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AssigneeAsahi Glass Company, Limited
InventorsIsao SAITO, Yasunari Iwanaga
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The invention relates to a method for cutting a strengthened glass sheet 10, and the strengthened glass sheet 10 including a front surface layer 13 and a rear surface layer 15 which have a residual compressive stress, and an intermediate layer 17 which is formed between the front surface layer 13 and the rear surface layer 15 and has an inside residual tensile stress is cut by moving an irradiation region 22 of the laser beam. In addition, when initiating the cutting of the strengthened glass sheet 10, a thermal stress which induces the generation of a crack is exerted on a cutting initiation location, the extension of the crack is suppressed simultaneously with the generation of the crack at the cutting initiation location, and then the strengthened glass sheet 10 is cut while suppressing the extension of a crack caused by the inside residual tensile stress in the intermediate layer 17.
A method for cutting a strengthened glass sheet in which a strengthened glass sheet comprising a front surface layer and a rear surface layer which have a residual compressive stress, and an intermediate layer which is provided between the front surface layer and the rear surface layer and has an inside residual tensile stress, is cut by moving an irradiation region of a laser beam to be irradiated on the strengthened glass sheet,
An apparatus for cutting a strengthened glass sheet in which a strengthened glass sheet comprising a front surface layer and a rear surface layer which have a residual compressive stress, and an intermediate layer which is formed between the front surface layer and the rear surface layer and has an inside residual tensile stress, is cut by moving an irradiation region of a laser beam to be irradiated on the strengthened glass sheet, the apparatus comprising:
Dependencies are inferred from the claim text.