Patent ID: 6603540
Filing Date: 2003-08-05
Classification: G01N,G11B

Abstract:
A method for optically examining a series of objects that are symmetrical in reference to a rotational axis during or after a manufacturing process of the objects, comprising the steps of:providing at least some of the objects with at least one marking (16, 20, 22, 23), said marking making it possible to unequivocally determine an angular position of each object about a rotational axis (13) relative to said marking on objects manufactured in the same manufacturing process; scanning at least one section of the objects with at least one scanning element such that said marking is detectable; displaying on a display element a scanned result of geometric regions (21) in the same angular position relative to the marking with corresponding positions on other objects relative to the marking; and evaluating with an evaluation means the defects of the respective objects which have at least approximately a same position in reference to the angular position relative to the marking and a same radial distance from the rotational axis with criteria other than stochastically occurring defects.