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Printhead with integrated nozzle impedance measurement

A printing head and reference impedance technology, which is applied in printing and other directions, can solve problems such as infeasibility

Active Publication Date: 2022-06-28
XEROX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditionally, inkjet impedance sweep measurements have been performed by using a commercial impedance meter wired to one nozzle at a time, and due to the time constraints of continually rewiring the impedance meter to each nozzle, the impedance is performed on all inkjet nozzles of the printhead. Scanning measurements are not feasible

Method used

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  • Printhead with integrated nozzle impedance measurement
  • Printhead with integrated nozzle impedance measurement
  • Printhead with integrated nozzle impedance measurement

Examples

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Embodiment Construction

[0010] Piezoelectric inkjet printheads typically use one or two waveform drive rails to which individual inkjet nozzles are typically connected by electronic selection circuits, such as application specific integrated circuits (ASICs), to fire droplets of ink toward the print medium. For the dual rail case, the positive portion of the waveform is on the VPP drive rail and the negative portion of the waveform is on the VSS drive rail. With no ink jets connected, the base capacitance on each of the drive rails is about 50 nF to 70 nF. Connecting one inkjet nozzle to the drive rail can add an additional capacitance of, for example, 55pF, or roughly 0.1%.

[0011] The printheads of the embodiments herein determine the impedance of each individual inkjet and / or by measuring the additional capacitance of the piezoelectric actuator when it is connected to the drive rail and comparing it to a reference capacitance capacitance, thereby internally measuring the impedance of the piezoel...

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PUM

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Abstract

A printhead comprising: a plurality of piezoelectric actuators; dummy actuators; drive rails; electronic selection circuitry connected to the plurality of piezoelectric actuators, the dummy actuators and each of the drive rails, the electronic selection circuit configured to select at least one of the piezoelectric actuator or the dummy actuator for connection to the drive rail; and a controller coupled to to the drive rail, the controller is configured to generate waveforms to drive the drive rail and measure signals on the drive rail connected to piezo actuators, dummy actuators, or without any connection In the case of an electric actuator or the pseudo-actuator, the signal on the drive rail is measured and the resulting measurement is used to calculate the impedance of the piezoelectric actuator.

Description

technical field [0001] The present disclosure relates to testing printheads and, in particular, to internally measuring the impedance of the printhead's piezoelectric actuators. Background technique [0002] Piezoelectric inkjet printheads have a number of features and failure mechanisms that can be characterized or diagnosed by measuring the impedance of the printhead's piezoelectric actuator within a frequency sweep. For example, impedance measurements of the piezoelectric actuators of a printhead can reveal issues with electrical connectivity, mechanical and fluid resonances of individual inkjets, and crosstalk with adjacent inkjets of the printhead. [0003] Traditionally, inkjet impedance sweep measurements are made using a commercial impedance meter wired to one nozzle at a time, and impedance is performed on all inkjet nozzles of the printhead due to the time constraints of continually rewiring the impedance meter to each nozzle. Scanning measurements are not possibl...

Claims

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Application Information

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IPC IPC(8): B41J2/14
CPCB41J2/14201B41J2/04581B41J2/04555B41J2/04541B41J2/0451B41J2/04533B41J2/0455
Inventor D·L·尼里姆
Owner XEROX CORP
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