| 摘要 |
PURPOSE: To suppress emitting smoke or firing on fusion, and enhance the forming accuracy of a wiring part by forming a resin layer for covering the surface with the thickness of 40-200μm fluororesin. CONSTITUTION: An insulating substrate having three layer structure is manufactured by sticking a metal foil 100 and a copper foil 3, for example, on each side of a substrate material preferably comprising a fluororesin and a reinforcing material of cloth or paper. A hole 4 for connecting the edge surface is perforated in the insulating substrate, plated, and a corresponding part of an electrode 6 is formed by etching. A second copper layer 103 of the metal foil 100 exposed by etching is formed so that a plurality of current protecting element wiring parts 7 are put on both sides of the electrode 6 in series in one direction to form one arrangement and these arrangements are formed in line in parallel. A 20-400μm thickness fluororesin film 8 in which a hole is perforated in a part corresponding to the electrode is press-bonded on the surface of the substrate, and each protecting element is obtained by cutting the part of the hole 4. Since the film 8 has high flame resistance, firing of the element is prevented even if overcurrent is passed through.
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