| 摘要 |
PURPOSE:To obtain a thermal head excellent in thermal response, by printing a pasty glass powder material containing a specific amount of a finely divided glass powder and having a softening point set to a specific range on a base material before baking. CONSTITUTION:A finely divided glass powder is contained in a glass paste used in the formation of a heat accumulator 2 in an amount of at least 20% or more by wt. of the total amount of a glass powder and the softening point of these glass powders is set to 650-850 deg.C. When the glass paste is printed on a base material 1 and baked, air bubbles generated at a baking time is extremely reduced because the moisture or gaseous component adsorbed by the finely divided glass powder is extremely little and, even if said air bubbles are issued to the surface, no adverse effect is exerted on printing quality. Because the glass softening point is specified as mentioned above, air bubble generating temp. almost coincides with necessary baking temp. and control for uniformizing the pore size or distribution of air bubbles is easily performed and, as a result, a desired thermal head is obtained with good efficiency. |
