Patent ID: 6458014
Filing Date: 2002-10-01
Classification: B24B

Abstract:
A polishing body used in a polishing apparatus comprising:a polishing head that holds an object of polishing, wherein the polishing apparatus polishes the object of polishing by causing relative motion between the polishing body and the object of polishing in a state in which a polishing agent is interposed between the polishing body and the object of polishing, wherein the polishing body comprises: at least one opening part, which allows passage of measurement light that optically measures a surface that is being polished on the object of polishing, formed in the polishing body; at least one window plate, that is transparent to at least the measurement light, positioned in the at least one opening part; and a gap between an outermost surface of the polishing body and a surface of the at least one window plate on a side of the outermost surface in an unloaded state is adjusted so that the gap is greater than an amount of compressive deformation of the polishing body that occurs when a polishing load is applied, wherein a minimum value G of the gap between the outermost surface of the polishing body and the surfaces of the at least one window plate on the side of the outermost surface is such that 10 &mgr;m