| 摘要 |
Any defect of a board fabricated via a drawing process executed by a drawing device attributed to Gerber data is prevented. Gerber data of vector form representing a wiring pattern drawn directly on a board is loaded before it is expanded into drawing raster data by a RIP processing (100). Thresholds for check are set corresponding to the resolution of the drawing and the type of the photosensitive material on the board (102, 104). Check for presence/absence of any arc portion the circumference length of which is below a threshold th1, presence/absence of any arc portion the radius difference of which is equal to or greater than a threshold th2, presence/absence of any pin-hole region the area of which is equal to or greater than a threshold th5, presence/absence of any pattern the width of the portion overlapping with an adjacent pattern of which is below a threshold th6, and presence/absence of any pattern the gap with adjacent patterns of which is below a threshold th7 is performed (106 to 176). If an error is detected, a Gerber error file for designating an error position is generated and the error position is displayed on a display (182, 184).
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