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US 2012/0056943 A1Published application
Fluid-ejection printhead die having an electrochemical cell
AssigneeHewlett-Packard Development Company, L.P.
InventorsJeffrey A. Nielsen, Sadiq Bengali, Greg Scott Long, Joshua M. Yu
Life of this patent
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Abstract
A fluid-ejection printhead die includes a fluid-ejection firing element and an electrochemical cell. The fluid-ejection firing element is to cause droplets of fluid to be ejected from the fluid-ejection printhead die. The electrochemical cell is to measure an electrical property of the fluid. The fluid-ejection firing element and the electrochemical cell are both part of the fluid-ejection printhead die.
Claims15
A fluid-ejection printhead die comprising:
- a fluid-ejection firing element to cause droplets of fluid to be ejected from the fluid-ejection printhead die;
- and,
- an electrochemical cell to measure an electrical property of the fluid,
- wherein the fluid-ejection firing element and the electrochemical cell are both part of the fluid-ejection printhead die.
1 more element
A fluid-ejection device comprising:
- a fluid-ejection printhead die to cause droplets of fluid to be ejected, and having an electrochemical cell to measure an electrical property of the fluid;
- an electrical circuit to determine a characterization of the fluid based on the electrical property of the fluid measured by the electrochemical cell;
- and,
- a controller to control the electrical circuit to determine the characterization of the fluid, and to determine a type of the fluid based on the characterization of the fluid.
1 more element
A method comprising:
- counting a number of clock cycles that elapse until an electrical circuit connected to an electrochemical cell of a fluid-ejection printhead die outputs a logic one;
- dividing the number of clock cycles by a clock frequency to yield a tau parameter of a resistive-capacitive response of fluid within the fluid-ejection printhead die;
- and,
- determining a type of the fluid based on the tau parameter.
1 more element
Dependencies are inferred from the claim text.