Patent ID: 8845391
Filing Date: 2014-09-30
Classification: B24B

Abstract:
1. A substrate polishing apparatus for polishing a substrate, said substrate polishing apparatus comprising: a rotatable polishing table on which a polishing pad is attached; at least one substrate holder configured to hold a substrate and press the substrate against a polishing surface of the polishing pad on said rotatable polishing table so as to polish the substrate; a pad-temperature detector configured to detect a temperature of the polishing surface of the polishing pad; a pad-temperature regulator configured to contact the polishing surface of the polishing pad to regulate the temperature of the polishing surface; and a temperature controller configured to control the temperature of the polishing surface of the polishing pad by controlling said pad-temperature regulator based on information on the temperature of the polishing surface detected by said pad-temperature detector, wherein said temperature controller is configured to select a proportional integral derivative (PID) parameter from several kinds of PID parameters based on a difference between a set temperature and the detected temperature of the polishing surface of the polishing pad and to control the temperature of the polishing surface of the polishing pad using the selected PID parameter based on the information on the temperature of the polishing surface.