| 摘要 |
<p>A multilayer printed circuit board comprising a core substrate, multilayer wiring layers formed on the substrate by alternately laminating an interlaminar insulating layer and conductor pattern and a group of solder pads having solder bumps planarly arranged on an outermost surface of the multilayer wiring layers, characterized in that first, the solder pads located from first row to fifth row from an outer position of the solder pad group are constructed with flat pads connected to conductor patterns located on the outermost surface and having solder bumps formed on surfaces of the pads, while the solder pad group other than these solder pads are constructed with viaholes connected to a flat innerlayer pad group located in an inner layer and having solder bumps formed in recess portions of the viaholes and, second, the solder pads located from first row to fifth row from an outer position of the innerlayer pad group are constructed with flat pads connected to conductor patterns in the same layer as the innerlayer pad group, while the innerlayer pad group other than these pads are constituted with flat pads connected to a further innerlayer flat pad group located inward the above innerlayer through viaholes and, third, the layer having the structure of the above second feature is at least one layer.</p> |
