ERROR DETERMINATION METHOD

PROBLEM TO BE SOLVED: To provide an error determination device which does not need to prepare a verification pattern of a pseudo error, and can determine the non-existence of an error.SOLUTION: An error determination method recognizes one end P1 at which an inside circular arc 51a continues to a vertical linear line 51b, recognizes the other end P2 at which the inside circular arc 51a continues to a lateral linear line 51c, and recognizes a center point P3 of the inside circular arc 51a. The method recognizes one end P4 at which an outside circular arc 52a continues to the vertical linear line 52b, recognizes the other end P5 at which the outside circuit arc 52a continues to the lateral linear line 52c, and recognizes a center point P6 of the outside circuit arc. When displacement between the center point P3 of the inside circuit arc 51a and the center point P6 of the outside circular arc 52a is within a prescribed allowance, the method also determines that an error does not exist in a pattern which includes the inside circuit arc 51a and the outside circular arc 52a.SELECTED DRAWING: Figure 2 【課題】疑似エラーの検証用パターンを用意する必要がなく、エラー無しを判定できるようにしたエラー判定方法を提供する。【解決手段】内側円弧５１ａが縦直線５１ｂに連続する一端Ｐ１を認識するとともに内側円弧５１ａが横直線５１ｃに連続する他端Ｐ２を認識して内側円弧５１ａの中心点Ｐ３を認識する。外側円弧５２ａが縦直線５２ｂに連続する一端Ｐ４を認識するとともに外側円弧５２ａが横直線５２ｃに連続する他端Ｐ５を認識して外側円弧の中心点Ｐ６を認識する。内側円弧５１ａの中心点Ｐ３と外側円弧５２ａの中心点Ｐ６のズレが所定の許容値以内であるとき、内側円弧５１ａと外側円弧５２ａを含むパターンはエラー無しと判定する。【選択図】図２