Patent ID: 7364269

Claim:
An inkjet printhead comprising: a monolithic wafer having a droplet ejection side and a liquid supply side; a plurality of nozzles formed in a planar array parallel to the droplet ejection side; a plurality of droplet ejection actuators and associated drive circuitry corresponding to each nozzle respectively, the ejection actuators being formed in respective nozzle chambers on the droplet ejection side such that each of the nozzles is in fluid communication with one of the chambers respectively, the chambers being formed between the drive circuitry and the planar array of nozzles; and, a plurality of liquid passages extending from each of the chambers respectively to the liquid supply side for supply each of the nozzles with liquid; wherein, each of the liquid passages is formed by a hole extending from the respective chamber, through the drive circuitry and into the monolithic wafer, and a supply passage extending from the liquid supply side partially through the monolithic wafer such that a fluid connection is established with the hole, the supply passage and the chamber being wider than the hole.