METAL MASK AND LEAD-FREE SOLDER PASTE PRINTING METHOD USING IT

PROBLEM TO BE SOLVED: To realize excellent soldering by preventing the reduction of connection strength caused by the deterioration (oxidization) of a flux in a lead-free solder paste printing method using the solder including tin as the main component and silver, the solder including tin as the mai...

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Bibliographische Detailangaben
Hauptverfasser:	KOMAMIZU SHIYUUICHI, MORI TAKAYUKI, MAKINO KAZUMI
Format:	Patent
Sprache:	eng
Schlagworte:	CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY LINING MACHINES MACHINE TOOLS MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING,INKING, DAMPING, OR THE LIKE METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM PRINTED CIRCUITS PRINTING PRINTING PLATES OR FOILS SOLDERING OR UNSOLDERING STAMPS TRANSPORTING TYPEWRITERS WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To realize excellent soldering by preventing the reduction of connection strength caused by the deterioration (oxidization) of a flux in a lead-free solder paste printing method using the solder including tin as the main component and silver, the solder including tin as the main component and silver and copper or the like. SOLUTION: A circuit substrate (2) is provided with an electrode (21) for connecting the tip part of the lead member (6). Two openings (11a, 11b) are formed at the position corresponding to the position of the electrode (21) on the circuit substrate (2) to a metal mask (1). The shapes of the two openings (11a, 11b) are respectively circular or elliptical. Two lead-free solder paste patterns (30a, 30a), which are arranged in the direction of pulling out from the electrode (21) to the other circuit, are printed by using the metal mask (1). COPYRIGHT: (C)2005,JPO&NCIPI