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    • 10. 发明专利
    • MOUNTING OF LEAD COMPONENT
    • JPH0936531A
    • 1997-02-07
    • JP17909995
    • 1995-07-14
    • FURUKAWA ELECTRIC CO LTDHARIMA CHEMICALS INC
    • HIKASA KAZUTOFUKUNAGA TAKAOIRIE HISAOTANAKA HIROSHI
    • H05K3/34
    • PROBLEM TO BE SOLVED: To eliminate a defective bonding of lead components and to make it possible to mount efficiently the lead components on a circuit board by a method wherein a reflow heating treatment is performed on the board in a state that solders have a surface tension smaller than that of the solders at the time of the formation of solder precoatings to mount the lead components on the conductive parts on the board. SOLUTION: Solder precoatings are respectively formed on conductive parts 12 on a board in a state that solders have a prescribed surface tension. At this time, by setting greatly in comparison the surface tension of the solders 13 at the time of the formation of the solder precoatings, the fluidity of the solders 13 can be reduced. Then, a flux having a temporary fixture is fed on the solder precoatings and lead components 11 are respectively mounted on the solder precoatings. After that, a reflow heating treatment is performed on this board to mount the lead components 11 on the parts 12. At this time, the surface tension of the solders at the time of the reflow heating treatment is set smaller than that of the solders at the time of the formation of the solder precoatings, whereby the fluidity of the solders can be improved.