| 摘要 |
<p>PURPOSE:To provide a circuit board where a wiring conductor and a circuit conductor are clad firmly and the wiring conductor and the circuit conductor are electrically, positively, and properly connected. CONSTITUTION:In the title circuit board where a circuit conductor 4 consisting of copper is clad on the outer surface of an insulation substrate 1 in that a wiring conductor 2 consisting of at least one type out of tungsten, molybdenum, and manganese is provided so that one part of the circuit conductor 4 contacts the wiring conductor 2, a plating layer 3 consisting of copper is included at the contact part between the wiring conductor 2 and the circuit conductor 4 and at the same time the surface roughness of the wiring conductor 2 where the plating layer 3 contacts is set to 0.7-1.0mum (center line average roughness (Ra)) and 4.0-8.0mum (maximum height (Rmax)).</p> |
