| CPC C03B 33/091 (2013.01) [C03B 33/0222 (2013.01)] | 10 Claims |
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1. A method of manufacturing a glass sheet, comprising:
an initial crack forming step of forming an initial crack on a first surface of a mother glass sheet; and
a laser irradiation step of irradiating the mother glass sheet with laser light to cause a crack to propagate along a preset cleaving line through use of the initial crack as a starting point,
wherein in the initial crack forming step, the initial crack is formed on the first surface at only a cleaving start point of the preset cleaving line,
wherein the laser irradiation step comprises irradiating a second surface of the mother glass sheet, which is opposite to the first surface, with, as the laser light, CO laser light, Er laser light, Ho laser light, or HF laser light, to thereby cause the crack to propagate in an entire thickness direction of the mother glass sheet while propagating along the preset cleaving line,
wherein the preset cleaving line also has a cleaving end point where the initial crack is not present on the first surface, and
wherein the laser irradiation step comprises irradiating the second surface of the mother glass sheet with the laser light starting at a position on the second surface that is opposite to a location of the initial crack on the first surface, and then irradiating the second surface of the mother glass sheet along the preset cleaving line beyond an end of the initial crack on the first surface to the cleaving end point.
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