Patent ID: 6429887
Filing Date: 2002-08-06
Classification: B41J

Abstract:
A thermal printhead comprising: an elongated rectangular substrate including an attaching surface and a non-attaching surface, and a heat sink plate attached to the attaching surface of the substrate, the non-attaching surface of the substrate being provided with a common electrode, a plurality of individual electrodes, a heating resistor extending longitudinally of the substrate in conduction with the common electrode and the individual electrodes, an insulating protective layer and an opaque conductive protective layer for covering the heating resistor,wherein the thermal printhead further includes a positioning indicia which serves as a reference for positioning the substrate relative to the heat sink plate, wherein the positioning indicia includes a first positioning reference portion extending longitudinally of the substrate and a second positioning reference portion extending widthwise of the substrate, and wherein one of the first and the second positioning reference portions is formed of the same material as that of the heating resistor, whereas the other one of the first and the second positioning reference portions is formed of the same material as that of the common electrode and the individual electrodes.