Patent ID: 7975588

Claim:
A scribing method comprising: providing a brittle material separation scribing wheel having a central portion in a thickness direction protruding in a circumferential direction so as to form a blade edge having a predetermined non-zero blade edge angle at an edge line portion of the wheel, wherein the edge line portion of the scribing wheel comprises at least one region (A) and at least one region (B), region (A) is a region where a plurality of grooves having a predetermined shape are formed in the edge line portion with a predetermined pitch, while region (B) is a region where grooves are not formed in the edge line portion, and in the brittle material separation disk-shaped wheel the ratio of a length of a region occupied by the plurality of grooves with respect to an entire perimeter of the edge line portion is equal to or smaller than 3/4, and performing scribing on a brittle material substrate by applying a force to the scribing wheel to form a scribe line and a vertical crack in the brittle material substrate along the scribe line, the vertical crack being formed along the vertical direction of the scribe line on the brittle material substrate.