Patent ID: 7851241
Filing Date: 2010-12-14
Classification: B28D,B65G,C03B,Y02P,Y10T

Abstract:
1. A method for severing a brittle material substrate by inscribing a scribe line on a brittle material substrate, while simultaneously forming a vertical crack extending from the scribe line in a thickness direction of the brittle material substrate, wherein the scribe line is formed with a scribe head comprising a cutter wheel with grooves formed in a blade-edge ridge thereof and a tip holder that rotatably supports the cutter wheel; and wherein the method comprises a first scribing step of pressing and rolling the cutter wheel on a protective material by moving the tip holder in a horizontal direction, in a state in which the protective material is provided on at least one substrate surface of the brittle material substrate, thereby inscribing a scribe line on the brittle material substrate, while simultaneously forming a vertical crack extending from the scribe line in a thickness direction of the brittle material substrate, and wherein rolling the cutter wheel on the protective material comprises moving the cutter wheel along a surface of the protective material by rotation without sliding.