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Ink jet nozzle assembly with linearly constrained actuator

  • US 7,506,969 B2
  • Filed: 02/16/2007
  • Issued: 03/24/2009
  • Est. Priority Date: 07/15/1997
  • Status: Expired due to Fees
First Claim
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1. An ink jet nozzle assembly for an inkjet printer, the nozzle assembly comprising:

  • a wafer substrate arrangement defining an ink supply passage;

    a drive circuitry layer formed on the wafer substrate arrangement;

    an ink chamber structure on the drive circuitry layer, the ink chamber structure defining an ink chamber in fluid communication with the ink supply passage and an ink ejection port in fluid communication with the ink chamber, the ink chamber structure further defining an actuator guide slot;

    a support extending from the drive circuitry layer at a location external to the nozzle; and

    an elongate, cantilevered thermal bend actuator extending from a fixed end at the support, through the guide slot and terminating in a free end within the ink chamber;

    the actuator comprising a first layer having a first co-efficient of thermal expansion, and a second layer deposited on the first layer which has a second co-efficient of thermal expansion different to said first co-efficient of thermal expansion;

    the first layer being electrically coupled to the drive circuitry layer so that the drive circuitry layer can actuate bending of the thermal bend actuator to move the free end, which is constrained to substantially linear motion by the guide slot, and thereby eject ink from the ink ejection port.

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