An ink-jet printing head comprising a flow-passage unit and an actuator unit laminated on each other, wherein the flow-passage unit has nozzles and pressure chambers communicating with the respective nozzles, and the actuator unit is operable to apply pressure to ink in each pressure chamber, and wherein...http://www.google.com.au/patents/US7077510?utm_source=gb-gplus-sharePatent US7077510 - Ink-jet printing head
