| 摘要 |
A cutter edge (51) is caused to slide to generate a plastic deformation on a first surface (SF1) of a brittle substrate (4), thus forming a trench line (TL). The trench line (TL) is formed so as to obtain a crack-free state in which the brittle substrate (4) seamlessly continues in a direction intersecting the trench line (TL) directly below the trench line (TL). The crack-free state is then maintained. A crack of the brittle substrate (4) in its thickness direction is extended along the trench line (TL) to form a crack line (CL). The brittle substrate (4) is divided along the crack line (CL). |
