WIRING BOARD MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To prevent an insulation board having wiring conductors from being broken or cracked by an applied external force. SOLUTION: Precursor sheets 11a-11c for an insulation board are made of a thermosetting resin precursor mixed with an inorg. insulation powder. Metal paste 12 composed of a thermosetting resin precursor mixed with a Cu or Ag powder coated with a low m.p. metal of 300 deg.C or less in m.p. to form wiring conductors is printed into specified patterns on the sheets 11a-11c. The printed sheets 11a-11c are heat treated to bond the Cu or Ag powder with the low m.p. metal and thermally harden the thermosetting resin precursors of the sheets 11a-11c and paste 12.