Patent ID: 9149903
Filing Date: 2015-10-06
Classification: B24B,H01L

Abstract:
1. A polishing apparatus for polishing a substrate, the polishing apparatus comprising: a polishing table having a polishing surface; a substrate holding apparatus configured to hold the substrate and to press the substrate against said polishing surface; and a controller, wherein said substrate holding apparatus comprises: wherein said first passage is connected to a pressure regulating mechanism configured to regulate a pressure of a pressurized fluid to be supplied to said pressure chamber, a vacuum source configured to produce a vacuum in said pressure chamber, and a gas source configured to supply a dry gas to said pressure chamber, wherein said first passage is connected to said pressure regulating mechanism through a first valve, said vacuum source through a second valve, and said gas source through a third valve, wherein said controller performs control to close said first valve and said third valve and to open said second valve so that the vacuum is produced in said pressure chamber to hold the substrate under vacuum, when said substrate holding apparatus holds the substrate, and wherein said controller performs control to close said first valve and said second valve and open said third valve so that said first passage is connected only to said gas source and said pressure chamber, when the substrate starts to be polished or is removed from said substrate holding apparatus.