| 摘要 |
[Solution] Provided is plate glass (10) that has a side surface (12) cut by melting the glass with laser light. At a minimum, the edge (14) where said laser-cut side surface (12) intersects one principal surface (13) of the plate glass (10) and the edge (16) where the laser-cut side surface (12) intersects the other principal surface (15) of the plate glass (10) are rounded. The radius of curvature (r) of said edges (14, 16) at given points and the thickness (t) of the center of the plate glass (10) satisfy the relation t/3 = r = 2t/3. A phase-contrast microscope or an electron microscope can be used to determine whether or not the side surface of the plate glass (10) was cut by melting the glass. |
