Systems and methods for controlling and testing jetting...

Details Systems and methods for controlling and testing jetting... Systems and methods for controlling and testing jetting...

2008-03-03

2010-12-28

Nguyen, Lamson D (Department: 2861)

Incremental printing of symbolic information

Ink jet

Controller

Reexamination Certificate

active

07857413

ABSTRACT:
The present invention provides systems, methods, and apparatus for monitoring and controlling a slew rate of a voltage signal provided to a PZT capacitor of a print head. The system includes a digital driver circuit adapted to generate a signal indicating a nominal slew rate, a probe circuit for measuring a firing pulse voltage signal provided to the capacitor, a comparator coupled to the digital driver and the probe circuit comparing a measured slew rate with the nominal slew rate generating a signal indicating a difference between the measured slew rate and the nominal slew rate, an analog driver circuit coupled to the comparator adapted to adjust the slew rate of the voltage signal in response to the difference signal, and an analog/digital converter adapted to sample the voltage signal output from the probe circuit and to provide an output for diagnostic purposes. Numerous other features and aspects are disclosed.

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