Patent ID: 6565424
Filing Date: 2003-05-20
Classification: B24B

Abstract:
A semiconductor substrate planarization apparatus for planarization-polishing patterns while a surface of a semiconductor substrate with the patterns formed thereon being pressed onto a surface of a fixed abrasive polishing tool and relative motion occurs therebetween, comprising:means for applying fluid pressure onto a backside of the semiconductor substrate through a thin film sheet; means for holding the semiconductor substrate with an inner retainer ring for prevention of the substrate from projection; means for providing outside the inner retainer ring an outer retainer ring having a lower surface located below a lower surface of the inner retainer ring in order to keep constant the gap between the lower surface of the inner retainer ring and the surface of the fixed abrasive polishing tool; and wherein the apparatus comprises a convex mechanism for level difference correction in which a predetermined level difference is formed such that the level difference between the lower surface of the outer retainer and the lower surface of the inner retainer ring is predetermined distance, and the lower surface of the outer retainer and the lower surface of the inner retainer ring are parallel to each other.