Generate non-uniform electric field to maintain pigments in ink vehicle of printing fluid in nozzle region of printhead
AssigneeHewlett-Packard Development Company, L.P.
InventorsNicholas Matthew Cooper McGuinness, Manish Giri, Chantelle Elizabeth Domingue, Melinda M. Valencia, Jeremy Sells
Life of this patent
Estimating the term…
Abstract
A printhead includes a plurality of firing chambers, a plurality of fluid ejectors, and at least one field generating member. Each one of the firing chambers includes a nozzle region to receive printing fluid. The printing fluid includes an ink vehicle having pigments disposed therein. At least one field generating member generates a non-uniform electric field to apply forces to maintain respective pigments in the ink vehicle of the printing fluid in the nozzle region.
Claims19
A printhead, comprising:
- a plurality of firing chambers comprising chamber inlets and nozzle regions to receive printing fluid including an ink vehicle having pigments disposed therein, each nozzle region including a nozzle inlet, a nozzle outlet, and a nozzle channel disposed between the nozzle inlet and the nozzle outlet;
- a plurality of fluid ejectors disposed in respective firing chambers to eject the printing fluid through the respective nozzle regions;
- and
- a field generating member to generate a non-uniform electric field to apply forces to maintain respective pigments in the ink vehicle of the printing fluid in a first nozzle region of the nozzle regions by reducing separation of the respective pigments from the ink vehicle of the printing fluid in the first nozzle region.
A printhead, comprising:
- a plurality of firing chambers including chamber inlets and nozzle regions to receive printing fluid including an ink vehicle having color pigments disposed therein, each nozzle region including a nozzle inlet, a nozzle outlet, and a nozzle channel disposed between the nozzle inlet and the nozzle outlet;
- a plurality of fluid ejectors disposed in respective firing chambers to eject the printing fluid through the respective nozzle regions;
- and
- a plurality of field generating members having different sizes from each other disposed in the each respective firing chamber of the firing chambers, each of the field generating members to generate a respective non-uniform electric field in response to receiving a signal to apply forces that reduce separation of respective color pigments from the ink vehicle of the printing fluid in a respective nozzle region prior to ejection of the printing fluid through a respective nozzle outlet by a respective fluid ejector.
A method of operating a printhead, the method comprising:
- receiving printing fluid including an ink vehicle and pigments into a firing chamber including a nozzle region having a nozzle inlet, a nozzle outlet, and a nozzle channel disposed between the nozzle inlet and the nozzle outlet of the printhead;
- and
- in response to a signal, generating a non-uniform electric field using a field generating member disposed in the firing chamber to apply forces to reduce separation of respective pigments from the ink vehicle of the printing fluid in the nozzle region.
Dependencies are inferred from the claim text.