Patent ID: 6808254
Filing Date: 2004-10-26
Classification: B41J

Abstract:
An ink jet printer head comprising:a cavity plate formed with at least a first, second, and third column, each column including a plurality of pressure chambers aligned in a row, each pressure chamber having a substantial parallelogram shape with two opposing acute-angled corners, each pressure chamber having an ink-supply-side acute-angle portion located in one acute-angled corner and an ink-ejection-nozzle-side acute-angle portion located in the other acute-angled corner, the ink-supply-side acute-angle portion being formed with an ink supply opening and the ink-ejection-nozzle-side acute-angle portion being formed with an ink ejection nozzle opening, the ejection-nozzle-side acute-angle portions of pressure chambers in the first and second columns being interposed between ejection-nozzle-side acute-angle portions of pressure chambers of the other of the first and second columns, the ejection-nozzle-side acute-angle portions of pressure chambers in the third column being interposed between the ink-supply-side acute-angle portion of pressure chambers in one of the first and second columns; and an actuator in confrontation with the pressure chambers of the cavity plate, the actuator applying ejection pressure to the ink in the ink pressure chambers.