Patent ID: 6331868
Filing Date: 2001-12-18
Classification: B41J

Abstract:
A thermal printhead comprising:an insulating substrate having an upper surface and a side surface;a heat retaining glaze layer formed on the upper surface of the substrate;a heating resistor formed on the glaze layer;a common electrode including a plurality of teeth connected to the heating resistor, and a connecting portion connecting the teeth with each other;a plurality of individual electrodes connected to the heating resistor;an electrode auxiliary layer formed on the connecting portion of the common electrode;an overcoat layer for covering the heating resistor and the electrode auxiliary layer; anda protective layer for covering the overcoat layer;wherein the connecting portion of the common electrode includes a first region formed directly on the glaze layer and a second region formed directly on the upper surface of the substrate, the electrode auxiliary layer being arranged to contact both the first and the second regions of the connecting portion.