Patent ID: 6468582
Filing Date: 2002-10-22
Classification: B23K,H05K

Abstract:
A solder pre-coating method comprising:providing a circuit board having on its surface a plurality of electrodes, the electrodes having on their surfaces a gold film, said gold film having on its surface an oxide layer of metals included during a gold plating process; covering the surface of said circuit board with a template having an opening or openings corresponding to some but not all of said plurality of electrodes; dry etching a surface of a gold film on an electrode or electrodes that correspond to the opening or openings in said template to remove said oxide layer of metals on the gold film; removing said template; imparting tackiness to a surface of non-cleaned electrode or electrodes by means of a chemical reaction between the surface of the electrode or electrodes and a tackiness imparting compound; attaching solder powder on the surface of the electrode or electrodes having tackiness imparted thereto; and forming a solder pre-coat layer on the surface of the electrode or electrodes by melting said solder powder by heating.