GLASS PLATE, AND METHOD OF PROCESSING GLASS PLATE
A glass plate has, at least at a part of an outer edge, an adjacent surface that intersects a principal plane at an obtuse angle, wherein the adjacent surface is a cutting plane formed by an extension of a crack, and the adjacent surface forms a diffraction grating including at least one of a Wallner line and an Arrest line.
1 . A glass plate comprising:
an adjacent surface that intersects a principal plane at an obtuse angle, the adjacent surface being, at lease, at a part of an outer edge,
wherein the adjacent surface is a cutting plane formed by an extension of a crack, and the adjacent surface forms a diffraction grating including at least one of a Wallner line and an Arrest line.
2 . The glass plate according to claim 1 , wherein the at least one of the Wallner line and the Arrest line is arranged along at least a part of an outer edge of the glass plate.
3 . The glass plate according to claim 1 , wherein, when the glass plate is viewed in a direction perpendicular to the principal plane, the at least one of the Wallner line and the Arrest line is curved.
4 . The glass plate according to claim 1 , wherein at least a part of the diffraction grating is formed of at least one of the Wallner lines arranged with an equal pitch and the Arrest lines arranged with an equal pitch.
5 . The glass plate according to claim 1 , wherein the adjacent surface is the cutting plane formed by scanning a laser beam along at least a part of an outer edge of the glass plate.
6 . A method of processing a glass plate comprising:
a step of forming, in the glass plate, an adjacent surface that intersects a principal plane of the glass plate at an obtuse angle by locally heating the glass plate by irradiation of a laser beam, and by displacing a position where the laser beam is irradiated,
wherein the adjacent surface is a cutting plane formed by an extension of a crack, and the adjacent surface forms a diffraction grating including at least one of a Wallner line and an Arrest line.
7 . A method of processing a glass plate comprising:
a step of simultaneously forming, in the glass plate, a first adjacent surface that intersects a first principal plane of the glass plate at an obtuse angle and a second adjacent surface that intersects a second principal plane of the glass plate at an obtuse angle by locally heating the glass plate by irradiation of a laser beam, and by displacing a position where the laser beam is irradiated,
wherein each of the first adjacent surface and the second adjacent surface is a cutting plane formed by an extension of a crack, and each of the first adjacent surface and the second adjacent surface forms a diffraction grating including at least one of a Wallner line and an Arrest line.