Patent ID: 7715616
Filing Date: 2010-05-11
Classification: H05K

Abstract:
1. A method of setting an inspection logic for inspecting a PC board, the inspection logic including a color condition for specifying a color appearing in body of a component to be inspected and a determination condition, the method comprising: a step of specifying a part of the component body and a part adjacent to the component body by an image process from a captured image of an IC component mounted in a normal position; a step of obtaining frequency distributions of values of one or plural color characteristic amounts in a plurality of target points and exclusion points, the target points being pixels in the component body and the exclusion points being pixels in a part adjacent to the component body; a step of obtaining a range of values of color characteristic amounts, that ideally separates the values of the characteristic amounts in the target points from the values of the characteristic amounts in the exclusion points on the basis of the frequency distributions of the values of the one or plural color characteristic amounts; a step of setting, as the color condition, the kind(s) of the one or plural color characteristic amounts and the range of values of the color characteristic amounts; a step of extracting a pixel area satisfying the color condition from each of a plurality of images of an acceptable IC component mounted in a normal position and a plurality of images of a defective IC component which is deviated; a step of specifying an edge of each pixel area by an image process; a step of obtaining a frequency distribution of values of the characteristic amount of the edge; a step of obtaining a range of values of characteristic amounts which ideally separate values of characteristic amounts of an edge of a pixel area extracted from the image of the acceptable IC component from values of characteristic amounts of an edge of a pixel area extracted from the image of the defective IC component on the basis of the frequency distribution of values of the characteristic amounts; and a step of setting, as the determination condition, the kind of the characteristic amount and the range of values of the characteristic amount.