Patent ID: 8696924
Filing Date: 2014-04-15
Classification: B24B

Abstract:
1. A polishing method for polishing a substrate by pressing the substrate against a polishing surface on a rotating polishing table, the polishing method comprising: scanning the substrate with a film thickness measuring sensor disposed in the polishing table and outputting a sensor signal; generating a representative value from the sensor signal of the film thickness measuring sensor generated during a previous rotation of the polishing table; outputting a corrected signal, the corrected signal having the representative value when a value of the sensor signal of the film thickness measuring sensor generated during a current rotation of the polishing table is larger than the representative value and having the value of the sensor signal of the film thickness measuring sensor generated during the current rotation of the polishing table when the value of the sensor signal of the film thickness measuring sensor generated during the current rotation of the polishing table is smaller than the representative value; and computing a film thickness of the substrate from the outputted corrected signal.