Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1989-04-24
1991-02-26
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
219216PH, 219506, 324523, 324525, 324718, 346 76PH, 346140R, G01R 3102
Patent
active
049964879
ABSTRACT:
According to the present invention, a method and device for detecting failure of heating elements in various jets of a thermal jet printing device is provided. The printing device which includes a plurality of thermally actuated printing jets, each of which jets includes a resistance heating element, is actuated when a current is supplied to generate a bubble. The bubble expands eject a drop of ink. Electrical circuit means are provided including power supply means to supply current to the electrical resistance elements. Control means are also provided to selectively connect the elecrical resistance elements to this power supply in preselected arrays for forming bubbles in selected configuration to perform the ink jet printing. The operation includes a test circuit coupled to the resistive heater elements and operable by the control circuit to generate a failure signal representative of a resistance above a preselected value in any resistance heating elements. With means to detect the failure signal to identify the resistance heating element which has failed.
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"Integrating the Printhead into the HB Deskjet Printer", Hewlett-Packard Journal, (Oct., 1988) pp. 62-64 by J. P. Harmon and J. A. Widder.
McSparran Ray A.
Moore William S.
Wooden James R.
Eisenzopf Reinhard J.
International Business Machines - Corporation
Mueller Robert W.
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