GLASS CUTTING METHOD AND ITS APPARATUS

摘要

When a scribe line is formed by applying a laser beam of ultraviolet region by one stroke, the bending strength of glass after cutting is about 50 MPa or less and the glass when used as liquid crystal panel glass may easily break inadvertently. In the method for cutting glass by irradiating a part to be cut of a glass (4) with a pulse laser beam (2) through relative movement of one stroke to form a scribe line (7) and then applying a break force to the scribe line (7), a pulse laser beam (2) of ultraviolet region is employed and the pulse laser beam (2) is applied while being moved relatively such that the total number of pulses falling on respective irradiated parts falls within a range of 2667-8000 thus forming the scribe line (7) to a depth of 1.8-6.3% of the thickness of the glass (4).