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Nozzle arrangement with an actuator having iris vanes

  • US 8,083,326 B2
  • Filed: 02/07/2011
  • Issued: 12/27/2011
  • Est. Priority Date: 07/15/1997
  • Status: Expired due to Fees
First Claim
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1. A nozzle arrangement for an inkjet printhead, said nozzle arrangement comprising:

  • a substrate defining an ink inlet;

    a plurality of posts extending from the substrate;

    a roof portion defining an ejection port, the roof portion supported by the plurality of posts;

    a plurality of vanes extending from the substrate and arranged to form a wall of a chamber around the ink inlet; and

    a plurality of thermal bend actuators respectively positioned at a base of each vane, each thermal bend actuator having a fixed end in the vicinity of one of the plurality of posts and a displaceable end opposite the fixed end, whereinthe plurality of thermal bend actuator are adapted to bend said vanes inwards with respect to the chamber in an iris-type manner to reduce a volume of the chamber, whereby ink is ejected from the chamber via the ejection port.

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