METHOD FOR SCRIBING SUBSTRATE OF FRAGILE MATERIAL

摘要

Provided is a scribing method, wherein abnormal destruction or generation of burs due to poor cutting phenomenon do not tend to occur. A scribing method of a substrate (10) of fragile material comprises forming, in the surface of the substrate, an outline scribe line consisting of a closed curve constituting the outline of a product to be cut out, and forming an auxiliary scribe line for assisting division on the outside of the outline scribe line, wherein auxiliary scribe lines (12a-12d, 13a-13d) are directed in the tangential direction of outline scribe lines (11a-11c) and a non-scribe region having a distance of 2 mm or less is left between the auxiliary scribe line and the outline scribe line.