Patent ID: 9604335
Date: 2017-03-28
CPC Classifications: B24B,H01L

Claim:
1. A substrate polishing apparatus, comprising: a substrate holder having a substrate holding surface and configured to rotate a substrate; a first polishing tool configured to press against an edge portion of the substrate to polish the edge portion, the first polishing tool having a first polishing surface which is parallel to the substrate holding surface; a first vertically-moving mechanism configured to move the first polishing tool in a vertical direction, the first vertically-moving mechanism being coupled to the first polishing tool; a second polishing tool configured to press against the edge portion of the substrate to polish the edge portion, the second polishing tool being located more inwardly than the first polishing tool with respect to a radial direction of the substrate, the second polishing tool having a second polishing surface which is parallel to the substrate holding surface; and a second vertically-moving mechanism configured to move the second polishing tool in a vertical direction, the second vertically-moving mechanism being coupled to the second polishing tool; the first polishing tool having a polishing surface more abrasive than a polishing surface of the second polishing tool; the first polishing tool, the first vertically-moving mechanism, the second polishing tool, and the second vertically-moving mechanism being located higher than the substrate holding surface.