| 摘要 |
PROBLEM TO BE SOLVED: To prevent electric contact parts from being corroded, to prevent a solder from adhering to insertion holes and at the same time, to improve the mounting work for mounting components by a method wherein a carbon layer is formed on the electric contact parts. SOLUTION: A printed-wiring board 1 is a flexible printed circuit which is constituted using a board 2, which consists of a polyester material having a flexibility, as its base. Wiring parts 3 consisting of a copper foil, for example, are formed on the rear of this board 2. Electric contact parts 6 having an insertion hole 5 in the centers are provided for connecting lead wire terminals and a warning valve 10 with the wiring parts 3. In the case where the board 1 is used after being subjected to solder dip processing for connecting the lead wire terminals of other mounted components with the wiring parts 3 through the holes 5 and the parts 6, if a solder is adhered to the holes 5, a hindrance results in being constituted to the following process. Owing to that, a carbon layer 7 is formed on the surfaces of the parts 6.
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