| 摘要 |
In an electronic device, which is to be installed in an engine room, that comprises a circuit board, electronic elements, which are carried by the circuit board and function when electricity is applied from the circuit board to them, a case that accommodates the circuit board on which the electronic elements are disposed, and a cover that covers an opening of the case, the entire surface of a conductor pattern formed of a conductive material on the circuit board is covered with a barrier metallic film made of a metal other than the metal of the conductive material having a property of mutual diffusion with a solder material, and the barrier metallic film is further covered with a protective insulating film.
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