Patent ID: 8987122
Filing Date: 2015-03-24
Classification: B24B,H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: a wafer grinding step of, using a revolving grinding stone, forming a thinned portion in a wafer and simultaneously forming a slope surrounding said thinned portion, wherein during said formation of said slope, said grinding stone is positioned so that there is always a space between said slope and a side of said grinding stone facing said slope, wherein said thinned portion is thinner than a peripheral portion of said wafer, wherein said slope extends along and defines an inner circumferential side of said peripheral portion and forms an angle of 75° or more but less than 90° with respect to a main surface of said wafer, and wherein a variation of thickness of said thinned portion of said wafer is at or about a constant value for any of said angles of 75° or more but less than 90°; and a step of forming a semiconductor device on said thinned portion.