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Energy control method for an inkjet print cartridge

  • US 6,315,381 B1
  • Filed: 04/30/1998
  • Issued: 11/13/2001
  • Est. Priority Date: 10/28/1997
  • Status: Expired due to Fees
First Claim
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1. A method of calibrating an inkjet print cartridge having a plurality of ink firing resistor groupings each containing at least one resistor and a memory device, the method comprising the steps:

  • selecting the desired pulse width, minimum over-energy and maximum over-energy;

    measuring a turn-on voltage for each of the plurality of ink firing resistor groupings for the selected pulse width by applying the selected pulse width to each of the plurality of ink firing resistor groupings;

    calculating an operating voltage for at least one of the plurality of ink firing resistor groupings from the minimum over-energy;

    calculating a maximum voltage for at least one of the plurality of ink firing resistor groupings from the maximum over-energy;

    setting the operating voltage equal to the maximum voltage;

    varying the operating voltage to find a maximum operating voltage;

    setting the operating voltage equal to the maximum operating voltage found; and

    writing the operating voltage to the memory device.

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