| 摘要 |
PROBLEM TO BE SOLVED: To improve adhesive properties of insulating resin and a conductor and electric reliability as a circuit board as to a both-sided/multi-layered printed wiring board which has inter-layer conduction with a conductor projection part formed on a base-side conductor. SOLUTION: Copper foil 13 is joined directly to a tip 12A of the conductor projection part 12 across no inclusion in an area where it is joined to a tip 12B of the conductor projection part 12, and in an area where a base material 11 and an insulating film 14 are stuck and an area where the copper foil 13 and insulating film 14 are stuck, anti-corrosive coatings 16 and 17 are present between them. COPYRIGHT: (C)2006,JPO&NCIPI
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