Patent ID: 8496758
Filing Date: 2013-07-30
Classification: B08B,H01L

Abstract:
1. A cleaning method for a wafer, comprising: contacting a front surface of the wafer with a straight-shaped front surface cleaning brush, the front surface cleaning brush rotating with a first shaft being an axis, and contacting a rear surface of the wafer with a straight-shaped rear surface cleaning brush, the rear surface cleaning brush rotating with a second shaft being an axis; and applying a first pressure on the front surface cleaning brush from both ends to enlarge the diameters in both end portions of the front surface cleaning brush, and applying a second pressure on the rear surface cleaning brush from both ends to enlarge the diameters in both end portions of the rear surface cleaning brush, the first pressure applied on the front surface cleaning brush being a pressure applied parallel to the first shaft, and the second pressure applied on the rear surface cleaning brush being a pressure applied parallel to the second shaft, wherein an inner surface of the front surface cleaning brush is directly in contact with a surface of the first shaft, wherein the front surface cleaning brush is composed of at least one single structure made of synthetic resin in a radial direction, wherein the first pressure applied on the front surface cleaning brush and the second pressure applied on the rear surface cleaning brush are adjusted based on a direction of a warp of the wafer, wherein the second pressure applied on the rear surface cleaning brush is smaller than the first pressure applied on the front surface cleaning brush in a case where the wafer is warped as convexed toward the front surface side, and wherein the first pressure applied on the front surface cleaning brush is smaller than the second pressure applied on the rear surface cleaning brush in a case where the wafer is warped as convexed toward the rear surface side.