Patent ID: 9572251
Date: 2017-02-14
CPC Classifications: H05K

Claim:
1. A printed circuit board comprising: a plurality of laminated substrates each comprising a plurality of layers and a fiberglass cloth contained in its resin and with a wiring arranged onto at least one of its surfaces, wherein at least one substrate of the plurality of substrates is provided with a wiring for transmitting a higher speed signal than that transmitted by wirings arranged onto the other of the plurality of substrates, and the at least one substrate comprises a fiberglass cloth made of a different material from that included in the other of the plurality of substrates, wherein said fiberglass cloth contained in said at least one substrate provided with the wiring for transmitting the higher speed signal has a lower dielectric constant than that of fiberglass cloths included in the other of the plurality of substrates, wherein a material of resin used for said at least one substrate provided with the wiring for transmitting the higher speed signal and the other of the plurality of substrates are the same, and wherein in each of said substrate provided with the wiring for transmitting the higher speed signal and the other substrates is included more than one layer.