Metal wiring bonding structure and production method therefor

A production method for a metal wiring bonding structure, including the steps of;

• (a) a step of preparing:
• a first member having a plurality of first metal wires between a first support layer formed of resin and a first covering layer formed of resin, first contacts serving as end portions of the first metal wires and exposed from the first covering layer, and first contact opposed lands formed of metal and disposed at positions respectively opposed to the plurality of first contacts on a surface of the first support layer opposite from a surface on which the first metal wires are provided, and
• a second member having a plurality of second contacts on a surface of a second support layer formed of resin, the second contacts respectively including extended surfaces opposed to imaginary extended portions imaginarily extended ahead from the first contacts in addition to base surfaces opposed to the first contacts when the second contacts are opposed to the first contacts,
• (b) a step of placing the first member on the second member and aligning the first member and the second member so that the first contacts are opposed to the base surfaces of the second contacts by utilizing the first contact opposed lands and the extended surfaces of the second contacts,
• (c) a step of heating and melting a brazing and soldering material in contact with the first contact opposed lands, supplying the melted brazing and soldering material from the first contact opposed lands to a bonding space between the first contacts and the second contacts through a distal end surface of the first member and the extended surfaces of the second contacts, and in case the first contacts and the second contacts are temporarily bonded with a preliminary brazing and soldering material beforehand, melting the preliminary brazing and soldering material by heat transfer;
• and
• (d) a step of hardening the entire brazing and soldering material.