RECESSED STRUCTURE CAPABLE OF BEING CONVENIENTLY MONITORED ONLINE, AND MANUFACTURING METHOD THEREOF

摘要

A recessed structure capable of being conveniently monitored online comprises a medium layer I, and a medium layer II positioned above the medium layer I. The medium layer I comprises a metal through hole, and a metal contact layer positioned above the metal through hole. The medium layer II comprises a conical recess positioned above the metal contact layer. The conical recess has inclined sidewalls. The horizontal cross section area of the conical recess gradually increases in a direction away from the metal contact layer. A reflective film covers the inclined sidewall. The recessed structure capable of being conveniently monitored online and the manufacturing method thereof enable quick identification of defects in a recessed structure by means of alternating bright and dark annular images formed by a monitoring system.