Patent ID: 6333857
Filing Date: 2001-12-25
Classification: H01L,H05K

Abstract:
A printed wiring board comprising a core substrate having at least one insulating resin layer laminated on each of front and back surfaces of the core substrate, and a wiring layer formed at least between one of (i) the core substrate and the at least one insulating resin layer and (ii), wherein said at least one insulating resin layer comprises a plurality of insulating resin layers, the insulating resin layers, the core substrate comprising:a plurality of composite dielectric layers each containing resin and a high-permittivity powder and including an uppermost composite layer and a lowermost composite layer;a plurality of metal layers stacked alternately with the composite dielectric layers such that the metal layers are disposed between the composite dielectric layers as well as on a lower surface of the lowermost composite dielectric layer and on an upper surface of the uppermost composite dielectric layer, so as to sandwich the composite dielectric layers between the metal layers to thereby form a laminated capacitor; anda plurality of through-hole conductors each of which is formed in a though-hole penetrating the plurality of composite dielectric layers and the plurality of metal layers and each of which extends between front and back surfaces of the core substrate, the through-hole conductors including a plurality of first through-hole conductors directly connected to first interior metal layers which comprise first alternate interior metal layers formed between the composite dielectric layers; a plurality of second through-hole conductors directly connected to second interior metal layers which comprise second alternate interior metal layers different from said first alternate interior metal layers; and a plurality of third through-hole conductors unconnected to any of the interior metal layers.