Solder bridge inspection manner and its device null of lead/read

摘要

PURPOSE:To decide whether or not there is a solder bridge by setting window at positions between leads for respective images of the component, and finding the spatial differential value of brightness in the lengthwise direction of the leads as to respective images in the windows. CONSTITUTION:A controller 12 operates a lighting device 11 to light the component 11 to be inspected uniformly and an image pickup device 2 is put in operation to pick up the image of reflected light from the component 1. The image of the component 1 which is obtained by the device 2 is supplied to the device 12, which sets the window at the position between respective leads of the image; while the respective windows are scanned in the lengthwise direction of the leads in picture element units, the mean value of the brightness in each window is found at each scanning position and the difference value between the mean value of brightness at a last scanning position and the mean value of brightness at a current scanning position is found as a spatial differential value. Then the difference value of brightness is compared with a specific threshold value to check whether or not the difference value of brightness exceeds the threshold value, thereby deciding whether or not there is a solder bridge.