Patent ID: 11901231
Assignee: DISCO CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B  H | IPC B  H

Claim 15:
16. A separation method of a wafer by which the wafer having a first surface, a second surface on a side opposite to the first surface, and an outer circumferential surface that is located between the first surface and the second surface and that includes a curved part curved outward in a protruding manner is separated into two wafers, the separation method comprising:
a processing step of processing the wafer to remove part of the wafer along the curved part to form a groove that extends in a straight line manner along a portion of the curved part which extends in a straight line manner;
a separation origin forming step of, after the processing step, forming the separation origin inside the wafer by positioning a focal point of a laser beam with a wavelength having transmissibility with respect to the wafer inside the wafer and executing irradiation with the laser beam while the focal point and the wafer are relatively moved in such a manner that the focal point is kept inside the wafer; and
a separation step of separating the wafer into a first wafer having the first surface and a second wafer having the second surface from the separation origin by giving an external force after the separation origin forming step.