| 摘要 |
Sliding motion of a cutting edge (51) is used to cause plastic deformation in a first surface (SF1) of a brittle substrate (4) and form a trench line (TL). Said trench line (TL) is formed in such a manner so as to produce a crack-free state in which, directly underneath the trench line (TL), the brittle substrate (4) is connected in a continuous fashion in a direction that intersects the trench line (TL). Said crack-free state is then maintained. Next, a crack is made to extend in the thickness direction through the brittle substrate (4) along the trench line (TL), forming a crack line (CL), and the brittle substrate (4) is split along said crack line (CL). |
