METHOD FOR AUTOMATICALLY DRAWING PATTERN DIAGRAM OF PRINTED WIRING BOARD

PURPOSE:To improve the working efficiency of pattern modifying and pattern checking works and to reduce wiring board designing errors and designing man-hour by setting shifting quantities of classified wiring pattern data in the X and Y directions of pattern coordinates at every layer and drawing wiring patterns of each layer on the same drawing. CONSTITUTION:Patterns are read from a hand-drawn original pattern diagram, etc., through a digitizer, etc., and the wiring pattern data on a wiring board are classified by layer based on the patterns. Then shifting quantities of the classified wiring pattern data in the X and Y directions of pattern coordinates are set at every layer and wiring patterns are drawn in accordance with the set quantities by using an automatic drawing device at every layer. The patterns 3a and 36 of the second layer of the pattern diagram of a printed wiring board having four logic layers are drawn in a state where the patterns 3a and 3b are shifted by a displaying quantity (d) from the patterns 2a and 2b of the first layer. The patterns of the third and fourth layers are also drawn in the same way. When the displacing quantity (d) is changed at every layer, the patterns can be discriminated more easily.