| 摘要 |
PROBLEM TO BE SOLVED: To enhance dividing performance through formation of a highly accurate dividing groove while eliminating machining of each unit by providing a glaze layer on a ceramic substrate and employing a multistage inclining inner wall face or a curved inner wall face in the profile of a groove for dividing the ceramic substrate into a plurality of sections. SOLUTION: A glaze layer 20 is provided partially on a ceramic substrate 10 and a dividing groove 11 is made in the same surface as the glaze layer 20 while a dividing groove 12 is made in the rear surface thus forming a glaze substrate for thermal head. Subsequently, a conductive pattern of heating element, for example, and a protective film, and the like, are formed on the glaze layer 20 and divided by dividing grooves 11, 12 to produce a unit body, where a glaze layer is provided on a ceramic body, which can be employed as a thermal head. The dividing groove 11 made in the same surface as the glaze layer 20 is provided with a central deep groove 11a having a small open angleθ0 and an inclining face 11b having a large open angleθ1 at the opposite ends thereof and a multistage inclining inner wall face is provided as a whole.
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