is arranged and configured to generate a sufficient pressure at the nozzle for expelling the droplet, and wherein the means for reflecting the pressure wave comprises a compliance provided at the second end of the actuation chamber.