Appeal 2007-0960
Application 10/066,529
STATEMENT OF THE CASE
Appellants invented a temperature control system for a printhead
comprising multiple ink ejection elements. Specifically, a thermal response
model and an ejection history of the printhead assembly are stored in
memory. Moreover, a controller is configured to estimate an actual
temperature of the printhead assembly based on (1) a measured or current
operating temperature of the printhead assembly; (2) the thermal response
model; and (3) the ejection history of the ejection elements.1 Claim 24 is
illustrative:
24. A printhead temperature control system, comprising:
a printhead assembly having a plurality of ejection elements;
a temperature sensor configured to generate a measured temperature
of the printhead assembly;
a memory device configured to store a thermal response model of the
printhead assembly and an ejection history of the ejection elements; and
a controller configured to estimate an actual temperature of the
printhead assembly based on the measured temperature of the printhead
assembly, the thermal response model of the printhead assembly, and the
ejection history of the ejection elements,
wherein the ejection history of the ejection elements identifies
whether the ejection elements have been fired and whether the ejection
elements have not been fired, and wherein the thermal response model of the
printhead assembly includes a first set of parameters when the ejection
elements have been fired and a second set of parameters when the ejection
elements have not been fired.
1 See generally Specification 15:2-26.
2
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