Patent ID: 7413501
Filing Date: 2008-08-19
Classification: B24B

Abstract:
1. A method for grinding a wafer to form a concave on a rear surface thereof, the wafer having on its front surface a device region defining a plurality of devices therein and an outer excess region surrounding the device region, by employing a grinding apparatus including a chuck table for holding the wafer rotatably and a grinder having a rotatable grindstone, the method comprising: disposing an unevenness absorbing pad between the chuck table and the device region of the wafer for absorbing unevenness of the device region, and causing the wafer held by the chuck table to be rotated and ground, while keeping the grindstone in contact with the rear surface of the wafer at a center of rotation of the wafer, and while keeping the grindstone out of contact with a portion of the rear surface opposite from the outer excess region, thereby forming a concavity in a portion of the rear surface of the wafer opposite from the device region, and forming an annular reinforcing portion including the portion of the rear surface opposite from the outer excess region and around the concavity.