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Shutter ink jet

  • US 6,485,123 B2
  • Filed: 05/14/2001
  • Issued: 11/26/2002
  • Est. Priority Date: 07/15/1997
  • Status: Expired due to Fees
First Claim
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1. A method of operating an ink jet printhead that includes a plurality of nozzle arrangements, each nozzle arrangement defining a nozzle chamber and an ink ejection port in fluid communication with the nozzle chamber, and a closure that is operatively positioned wityh respect to the ink ejection port, the closure being displaceable between open and closed positions to open and close the ink ejection port, respectively, on receipt of an electrical signal, the nozzle chamber being in fluid communication with an ink reservoir, the method comprising the steps of:

  • maintaining each closure in the closed position;

    subjecting ink in the ink reservoir and thus each nozzle chamber to an oscillating pressure, selectively and independently supplying each closure with an electrical signal to displace the closure into the open position so that an ink droplet is ejected from the ink ejection port as a result of the oscillating pressure.

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