Patent ID: 6170936
Filing Date: 2001-01-09
Classification: B41J

Abstract:
An inkjet printhead comprising:A plurality of ink discharge nozzles served with an ink supply by respective ink flow conduits, said conduits being formed within a composite substrate;First electric heater means respective to substantially each of said nozzles to energize ink discharges from a respective nozzle;Second electric heater means for preheating ink in said conduits;First circuit means for serving operational voltage to said first heater means, said first circuit means including first voltage connector means and first ground connector means;Second circuit means for serving operational voltage to a series of electrical resistors having functional purposes substantially limited to verification of the substrate fabrication quality, said second circuit means including second voltage connector means and said first ground connector means; andThird circuit means for serving operational voltage to said second heater means, said third circuit means including third voltage connector means and said second voltage connector means whereby said second voltage connector means is electrically grounded when said printhead is operative.