Patent ID: 7214122
Filing Date: 2007-05-08
Classification: B24B,H01L

Abstract:
1. A substrate polishing apparatus comprising: a polishing table; a polishing pad mounted on said polishing table for polishing a semiconductor substrate, said polishing pad having a through hole formed therein; a light emission and reception device having an emitter for emitting measurement light through said through hole formed in said polishing pad to the semiconductor substrate and a receiver for receiving reflected light from the semiconductor substrate so as to measure a film on the semiconductor substrate, said light emission and reception device being disposed in said polishing table; a supply passage for supplying a fluid to a path of the measurement light so as to produce a flow of the fluid from said light emission and reception device to the semiconductor substrate; a discharge passage for discharging the fluid in the path of the measurement light, said discharge passage being provided in said polishing table and having a fluid connection with said supply passage; and a protection cover mounted on said polishing table and fitted into said through hole for positioning a new polishing pad when said new polishing pad is attached to said polishing table, wherein said supply passage has an outlet portion, and a portion of said emitter and a portion of said receiver are located within said outlet portion.