Nippon Electric Glass Co., Ltd.

Setsuo Uchida

Michiharu Eta

Takahide Fujii

Takayuki Noda

Naotoshi Inayama

Sho Itoh

Provided is a cutting method for a glass sheet, comprising radiating a laser beam to a cutting portion (C) of a glass sheet (G) having a thickness of 500 &#x3bc;m or less to fuse the glass sheet (G), wherein a narrowest gap between fused end surfaces (Gaand Gb) of the glass sheet (G), which face each other in the cutting portion (C), is managed to satisfy a relationship of 0.1&#x2266;b/a&#x2266;2, where 'a' is a thickness of the glass sheet (G) and 'b' is the narrowest gap.

Cutting method for glass sheet and glass sheet cutting apparatus

A glass sheet cutting device fuses and divides a glass substrate using a preset cutting line as a boundary while supplying an assist gas and a laser beam from above the glass substrate along the preset cutting line of the glass substrate. The glass sheet cutting device includes a first laser irradiator for radiating a fusing laser beam and a second laser irradiator for radiating an annealing laser beam. Through a fusing gap formed between fused end surfaces by fusing, the second laser irradiator radiates the annealing laser beam obliquely from above onto the fused end surface to be annealed.

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Shiga, Japan

Setsuo Uchida