Appearance inspection method for flat wire enameled wire and appearance inspection apparatus for flat angle enameled wire

摘要

PROBLEM TO BE SOLVED: To provide an appearance inspection method of flat enameled wire and a visual inspection apparatus of flat enameled wire capable of accurately detecting defects on the surface of a flat enameled wire.SOLUTION: The visual inspection apparatus picks up a bright field image of a flat surface and an angle face while irradiating the flat surface and the angle face of the flat enameled wire moving in a longitudinal direction with a bright-field imaging beam. The visual inspection apparatus also picks up a dark field image of the flat surface and the angle face while irradiating the flat enameled wire with a dark-field imaging beam along the longitudinal direction. The visual inspection apparatus determines existence/absence of defects on the flat surface and the angle face based on the bright field image and the dark field image.SELECTED DRAWING: Figure 2