| 摘要 |
PURPOSE:To enhance printing quality by obtaining constant developed color density in a printing dot by reducing the temp. irregularity of an inclined recording surface heated by a heat generating resistor part, by forming a heat generating part for preheating to the inclined recording surface part having a printing heat generating part arranged thereto of a substrate to preheat the recording surface part, especially, the thick part of the inclined high part thereof. CONSTITUTION:Corresponding to the inclined recording surface 1b1 of a substrate 1 on the side of the back surface 1b thereof, a printing heat generating part 2A is arranged to the surface of the relatively thin part on the side of the first half part thereof and a heat generating part 3A for preheating is arranged to the surface of the relatively thick part of the side of the latter half part thereof. By this constitution, the conduction of heat from the printing heat generating part 2A to the recording surface 1b1 becomes well. Since the surface of the thick part of the recording surface 1b1 can be preheated by the heat generating part 3A for preheating, the recording surface 1b1 does not generate temp. irregularity even when corresponds to the printing heat generating part 2A in an inclined state and is almost uniformly heated. Constant developed color density can be obtained with respect to the printing dot on thermal paper without raising the heat generating temp. of the printing heat generating part 2A and the efficiency of input power can be enhanced. Further, the dimensional restriction of the substrate 1 can be relaxed to a large extent and miniaturization can be attained. |
