Patent ID: 7048173

Claim:
A wave soldering apparatus using lead-free solder, for wave soldering a substrate, with component parts mounted thereon from the upper side, by using lead-free solder, in a chamber having an inert gas atmosphere, the chamber comprising: conveying means for conveying said substrate from an inlet to an outlet of said chamber; a preheating portion for preheating the lower side of said substrate conveyed in through said inlet of said chamber by said conveying means; a wave soldering portion for wave soldering said lower side of said substrate preheated at said preheating portion and conveyed by said conveying means, by contact with a molten lead-free solder blowout; a cooling portion including a blowing portion for introducing an inert gas atmosphere in said chamber to said lower side of said substrate wave-soldered with said lead-free solder at said wave soldering portion and conveyed by said conveying means, said preheating portion, said wave soldering portion, and said cooling portion being provided in said chamber; and wherein the substrate is mounted on a conveying holder for conveyance by the conveying means, the conveying holder being configured to restrain air flowing into the chamber when the conveying holder is positioned at either of the inlet or the outlet of the chamber.