| 摘要 |
A method for cutting a strengthened glass sheet through laser irradiation. The sheet includes a front surface layer and back surface layer each having a residual compressive stress and an intermediate layer which is formed therebetween and has an internal residual tensile stress CT (MPa). A strain energy UCT (J/m2) expressed by UCT={CT2×(t1−2×DOL)}/(2×Y) is 2.5 J/m2 or more. A cutting index K (N/mm) expressed by K=Pe/v×exp(−α×t2)×(Y×αL)/(t2×&rgr;×c) is 150 N/mm or less. |
