Patent ID: 7419244
Filing Date: 2008-09-02
Classification: B41J

Abstract:
1. An ink ejection nozzle arrangement for an inkjet printer, the arrangement comprising: a wafer assembly defining an ink supply channel, and the wafer assembly defining a plurality of spaced apart groups of ink supply channels and a plurality of groups of the ink ejection nozzle arrangements in fluid communication with respective ink supply channel groups; a nozzle chamber structure mounted to the wafer assembly, and defining a nozzle chamber for receiving ink from the ink supply channel and an ink ejection port through which ink in the nozzle chamber can be ejected; an anchor extending from the wafer assembly in a location external to the nozzle chamber; and an elongate thermal actuator mechanism extending from the anchor and into the nozzle chamber, the thermal actuator mechanism comprising an elongate arm which terminates in a free end within the nozzle chamber and a pair of layers of conductive material located on either side of the elongate arm, one of the layers being connected to a current supply so that the free end of the arm can be moved to eject ink in the nozzle chamber through the ink ejection port as a result of differential thermal expansion.