Patent ID: 11969856
Assignee: SUMCO CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B  H | IPC B  H

Claim 0:
1. A manufacturing method of a wafer comprising a notch, the method comprising:
mirror-polishing a notch chamfered portion of the notch in a manner such that polishing progresses while a polishing pad extends over a first principal surface and a second principal surface of the wafer;
polishing the first and second principal surfaces of the wafer;
mirror-polishing an outer-periphery chamfered portion of an outer periphery of the wafer; and
finish-polishing the first principal surface of the wafer, wherein
the finish-polishing is performed after performing the mirror-polishing of the notch chamfered portion, the polishing of the first and second principal surfaces, and the mirror-polishing of the outer periphery chamfered portion in this order.