| 摘要 |
PROBLEM TO BE SOLVED: To provide a multilayer circuit board which can effectively restrain an unnecessary electromagnetic wave radiated from a signal layer and an unnecessary electromagnetic wave which invades into the signal layer by using an economically favorable constitution, and to provide an electromagnetic wave shield method of the board. SOLUTION: In the multilayer printed circuit board 10, ground patterns 11 are arranged immediately below connector mounting parts of all layers except a layer in which the signal pattern of an external interface connector 20 passes and at peripheries of the parts immediately below the connector mounting parts. Regarding a signal layer having a signal pattern wired to the external interface connector 20 similarly to the above, the ground pattern 11 is arranged just below the connector mounting part except a part in which the signal pattern passes and at the periphery of the part immediately below the connector mounting part. By ground patterns 11, 11, ... electromagnetic shield for restraining the unnecessary electromagnetic wave radiated from the side surface of a board is performed. COPYRIGHT: (C)2005,JPO&NCIPI |
