THERMAL HEAD

PURPOSE:To ensure that the heating value of a heat generating resistor part is greater on the higher side of an inclined recording surface, the surface temperature of the recording surface can be set substantially uniform, the shape of developed color dots on a thermal recording paper can be uniformized and printing quality can be enhanced, by setting the resistance of the heat generating resistor part to be gradually higher in the direction of increasing height of the inclined recording surface. CONSTITUTION:The rear side 1b of a substrate 1 is slantly ground so that it is sloped down toward a front edge and the thickness thereof on a heat generating part 2A is a predetermined value, thereby providing a recording surface 1b1. The heat generating part 2A is located on the front edge side of the substrate 1 at a position where the thickness of the substrate 1 is relatively small due to the presence of the inclination of the back side 1b, so that favorable heat transmission to the recording surface 1b1 is obtained. In addition, the resistance of the part 2A is set to be gradually higher toward the higher side of the inclined recording surface 1b1, so that the heating value is increased in the same direction. Therefore, though the recording surface 1b1 slantly corresponds to the heat generating part 2A, it is substantially uniformly heated, dots can be printed on a thermal recording paper with a fixed developed color density without increasing the electric power inputted to the part 2A, and power efficiency is enhanced.