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US 2013/0278656 A1Published application
Determining an Issue with an Inkjet Nozzle Using an Impedance Difference
AssigneeHewlett-Packard Development Company, L.P.
InventorsAlexander Govyadinov, Andrew L. Van Brocklin, Eric T. Martin, David Maxfield
Life of this patent
Estimating the term…
Abstract
A method for determining an issue with an inkjet nozzle using an impedance difference includes taking a first impedance measurement with a sensor to detect a drive bubble in an ink chamber after a drive bubble formation mechanism is activated; and subtracting the first impedance measurement from a reference.
Claims15
A method for determining an issue with an inkjet nozzle using an impedance difference, the method comprising:
- taking a first impedance measurement with a sensor to detect a drive bubble in an ink chamber after a drive bubble formation mechanism is activated;
- and
- subtracting said first impedance measurement from a reference.
An ink jet print head, comprising,
- a first ink chamber comprising a drive bubble formation mechanism and an impedance sensor positioned to detect a presence of a drive bubble in said first ink chamber;
- and
- said impedance sensor being in communication with a processor programmed to determine a difference between an impedance measurement taken with said impedance sensor and an impedance reference value.
A printer, comprising,
- an ink chamber comprising a drive bubble formation mechanism and a first impedance sensor and a second impedance sensor positioned within said ink chamber to detect a presence of a bubble;
- and
- said first and second impedance sensors being in communication with a differential amplifier programmed to determine a difference between a first impedance measurement taken with said first impedance sensor and a second impedance measurement taken with said second impedance sensor.
Dependencies are inferred from the claim text.