Patent ID: 7235001
Filing Date: 2007-06-26
Classification: B24B,H01L

Abstract:
1. A polishing apparatus, comprising: a polishing plate having an upper face covered with a polishing cloth; a top ring having a lower face for holding a work piece and pressing a lower face of the work piece onto the polishing cloth, said top ring being relatively moved with respect to said polishing plate so as to polish the lower face of the work piece; and a transfer unit located at a work piece transfer position, at which the work piece is transferred to said top ring, wherein said transfer unit comprises: a coil spring elastically provided between the mounting table and a base located under the mounting table, the coil spring supporting the mounting table and allowing the mounting table to move downward; a shaft downwardly extended from the mounting table and having a screw section, which is pierced through and downwardly projected from the base; a nut screwed with the screw section of the shaft; and a screw cylinder, through which the shaft is pierced, screwed with a part of the base, through which the shaft is pierced, wherein a height of the mounting table with respect to the base and an elastic force of the coil spring can be adjusted by adjusting a screwing position of the screw cylinder with respect to the base and a position of the nut, and wherein the mounting table is relatively moved close to said top ring and presses the work piece onto the lower face of the top ring so as to transfer the work piece to said top ring.