Pen fault check circuit for ink jet printer

Details Pen fault check circuit for ink jet printer Pen fault check circuit for ink jet printer

2005-04-12

2009-11-10

Nguyen, Lam S (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

C347S005000, C347S009000

Reexamination Certificate

active

07614717

ABSTRACT:
A pen fault check circuit for an ink jet printer that includes a comparator that further includes a pen signal input, and a switch array coupled to the pen signal input, where the switch array includes a high voltage diode. Also, a method of checking for faults in a pen of an ink jet printer that includes the steps of generating a pen signal from a first constant current source and a pulse line resistance from a pulse line of an ink jet nozzle, generating a reference signal from a second constant current source and an external resistance from a external resistor, where the first current source and the second current source generate equal currents, and comparing the pen signal and the reference signal to determine if the ink jet nozzle is in a fault state.

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Office Action for CN Application No. 200410035042.5, mailed Apr. 25, 2008, pp. 3.

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