Patent ID: 11958132
Assignee: DISCO CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A method of processing a SiC ingot having an end face, the method comprising:
a resistance value measuring step of measuring an electric resistance value of the end face of the SiC ingot;
a laser beam output adjusting step of adjusting output of a laser beam according to the electric resistance value measured in the resistance value measuring step;
a peeling belt forming step in which, in a case wherein a c-plane is inclined relative to the end face of the SiC ingot, an off angle is present between the end face of the SiC ingot and the c-plane, the off angle is parallel to an X-axis direction, and the X-axis direction is orthogonal to a Y-axis direction, while a laser beam of such a wavelength as to be transmitted through the SiC ingot is being applied to the SiC ingot with a focal point of the laser beam positioned at a depth corresponding to a thickness of a wafer to be formed, the SiC ingot and the focal point are put into relative processing feeding in the X-axis direction to form a belt-shaped peeling belt in which a crack extends along the c-plane from a part where SiC is separated into Si and C; and
an indexing feeding step of putting the SiC ingot and the focal point into relative indexing feeding in the Y-axis direction to juxtapose the peeling belts in the Y-axis direction.