Patent ID: 11929256
Assignee: DISCO CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 0:
1. A wafer processing method for processing a wafer having a chamfered portion formed at a periphery thereof, comprising:
a tape attaching step of attaching a protective tape to a front surface of the wafer and making a diameter of the protective tape coincide with a diameter of the wafer;
a holding step of holding the wafer through the protective tape by a holding table such that a back surface of the wafer is exposed;
a grinding step of grinding the back surface of the wafer held by the holding table with use of grinding stones so as to thin the wafer to a thickness thinner than half of an original thickness, to reduce the diameter of the wafer, and to form a protruding portion where the protective tape protrudes from the wafer; and
a contracting step of heating and contracting the protruding portion of the protective tape after the grinding step is carried out while the wafer is not attached to a dicing tape.