Patent ID: 8702477

Claim:
A polishing pad sub plate comprising a polishing pad fixed to a polishing pad support surface configured, by equipping the upper surface of a polisher rotation table with a sub plate main body, together with creating a polishing pad support surface to which a polishing pad for polishing semiconductor wafers is stacked, aligned and fixed by means of a central portion of surface of said sub plate main body, and by fashioning a fitting ring to an outer edge of the said sub plate main body, mated to the external circumference of the rotation table, and protruding in the downward direction guided by the external circumferential surface of said polisher rotation table, it is possible for the said polishing pad to be detached from the rotation table, it possesses an adhesive layer spread on the upper surface of said rotation table on which said sub plate main body is superimposed, improving the adhesion of the surface superimposed on said sub plate main body which is placed on top of said rotation table, having an air removal channel connecting the internal space between the said rotation table and the said sub plate main body with the outside air and the said sub plate main body is supplied on its back surface with a cushion layer, and the said cushion layer is superimposed upon the top of the said rotation table.