| 摘要 |
<p>PURPOSE:To stabilize printing quality and to reduce the number of manufacturing processes to simplify said processes, by forming a protective layer (abrasion resistant layer) before applying heat treatment thereto at the temp. higher than that generated by a heat generating resistor. CONSTITUTION:In preparing a thermal head, an abrasion resistant layer 6 being a protective layer comprising tantalum pentoxide (Ta2O5) is formed in a thickness of about 5mum by a sputtering method and heat-treated in air or a nitrogen atmosphere. This heat treatment is performed at temp. equal to or higher than a peak temp. (Tmax) generated by the pulse driving or a heat generating resistor 3 to make it possible to impart a good characteristic for reducing the change ratio in the resistance value of the heat generating resistor 3. The relation of the resistance change ratio of thus formed thermal head and a pulse number is reduced in variation and printing quality is stabilized over a long period of time and, because a heat treatment process is performed after each layer was formed by a sputtering method, there is no interruption in the process and manufacturing cost can be reduced.</p> |
