Patent ID: 9662764
Date: 2017-05-30
CPC Classifications: B24B

Claim:
1. A substrate holder, comprising: a top ring body configured to hold a flexible membrane for pressing a substrate against a polishing surface; an inner retaining ring configured to be vertically movable independently of said top ring body and arranged around said flexible membrane; an inner pressing mechanism configured to press said inner retaining ring against the polishing surface; an outer retaining ring arranged radially outwardly of said inner retaining ring and configured to vertically movable independently of said inner retaining ring and said top ring body; an outer pressing mechanism configured to press said outer retaining ring against the polishing surface; and a supporting mechanism configured to receive a lateral force applied to said inner retaining ring from the substrate during polishing of the substrate, and supporting mechanism being coupled to said outer retaining ring and supporting said outer retaining ring tiltably with respect to said inner retaining ring.