OPTICAL GLASS AND METHOD OF CUTTING GLASS SUBSTRATE

摘要

Provided are a method of cutting a glass substrate which is capable of secure cutting by a simpler operation and an optical glass having high bending strength and dimension accuracy obtained by that method. The method of cutting the glass substrate comprising: forming selectively a plurality of reformed portions with a crack extending in the glass substrate from at least one of the plurality of reformed portions by radiating light to be focused inside the glass substrate so as to form a reformed region; and making a fracture occur in a thickness direction of the glass substrate along the reformed region so as to cut the glass substrate, wherein the crack has a tip portion at a depth of 3 to 20% of a thickness of the glass substrate from a cut surface, and an optical glass 100 is obtained by the above cutting method.

主权项

1. An optical glass, comprising:
a glass plate comprising a principal surface and an end surface; a reformed region formed on the end surface; a plurality of reformed portions formed by light radiated to be focused thereto in the reformed region; and a crack extending from the reformed portion on the end surface, having a tip portion at a depth of 3 to 20% of a plate thickness of the glass plate from the end surface.