| 摘要 |
PURPOSE:To enhance conductivity and to improve flexing resistance by forming a circuit pattern of rolled and annealed copper foil made of special copper alloy, and forming an electromagnetic wave shield layer, a jumper circuit, and a through-hole circuit of special conductive paint. CONSTITUTION:Copper alloy contains 0.01-0.05wt.% of Zr, 0.01-0.05wt.% of Cr, and the residue substantially of Cu. Conductive paint (a) includes copper particles coated with titanate, zirconate, or their mixture, resol type phenol resin, chelate layer forming agent, adhesive property improving agent, conductivity improving agent, etc. Conductive paint (b) includes similar copper particles, resol type phenol resin satisfying the relation in infrared transmitivity between substituents, amino compound, and chelate layer forming agent. Electromagnetic wave shield layer 7 or the layer 7 and a jumper circuit 6 are formed of the paint (a), and the circuit 6 and through-hole circuits 5a, 5b or the circuits 5a, 5b are formed of the paint (b). |
