Patent ID: 6435667
Filing Date: 2002-08-20
Classification: B41J

Abstract:
A printhead chip for an ink jet printhead, the printhead chip comprisingan elongate substrate; and a plurality of nozzle arrangements that are positioned along a length of the substrate, the substrate defining a plurality of ink inlet channels, each ink inlet channel being in fluid communication with a respective nozzle arrangement, each nozzle arrangement comprising nozzle chamber walls and a roof that define a nozzle chamber, the roof defining an ink ejection port; an ink ejection member that is positioned within the nozzle chamber and is displaceable towards and away from the ink ejection port to eject ink from the nozzle chamber, the nozzle chamber walls and the roof being configured so that the nozzle chamber is generally elongate and has a distal end and an opposed proximal end, the ink inlet channel of the nozzle chamber being positioned adjacent the proximal end and the ink ejection port being positioned adjacent the distal end; and an actuator that is mounted on the substrate, the actuator being electrically connected to drive circuitry positioned on the substrate to drive the actuator and the actuator being connected to the ink ejection member to displace the ink ejection member towards and away from the ink ejection port, the nozzle chamber walls and roof being dimensioned so that a fluid flow path defined between the ink ejection port and the ink inlet channel is configured to retard ink flow between the ink ejection port and the ink inlet channel during ejection of ink from the ink ejection port.