Patent ID: 6962402
Filing Date: 2005-11-08
Classification: B41J,Y10T

Abstract:
1. An inkjet printhead comprising: a wafer providing a supporting substrate, the wafer having a drop ejection side and a liquid supply side; a plurality of nozzles, each nozzle having a liquid passage leading to it from the liquid supply side of the wafer for providing ejectable liquid to the nozzle; drop ejection actuators and associated drive circuitry corresponding to each nozzle respectively; the nozzles, ejection actuators, associated drive circuitry and liquid passage being formed on and through the wafer using lithographically masked etching techniques; wherein, each of the liquid passages is formed by etching a blind hole into the wafer from the drop ejection side, and etching a supply passage from the liquid supply side of the wafer to the hole; such that, the blind hole extends into the wafer passed the drive circuitry; and, the supply passage is etched to a depth that extends passed the blind end of the hole by an overlap greater than the sum of the fabrication tolerances of both etch processes.