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Pagewidth inkjet printhead assembly with nozzle arrangements having actuator arms configured to be in thermal balance when in a quiescent state

  • US 7,562,963 B2
  • Filed: 05/08/2008
  • Issued: 07/21/2009
  • Est. Priority Date: 10/16/1998
  • Status: Expired due to Fees
First Claim
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1. A pagewidth inkjet printhead assembly having a plurality of nozzle arrangements each comprising:

  • walls defining an ink chamber having an ink supply channel and an ink ejection port having an ink spreading prevention rim; and

    a thermal actuator mechanism configured to operatively eject ink from the chamber via the ejection port, wherein the mechanism includes an actuator arm having two layers which are formed from a conductive, resiliently flexible material, said layers surrounding a central material layer so that said two layers are in thermal balance with the arm in a quiescent state.

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