Printhead IC with open actuator test

Details Printhead IC with open actuator test Printhead IC with open actuator test

2011-05-24

2011-05-24

Luu, Matthew (Department: 2861)

Incremental printing of symbolic information

Ink jet

Controller

C347S014000, C347S067000, C347S017000

Reexamination Certificate

active

07946674

ABSTRACT:
A printhead IC comprising: an array of nozzles; an ejection actuator corresponding to each of the nozzles respectively, the ejection actuator having a resistive heater that is activated when the actuator ejects ink through the corresponding nozzle; drive circuitry for receiving print data and activating the actuators with drive signals in accordance with the print data; and, open actuator test circuitry for selectively disabling the actuators when they receive a drive signal while comparing the resistance of the resistive heater to a predetermined threshold to assess whether the actuator is defective.

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