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US 9,849,672 B2Granted
Fluid ejection apparatus including a parasitic resistor
AssigneeHewlett-Packard Development Company, L.P.
InventorsNing Ge, Hang-Ru Goy, Boon Bing Ng, Shane O'Brien, Mun Hooi Yaow
Life of this patent
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Abstract
An example provides a fluid ejection apparatus including a first firing resistor and a second firing resistor to selectively cause fluid to be ejected through a single nozzle, and a parasitic resistor arranged to add a parasitic resistance to the first firing resistor.
Claims20
A fluid ejection apparatus comprising:
- a first firing resistor and a second firing resistor to selectively cause fluid to be ejected through a single nozzle;
- and
- a parasitic resistor arranged to add a parasitic resistance to the first firing resistor.
A fluid ejection system comprising:
- a fluid reservoir;
- a printhead to receive a fluid from the fluid reservoir, the printhead including:
- a nozzle;
- a fluid chamber fluidically coupled to the fluid reservoir;
- a first firing resistor to thermally eject the fluid from the fluid chamber through the nozzle;
- a second firing resistor to thermally eject the fluid from the fluid chamber through the nozzle;
- and
- a parasitic resistor connected in series with the first firing resistor to add a parasitic resistance to the first firing resistor to control an amount of energy across the first firing resistor;
- and
- select circuitry to facilitate, at least in part, ejection of the fluid by the first firing resistor, by the second firing resistor, or by the first firing resistor and the second firing resistor.
7 more elements
A method for making a fluid ejection apparatus, comprising:
- forming a parasitic resistor over a substrate;
- forming a first firing resistor and a second firing resistor over the substrate such that the parasitic resistor is electrically coupled in series to the first firing resistor to add a parasitic resistance to the first firing resistor;
- forming a fluid chamber over the first firing resistor and the second firing resistor;
- and
- forming a nozzle fluidically coupled to the fluid chamber.
2 more elements
Dependencies are inferred from the claim text.