Recorders – Performance of multiple functions of steam and gas engines – Pressure responsive element
Patent
1990-06-26
1991-12-10
Hartary, Joseph W.
Recorders
Performance of multiple functions of steam and gas engines
Pressure responsive element
324549, 346140R, B41J 205
Patent
active
050722352
ABSTRACT:
A detection circuit for detecting the existence of non-collapsing bubbles in the ink cells of a thermal inkjet printhead is connected to a heater element of an ink containing cell. The detection circuit has a sensing element of low resistance when compared to the resistance of the heater element so that printing and detecting operations can proceed simultaneously. Current in the heater element is proportional to the potential drop across the sensing element. An amplifier is used to measure the potential drop and is connected to a blocking capacitor. Non-collapsing bubbles are detected if the voltage drop across the sensing element varies from a reference level.
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Harmon et al.; Integrating the Printhead into the HP Deskjet Printer; H-P Journal, Oct. 1988, pp. 62-66.
Pond Stephen F.
Slowik John H.
Hartary Joseph W.
Xerox Corporation
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