| 摘要 |
PROBLEM TO BE SOLVED: To provide an inspection method for a solder joint structure having high joint strength obtained by solder joint that can easily distinguish good solder joint status from the bad status, and its solder joint structure. SOLUTION: As for the inspection method for solder joint structure of this invention, the deposit status of solder portion 5 covers the whole primary land portion 2a in the case where the melting of solder is in a perfect condition, while the deposit status of the solder portion 5 covers the whole secondary land portion 4b in the case where the melting of solder is insufficient and in a bad condition. The difference between the above cases in the deposit status of the solder portion 5 is large, and the distinction can be made easily. As the area of the primary land portion 2a has been made large, solder joint having high joint strength can be obtained. COPYRIGHT: (C)2008,JPO&INPIT |
