Patent ID: 6929169

Claim:
A method for soldering an electronic component, the method comprising: (a) forming a first solder land, which is a patterned conductor, containing copper and a second solder land, the first solder land and the second solder land being formed on the same surface of a circuit board; (b) forming a first solder section on each of the first solder land and the second solder land, the first solder section comprising a Sn—Ag—Cu solder material; (c) mounting a terminal of an electronic component chip on the first solder land; (d) heating the first solder land and the terminal to connect each other by fusion bonding; (e) forming a second solder section on the first solder section disposed on the second solder land, the second solder section comprising a Sn—Zn solder material; (f) inserting a lead terminal of another electronic component into a terminal hole formed near the second solder land; and (g) heating the second solder section and the lead terminal at a temperature lower than a temperature in step (d) so as to connect the lead terminal to the second solder section by fusion bonding.