Electrical product manufacturing method

A method for manufacturing an electrical product by assembling a molded body and a flexible sheet:

• wherein the molded body is made of a thermoplastic resin having a melting point equal to or less than 300° C.;
• wherein the flexible sheet is made of a resin better in heat-resisting property than the resin composing the molded body;
• wherein the molded body is provided with at least wiring having a predetermined pattern and a connection terminal having a width a2 wider than a width al of the wiring;
• wherein the flexible sheet includes at least wiring having a predetermined pattern and a connection terminal having a width b2 wider than a width b1 of the wiring;
• wherein the molded body has
• a thickness of 0.5-2 mm,
• a width a1 of the wiring of 5-100 μm,
• a width a2 of the connection terminal of 100-500 μm, and
• a relationship:
• a2>a1;
• and
• wherein the flexible sheet has
• a thickness of 25-300 μm,
• a width b1 of the wiring of 50-100 μm, and
• a width b2 of the connection terminal of 150-500 μm,
• wherein the method comprises:
• arranging the connection terminal of the molded body and the connection terminal of the flexible sheet such that the connection terminals face each other, and
• an electromagnetic induction heating performing electromagnetic induction heating after the arranging, and
• wherein solder provided between the connection terminal of the molded body and the connection terminal of the flexible sheet is molten by the electromagnetic induction heating, and the connection terminal of the molded body and the connection terminal of the flexible sheet are joined together.