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Pagewidth printhead having sealed inkjet actuators

  • US 7,387,368 B2
  • Filed: 12/08/2006
  • Issued: 06/17/2008
  • Est. Priority Date: 10/16/1998
  • Status: Expired due to Fees
First Claim
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1. An inkjet printhead comprising:

  • an elongate ink supply channel defined in a substrate;

    a plurality of inkjet nozzles arranged on the substrate to extend across a pagewidth, each nozzle incorporating;

    an actuator comprising a conductive heater, a paddle and an arm interconnecting the heater and paddle; and

    an ink ejection chamber having a first wall in which a first aperture for ink ejection is defined, a second wall in which a second aperture is defined through which the arm of the actuator passes so that the heater is outside the chamber and the paddle is inside the chamber, and a third wall in which a third aperture is defined through which ink from the ink supply channel is communicated,wherein the arm of each actuator incorporates a protruding shield configured to restrict the flow of ink through the second aperture.

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