Opposed ejection ports and ink inlets in an ink jet printhead chip

摘要

A printhead chip for an ink jet printhead includes an elongate substrate. A plurality of nozzle arrangements is positioned along a length of the substrate. An ink inlet channel is in fluid communication with a respective nozzle arrangement. Each nozzle arrangement includes a nozzle chamber and an ink ejection port. An ink ejection member 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 is generally elongate and has a distal end and an opposed proximal end. The inlet channel of the nozzle chamber is positioned adjacent the proximal end and the ink ejection port is positioned adjacent the distal end. An actuator is mounted on the substrate and is electrically connected to drive circuitry positioned on the substrate to drive the actuator and to the ink ejection member to displace the ink ejection member towards and away from the ink ejection port. The nozzle chamber is 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.