| 摘要 |
PROBLEM TO BE SOLVED: To provide a wiring board which prevents an electrical short circuit between signal wiring and a power supply conductor, or between power supply conductors different from each other in a clearance portion.SOLUTION: A wiring board manufacturing method comprises the steps of: forming on an insulation layer 1 or 2 in a lower layer, a power supply conductor P in a lower layer, on which a plurality of rectangular gassing opening A, 100-300 μm on each side are formed at an arrangement pitch of 300-1000 μm in a matrix shape; laminating on the insulation layer 1 or 2 in the lower layer, an insulation layer 2 in an upper layer so as to cover the power supply conductor P in the lower layer; and forming on the insulation layer 2 in the upper layer by a semi-additive method, circular via lands 9 each having a diameter of 80-150 μm and power supply conductors P in the upper layer, which are arranged to surround the via lands 9 via respective clearances C each having a width of 30-100 μm. The openings A and the clearances C are arranged not to be arranged one above the other.SELECTED DRAWING: Figure 3 |
