Thick film die heat sensitive record hetsudo and recorder

摘要

PURPOSE:To obtain a smooth photographic printed image by uniforming distribution of tempera ture in each pixel on the surface of a thermal recording head by a method wherein a protec tive layer of a thick film type thermal head is made to be a two layer structure of an electric insulating protective layer and a thermal diffusion film. CONSTITUTION:A partial glazed layer 2 being a thermal resistant layer, an electrode 3 and further a thick film resistor 4 are successively laminated on an alumina substrate 1. Further, an insulating protective layer 5 is formed and a metallic layer 6 as a thermal diffusion film (a high thermal conductive layer) is, in a beltlike manner, formed thereon so as to be located above the thick film resistor 4. The metallic film 6 is formed as follows. Paste of adding glass particles and organic binder to 88-99 wt % of, for instance, gold, silver, or copper is printed with a screen printer, is dried, and is burnt so that a pattern width in the subscan direction becomes 50-150 % of the width of a thermal resistor. Further, a surface protective layer 7 the surface of which is smooth and which has glass having conductivity as a main component is formed as an uppermost layer to construct a thermal head. Since the metallic film 6 is high in thermal conductivity, heat is diffused in the inward direction of the surface, and heat generated in the resistor 4 is, in a uniform distribution manner, conducted to the surface of the surface protective layer 7. Then, a smooth image can be outputted.