Patent ID: 7251801
Filing Date: 2007-07-31
Classification: G06F,H05K

Abstract:
1. A method of designing a circuit board, comprising: setting, with respect to a circuit board, a mounting position of an electronic device, positions of pads to which terminals of the electronic device are connected, and positions of external connection terminals; forming a rats nest by connecting said pads and external connection terminals by straight lines; extracting a region with the highest density of lines of the rats nest; setting design rules relating to routes and dimensions of conductor lines in the region with the highest density of lines of the rats nest; laying the conductor lines at the region with the highest density of lines of the rats nest; confirming whether or not the conductor lines can be laid at the region with the highest density of lines of the rats nest; repeating setting of the design rules and laying of the conductor lines if the conductor lines cannot be laid, and laying the conductor lines of the remaining regions by the set design rules if the conductor lines can be laid.