Nozzle characteristics
AssigneeHewlett-Packard Development Company, L.P.
InventorsCraig Olbrich, Joseph M Torgerson
Life of this patent
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Abstract
Examples include a fluid ejection device. The fluid ejection device comprises a fluid ejection die and a control engine. The fluid ejection die comprises nozzles to eject fluid drops and a temperature sensors disposed on the die to sense temperatures associated with nozzles. The control engine determines at least one nozzle characteristic of at least one respective nozzle based at least in part on a temperature change associated with the at least one respective nozzle corresponding to at least one ejection event.
Claims8
A fluid ejection device comprising:
- a fluid ejection die comprising a plurality of nozzles to eject fluid drops, the fluid ejection die further comprising a plurality of temperature sensors disposed thereon to sense temperatures associated with nozzles of the plurality of nozzles;
- and
- a control engine:
- to determine at least one nozzle characteristic for at least one respective nozzle of the plurality of nozzles based at least in part on a temperature change associated with the at least one respective nozzle corresponding to at least one ejection event;
- and
- to control the fluid ejection die to eject drops of fluid for a set of ejection events for a servicing operation;
- wherein the at least one ejection event comprises the set of ejection events for the servicing operation, and the temperature change corresponds to the set of ejection events for the servicing operation, and the control engine is to determine the at least one nozzle characteristic for at least one respective nozzle based at least in part on the temperature change corresponding to the set of ejection events for the servicing operation.
A method for a fluid ejection device, comprising:
- ejecting fluid via at least one nozzle of at least one fluid ejection die of the fluid ejection device for at least one ejection event;
- during ejecting of the fluid via the nozzles of the at least one fluid ejection die of the fluid ejection device for the at least one ejection event, monitoring a temperature associated with the at least one nozzle with at least one temperature sensor disposed on the at least one fluid ejection die;
- and
- determining at least one nozzle characteristic of the at least one nozzle based at least in part on a rate of change of temperature associated with the at least one nozzle corresponding to the at least one ejection event wherein the rate of change of temperature of the fluid ejection die corresponds to an ejected volume of fluid for the at least one ejection event, an expected rate of change of temperature corresponds to an expected volume of fluid for the at least one ejection event, the at least one nozzle characteristic comprises an operational status of the at least one nozzle, and the operational status of the at least one nozzle is determined to be non-operative based on the ejected volume of fluid for the at least one ejection event being less than the expected volume of fluid for the at least one ejection event.
Dependencies are inferred from the claim text.