THERMAL HEAD

PURPOSE:To provide a thermal head capable of effectively preventing a voltage drop from occurring in the longitudinal direction of a common electroconductive layer and capable of forming a sharply printed image having no irregularity in its shade on heat-sensitive paper and the like. CONSTITUTION:The thermal head is so constructed that a head substrate 1 having on its upper surface a plurality of heating resistors 2, a common electroconductive layer 4 connected commonly to the heating resistors 2 and an externally connecting terminal 5 for connecting the common electroconductive layer 4 to an external electric circuit is mounted on a heat radiating plate 7 made of metal. In this thermal head, an electrical insulating plate 9 whose substantially entire surface on the side of the head substrate 1 is covered with a reinforcing conductor 8 is interposed between the head substrate 1 and the heat radiating plate 7 in such a manner that the reinforcing conductor 8 electrically connects the common electroconductive layer 4 to the externally connecting terminal 5.