Abstract: A surface mounting structure for a surface mounting electronic component has an electronic component, a land, a wiring, and an electrical connection pattern. The electronic component has electrodes at opposite ends thereof. The land is connected to each electrode through a solder. The wiring is connected to the land and has a width which is smaller than a width of the electronic component in a width direction thereof. The wiring is connected to the electrical connection pattern. The electrical connection pattern has on a side on which the wiring is connected to the electrical connection pattern a width which is larger than the width of the electronic component in the width direction thereof.

Abstract: A main substrate is provided with a wiring pattern on its surface and in the inner layer. A wiring pattern for connecting the signal line or power line of the main substrate to an external circuit is formed on the flexible printed circuit. A connection terminal to which a corresponding wiring pattern is connected is formed at the tip of the flexible printed circuit. A through-hole is formed between the wiring patterns. Potting resin is potted in each through-hole and around it. When the resin hardens, the potting resin joints the main substrate and the flexible printed circuit.

Abstract: A surface mounting structure for a surface mounting electronic component comprises an electronic component a land, a wiring, and an electrical connection pattern. The electronic component has electrodes at opposite ends thereof. The land is connected to each electrode through a solder. The wiring is connected to the land and has a width which is smaller than a width of the electronic component in a width direction thereof. The wiring is connected to the electrical connection pattern. The electrical connection pattern has on a side on which the wiring is connected to the electrical connection pattern a width which is larger than the width of the electronic component in the width direction thereof.

Abstract: A composite circuit board includes a first circuit board having a first land and a second circuit board having a second land at least a part of which is soldered to a part of the first land face-to-face. The first land has a region overlapped by the second circuit board. The region has a non-facing region which does not face to the second land.

Abstract: A main substrate is provided with a wiring pattern on its surface and in the inner layer. A wiring pattern for connecting the signal line or power line of the main substrate to an external circuit is formed on the flexible printed circuit. A connection terminal to which a corresponding wiring pattern is connected is formed at the tip of the flexible printed circuit. A through-hole is formed between the wiring patterns. Potting resin is potted in each through-hole and around it. When the resin hardens, the potting resin joints the main substrate and the flexible printed circuit.

Abstract: A semiconductor module has a semiconductor device, a wiring substrate, an external terminal, and a conductor. The semiconductor device includes a main electrode through which a main electric current flows. The wiring substrate includes a base plate and a main wiring pattern provided on a surface of the base plate. The main electrode of the semiconductor device is in electrical contact with the main wiring pattern. The external terminal is provided for electrically connecting an external of the wiring substrate with the main wiring pattern. The conductor extends longitudinally along a main electric current path, through which the main electric current of the semiconductor device flows, from the external terminal, or a portion adjacent to the external terminal, to the main electrode or a portion adjacent to the main electrode, while being in electrical contact with the main wiring pattern.