Patent ID: 8780153

Claim:
A thermal head for printing on thermal paper, comprising: a partial glaze layer with a cross section of a circular segment shape disposed on a flat insulating substrate to extend in a lengthwise direction thereof; a heating resistor disposed on a top portion of the partial glaze layer and extending in the lengthwise direction; and an insulating protection film covering an entire surface of the insulating substrate, including the heating resistor; and a level difference provided between the insulating protection film on the heating resistor and a flat portion of the insulating protection film over an area outside the partial glaze layer, wherein the level difference has such a size that the insulating protection film on the heating resistor is positioned at a higher level, and that a platen roller pressing thermal paper presses the thermal paper against a surface of the insulating protection film on the heating resistor and against a surface of the flat portion of the insulating protection film over the area outside the partial glaze layer at a side close to the partial glaze layer, thereby distributing a pressing force of the platen roller.