Patent ID: 11890783
Assignee: DISCO CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B  H | IPC B  H

Claim 1:
2. The production method according to claim 1, wherein,
in the single-crystal SiC ingot, the c-axis is inclined at an off-angle relative to a normal to the end face, and an angle equal to the off-angle is formed between the c-plane and the end face, and
the cleavage layer creation step includes linearly moving the focal point of the laser beam applied to the end face, along a second direction intersecting, at right angles, a first direction that is a direction with the off-angle formed therein, so as to continuously form, along the second direction, one of the cleavage layers each of which contains the modified portion and the cracks, index-feeding the single-crystal SiC ingot and the focal point relative to each other in the first direction in a range not exceeding a width of the cracks, and then alternately repeating the linear moving and the index-feeding so as to sequentially form the multiple cleavage layers along the second direction.