The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 17, 2019
Filed:
Mar. 30, 2016
Nippon Electric Glass Co., Ltd., Shiga, JP;
Masanori Wada, Shiga, JP;
Masato Inoue, Shiga, JP;
NIPPON ELECTRIC GLASS CO., LTD., Shiga, JP;
Abstract
With a method of cutting a tube glass (G) according to the present invention, the tube glass (G) is irradiated with laser light (L) having a focal point (F) adjusted to an inside of the tube glass (G), to thereby form an inner crack region (C) including one or more cracks in a portion of the tube glass (G) in a circumferential direction of the tube glass (G) through multiphoton absorption that occurs in an irradiation region of the laser light (L). Then, in the tube glass (G), there is generated a stress that urges the one or more cracks in the inner crack region (C) to propagate in the circumferential direction of the tube glass (G) to cause the one or more cracks to propagate throughout an entire circumference of the tube glass (G), to thereby cut the tube glass (G).