Method for chamfering glass substrate, glass substrate for liquid crystal panel using the method and liquid crystal panel

摘要: PROBLEM TO BE SOLVED: To provide a chamfering method by which the ridge part of cut or divided glass substrate can be worked cleanly with high productivity without necessitating washing process and impairing flatness precision on polishing plane substrate. SOLUTION: Laser beams 2 are converged condensing lens 5 emitted locally near 1, at position outside focal 3 laser beam, as beam 4 having diameter larger than that 3. With heat irradiation 4, consequentially thermal stress incident to local expansion, crack 11 is caused 1; then, successively 1 made grow continuously along relatively scanning in direction; thus, carried out separating from 1.