| 摘要 |
PURPOSE:To eliminate a crosstalk noise and to make possible a high-speed signal processing by a method wherein the core wires, which are used as signal conductors, of coaxial wires and the shielding layers of the coaxial wires are efficiently isolated from each other. CONSTITUTION:An adherent insulating layer 3 is formed on the surface of a circuit board 2 having a ground layer 1 and plurality of coaxial wires 4 are provided in a desired form. As the wires 4, wires 4 provided with adhesion layers for wire use, which have a superior adhesion to the layers 3 and are provided on the outermost layers of the wires 4 for an increase in the density of elements and the improvement of the workability of wiring, are used. Then, an insulating layer 11 is provided for fixing the wires 4, a laser beam is irradiated on parts, at which through holes 6 and 8 are respectively formed, to remove organic matters and shielding layers 5 of the wires 4 are exposed. As the wires 4 are used on a wiring board in such a way, no crosstalk noise is generated and a signal can be speeded up by using low-dielectric constant layers for wire insulating layers 9 of the wires 4. Moreover, a fluctuation in a dielectric impedance can be lessened by using the wires 4. |
