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Nozzle arrangement for an inkjet printhead chip that incorporates a nozzle chamber reduction mechanism

  • US 7,520,593 B2
  • Filed: 02/15/2007
  • Issued: 04/21/2009
  • Est. Priority Date: 06/09/1998
  • Status: Expired due to Fees
First Claim
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1. A nozzle arrangement for an inkjet printer, the nozzle arrangement comprising:

  • a wafer assembly defining a nozzle chamber into which ink can be fed;

    a nozzle chamber roof assembly fast with the wafer assembly and covering the nozzle chamber, the nozzle chamber roof assembly defining an ink ejection port supported by a plurality of outwardly extending bridging members, and a plurality of cantilevered actuators interleaved between the bridging members and extending inwardly to terminate in free ends proximal to the ink ejection port; and

    an elongate heater element which extends through each actuator so that, in use, the heater element causes differential thermal expansion in the actuators and thus the free ends of the actuators subsequently to move into the nozzle chamber and force ink therein out through the ink ejection port.

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