Abstract: A function expansion device is electrically connected to an electronic apparatus by being inserted in a socket included in the electronic apparatus and expands a function of the electronic apparatus. The function expansion device includes a substrate on which a component is mounted, a first connecting terminal that is formed at an end portion of the substrate and is electrically connected to a first signal line that connects the electronic apparatus and the component in a one-to-one fashion, a second connecting terminal that is formed at the end portion of the substrate and is electrically connected to a second signal line that connects the electronic apparatus and the component redundantly, and a protection member that is formed to cover only the second connecting terminal.

Abstract: To reduce pattern resistance including a secondary winding in a power supply module having a pair of secondary windings transformer-coupled with a primary winding. The pair of secondary windings coupled with a primary winding through a transformer is drawn out in both directions each other, and further disposed on different layers. Also, output pattern films are disposed on both sides of the second and third layers, so that pattern films of wide shape can be produced.

Abstract: A card edge connector comprises a connector body and a conductive pad, and is constructed such that the conductive pad terminates at a predetermined distance from the end of the tip portion of the connector body, and that there is further provided a protective pad, adjacent to the terminating portion of the conductive pad, which is formed at the same time with the formation of a wiring pattern in a post-fabrication step of the wiring pattern. Using the card edge connector, an electric card and an electric equipment are also provided.

Abstract: To reduce pattern resistance including a secondary winding in a power supply module having a pair of secondary windings transformer-coupled with a primary winding. The pair of secondary windings coupled with a primary winding through a transformer is drawn out in both directions each other, and further disposed on different layers. Also, output pattern films are disposed on both sides of the second and third layers, so that pattern films of wide shape can be produced.

Abstract: A card edge connector comprises a connector body and a conductive pad, and is constructed such that the conductive pad terminates at a predetermined distance from the end of the tip portion of the connector body, and that there is further provided a protective pad, adjacent to the terminating portion of the conductive pad, which is formed at the same time with the formation of a wiring pattern in a post-fabrication step of the wiring pattern. Using the card edge connector, an electric card and an electric equipment are also provided.