| 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 0.02-3wt.% of at least one of Fe and Mg, 0.005-1wt.% of at least one of P and B and 0.01=0.5wt.% of In, and the residue substantially of copper. Conductive paint (a) includes titanate-coated or zirconate-coated copper particles, resol type phenol resin, chelate layer forming agent, adhesive property improving agent, and conductivity improving agent. The conductive paint (b) contains resol type phenol resin and chelate layer forming agent, etc., for satisfying relationship between the above-described metallic copper powder and infrared ray permeabilities of substituent groups. Electromagnetic wave shield layer 7 or/and a jumper circuit 6 are formed of the paint (a), and the circuit 6 and/or through-hole circuits are formed of the paint (b). |
