| abstract |
In an electronic device used in an engine room environment, the present invention improves the connection life of an electronic component to a conductor wiring of a substrate and improves the corrosion resistance of the conductor wiring against corrosive gas. The purpose is to extend the useful life of electronic equipment. A circuit board, an electronic component disposed on the electronic substrate and functioning when electricity is applied from the circuit substrate, a case including a circuit board on which the electronic component is disposed, In an electronic device installed in an engine room having a cover 6 covering the open surface of the case 3, the entire surface of the conductor pattern 14 formed of a conductor member on the surface of the circuit board 11 is interdiffused with the solder member. The conductive film is covered with a metal film 17 made of a metal different from the conductive member, and further, the metal film 17 is covered with an insulating protective film 13. [Selection] Figure 1 |