Patent ID: 7543263
Filing Date: 2009-06-02
Classification: H01L

Abstract:
1. An automatic trace shaping method for automatically shaping of existing traces consisting of straight and/or curved lines that are designed to be disposed in arbitrary directions on a surface of a substrate of a semiconductor package into traces each consisting of a combination of segments in directions of “45.times.n” degrees (where n is an integer) with respect to a predetermined reference line, the method comprising the steps of: setting sets of equiangular octagons each having sides parallel with said predetermined reference line for each of vias on said surface of the substrate, wherein said equiangular octagons in each of said sets are set so that they are separated from each other by at least a distance that can secure a clearance between adjacent traces and so that they are disposed coaxially about a center position of each of said vias as their common center; tentatively disposing the existing traces having segments passing between the vias that are adjacent to each other so that such segments overlap any sides of said equiangular octagons that are set for said vias which exit at positions nearest to such segments; wherein the tentative disposition process is performed sequentially for each of said existing traces so that said clearance can be secured from said existing trace for which the tentative disposition process has been completed immediately before; and correcting positions of the tentatively disposed existing traces that do not have said clearance from said other adjacent tentatively disposed existing traces so that said clearance is secured from said other adjacent tentatively disposed existing traces after the tentative disposition is completed for all of the existing traces; wherein the correction process is performed sequentially for each of said tentatively disposed existing traces in an order inverse to that in the tentative disposition process for said existing traces in said tentative disposition step.