Method of fault detection in ink jet printhead heater chips

Details Method of fault detection in ink jet printhead heater chips Method of fault detection in ink jet printhead heater chips

1996-12-17

1999-08-24

Regan, Maura

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324765, G01R 2756

Patent

active

059429003

ABSTRACT:
Method and apparatus is described for detecting faults, such as cracks, in ink jet printhead heater chips using a resistor on the heater chip. The resistor is located adjacent to at least one edge of the heater chip. One method, for example, includes the steps of measuring the resistance of the resistor at a first temperature and comparing the measured electrical resistance to a theoretical calculated resistance. Another method, for example, includes the steps of measuring the resistance at a first temperature, heating the chip, and measuring the resistance at a second temperature. Faults are detected by comparing expected changes in resistance or temperature to measured changes.

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