METHOD FOR CUTTING TOUGHENED GLASS PLATE
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Nov 26, 2014
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May 29, 2012
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Abstract
A method for cutting a strengthened glass sheet according to a first embodiment of the present invention includes: a step of collecting and scanning laser light in an intermediate layer, thereby forming a first reformed region along a first cutting-scheduled line; and a step of applying an external force to propagate a crack from the first reformed region as a start point in a thickness direction of the strengthened glass sheet, thereby dividing the strengthened glass sheet. In the step of forming the first reformed region, a width d1 (mm) of the first reformed region in the thickness direction is set to d1<2×103×Kc2/{π×(CT)2} based on a fracture toughness Kc (MPa·√m) of the strengthened glass sheet and the tensile stress CT (MPa) remaining in the intermediate layer.
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