Patent ID: 6878884

Claim:
An electronic device comprising: a wiring board comprising at least one through hole; and an electronic part mounted on said wiring board, said electronic part comprising at least one lead inserted into said at least one through hole and bonded to said at least one through hole via a lead-less solder, wherein said wiring board comprises: a substrate comprising said at least one through hole; and at least one land extending on at least one surface of said substrate, said at least one land extending adjacent to an opening of said at least one through hole, wherein a projecting length of said at least one lead from said at least one surface of said substrate is not greater than one half of a horizontal size of said at least one land, where said projecting length being defined to be a length of a projecting part of said at least one lead, which projects from said at least one surface of said substrate, and wherein said lead-less solder comprises a flat fillet directly contacting an entirety of said at least one land.