| 摘要 |
PROBLEM TO BE SOLVED: To stably fuse it by an abnormal current, and make it nonfusible by a rush current by arranging terminal electrodes on both ends of a glass- ceramic substrate where a diamond film is formed on a surface, and laying and forming a fuse element film having a fusible extremely thin part. SOLUTION: A diamond film 2 having a thickness of 5 to 100μm and high heat capacity is laid in an area forming at least a fuse element film 3 on a surface of a glass-ceramic substrate 1. The fuse element film 3 which extends in the lengthwise direction of the substrate 1 and has a fusible extremely thin part, is also formed on a surface of the diamond film 2. Then, when a rush current and an abnormal current flow, the fuse element film 3 is heated, but this is dispersed to the highly heat conductive diamond film 2 side. Therefore, a temperature rise in the fuse element film 3 becomes gentle. That is, when the rush current and the abnormal current are generated, a heating temperature rise in the fuse element film can be delayed by high heat conductivity and high heat accumulating performance of the diamond film 2.
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