Patent ID: 6371589
Filing Date: 2002-04-16
Classification: B41J

Abstract:
A device for controlling an energy supplied to an integrated emission resistor of a thermal ink jet print head fitted on a printer, said emission resistor being arranged on a substrate and being capable of generating a vapour bubble upon reaching an enucleation temperature, said printer comprising means for selectively supplying an amount of said energy to said emission resistor, said print head comprising a protective layer arranged on said emission resistor, a layer of Ta arranged on said protective layer and a layer of electrically conductive material arranged on said layer of Ta, for making connections to said emission resistor, wherein the improvement comprises:a temperature sensor formed from said layer of electrically conductive material; a reference temperature sensor arranged on said substrate, at a determined distance from said temperature sensor; said temperature sensor and reference temperature sensor being provided for detecting said enucleation temperature and being arranged in correspondence with an integrated test resistor of said print head, identical in construction to said emission resistor.