Hewlett-Packard Development Company, L.p.

Jordan E Morris

Eric T Martin

James Michael Gardner

Daryl E Anderson

James Richard Przybyla

The fluid ejection device includes a plurality of nozzles and a plurality of ejection chambers that includes a respective ejection chamber fluidically coupled to a respective nozzle. A plurality of inlet passages are fluidically coupled to the ejection chambers and input fluid to the ejection chambers at a first pressure. A plurality of outlet passages are fluidically coupled to the ejection chambers and output fluid from the ejection chambers at a second pressure that is less than the first pressure. Fluid circulates through the ejection chambers based on the pressure difference between the first and second pressure. The fluid ejection device also includes at least one micropump fluidically coupled to at least one ejection chamber to pump fluid through the at least one ejection chamber.

Fluid ejection with micropumps and pressure-difference based fluid flow

A fluid ejection system may include a fluidic die comprising at least one fluid ejection device, at least one electrical impedance sensor to detect at least one impedance value during a plurality of stages of existence of a drive bubble in at least one firing chamber associated with the at least one fluid ejection device, and a service station wherein, based on the impedance values detected, the printing system services the at least one fluid actuator.

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Vancouver, WA, United States of America

Jordan E Morris