| 摘要 |
PROBLEM TO BE SOLVED: To reduce solder adhesion defects of an automatic soldering operation of a belt conveyor type. SOLUTION: The shape of a soldering part 1 on a printed wiring board 4 is made narrow as toward the downstream side of the flow of solder, and it is curved to be a tear-shaped bead shape. Thereby, as soon as the soldering part 1 is separated from a solder tank, solder which adheres in a comma-shaped bead shape is moved to the soldering part 1 as the lead leg of an electronic or electric component according to the principle of surface tension. As a result, the solder adhesion amount of the lead leg becomes much, and solder adhesion defects can be eliminated.
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