Patent ID: 6517422
Filing Date: 2003-02-11
Classification: B24B

Abstract:
A polishing apparatus equipped with a polishing level block being rotatable and furnished with a polishing cloth for polishing semi-conductor wafers, a rotatable polishing head disposed in opposition to the polishing level block, and a polishing plate provided to the polishing head, said polishing plate being attached with a plurality of semi-conductor wafers, and a polishing operation being carried out as pressing said polishing cloth to said semiconductor wafers, comprising:a guide ring disposed at the outside of the polishing plate for pressing the polishing cloth independently of the polishing plate, a retainer ring provided at the lower end part of the guide ring for contacting to the polishing cloth, and a weight detachably mounted on the upper surface of the guide ring for adjusting pressure exerting on the polishing cloth, wherein the polishing plate is arranged inside with an inside retainer for pressing the polishing cloth.