Abstract An electrical joint using spheroidal tipped leads improves the strength of a connection regardless of the material used to bond the connections. Axial leads of a component are formed into spheroids using an appropriate heat source to melt a small portion of the lead tip. Melting a portion of the lead alloys the lead with any non-wettable solder mask rendering a wettable spheroid. Surface tension in the molten metal forms the spheroid. The spheroid increases the area to which solder or other bonding agent adheres to. Solder mask remaining on the lead decreases solder wicking further up the lead. Reduced solder wicking retains the compliance of the lead. Controlled melting of the lead maintains planarity for multileaded components.
A method of attaching a first electrical conductor having a non-wettable solder resist on a surface thereof, to a surface of a second substantially planar electrical conductor, said method comprised of the steps of: at least partially melting said first conductor and said non-wettable solder resist together in a predetermined area forming a molten spheroid on said first conductor; solidifying said first conductor and said non-wettable solder resist forming a solid wettable spheroid; and applying a bonding agent to said solid wettable spheroid and to the surface of said second substantially planar electrical conductor.
Claim 2
Independent Claim
94 words
A method of attaching a first electrical conductor having a non-wettable solder resist on a surface thereof, to a surface of a second substantially planar electrical conductor, said method comprised of the steps of: at least partially melting said first conductor and said non-wettable solder resist together in a predetermined area forming a molten spheroid on said first conductor; solidifying said first conductor and said non-wettable solder resist forming a solid wettable spheroid; and applying a bonding agent to said solid wettable spheroid and to the surface of said second substantially planar electrical conductor.