Patent ID: 7564695
Filing Date: 2009-07-21
Classification: H05K

Abstract:
1. A printed wiring board, comprising: a GND layer; an insulating layer; and a signal wiring layer adjacent to the GND layer via the insulating layer, the signal wiring layer having at least two groups of differential signal lines disposed in parallel, for interconnecting a first region and a second region of the printed wiring board, wherein two lines which constitute one group of the groups of differential signal lines are reduced in width at equal rates from the first region toward the second region, and a spacing between the two lines is constant, wherein another group of the groups of differential signal lines is disposed adjacent the one group of differential signal lines, two lines which constitute the another group of differential signal lines are increased in width at equal rates from the first region toward the second region, and a spacing between the two lines is constant, and wherein the GND layer has a first slit which is formed below the one group of differential signal lines and is reduced in opening width from the first region toward the second region, and a second slit which is formed below the another group of differential signal lines and is increased in opening width from the first region to the second region.