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US 2023/0054818 A1Published application
Continuous fluid recirculation and recirculation on-demand prior to firing for thermal ejection of fluid having concentration of solids
AssigneeHewlett-Packard Development Company, L.P.
InventorsAlexander Govyadinov, Alex Trubnikov, Ronald Albert Askeland
Life of this patent
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Abstract
Fluid is continuously recirculated through a thermal fluid-ejection printhead. Prior to firing a thermal resistor of the printhead to thermally eject a drop of the fluid through a nozzle of the printhead, the fluid is recirculated on-demand through a chamber of the printhead between the nozzle and the thermal resistor. The thermal resistor is fired to thermally eject the drop of the fluid through the nozzle. The fluid has a concentration of solids greater than 12% by volume.
Claims15
A method comprising:
- continuously recirculating fluid through a thermal fluid-ejection printhead;
- prior to firing a thermal resistor of the printhead to thermally eject a drop of the fluid through a nozzle of the printhead, recirculating the fluid on-demand through a chamber of the printhead between the nozzle and the thermal resistor;
- and
- firing the thermal resistor to thermally eject the drop of the fluid through the nozzle,
- wherein the fluid has a concentration of solids greater than 12% by volume.
2 more elements
A fluid-ejection device comprising:
- a device layer having a backside;
- a chamber layer fluidically connected to the device layer and comprising;
- a thermal resistor that is fired to eject fluid through a nozzle;
- a microfluidic pump at the chamber layer to recirculate the fluid on-demand prior to firing of the thermal resistor;
- and
- a macrofluidic pump to continuously recirculate the fluid through the chamber layer, through the device layer, at the backside of the device layer, through both the chamber layer and the device layer, or both through the chamber layer and at the backside of the device layer,
- wherein the fluid has a concentration of solids greater than 12% by volume.
4 more elements
Dependencies are inferred from the claim text.