CURVED CRACK-FORMING METHOD OF BRITTLE MATERIAL SUBSTRATE, AND BRITTLE MATERIAL SUBSTRATE

摘要

PROBLEM TO BE SOLVED: To provide a method of forming a crack along a curved possible dividing line.

SOLUTION: Covering means ML and MR mounted on the surface of the substrate have a band-like opening area R whose central line coincides with the possible dividing line CL, and shield the surface of the substrate other than the opening area so that a heat spot does not pass the same area when the heat spot HS is relatively moved along the possible dividing line. The heat spot HS having a wider width than the lateral width Wo of the opening area is relatively moved along the possible dividing line CL to cover a part of the opening area.

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