Patent ID: 9206079
Filing Date: 2015-12-08
Classification: C03C,Y10T

Abstract:
1. A chemically strengthened glass plate manufactured by ion exchange of a surface of a glass plate to replace alkali metal ions A which are largest in amount among all alkali metal ion components of the glass plate with alkali metal ions B having a larger ionic radius than the alkali metal ions A, the chemically strengthened glass plate having: a surface compressive stress of not less than 600 MPa at a surface of the chemically strengthened glass plate; and a compressive stress layer containing two types of stress patterns X and Y, the stress pattern X being a stress pattern of a surface portion of the glass plate, the stress pattern Y being a stress pattern of an inside of the glass plate, wherein the stress patterns satisfy the formula S wherein, when an interference pattern of the chemically strengthened glass plate is observed with a surface stress meter based on a principle of an optical waveguide effect, at least one of values r wherein the compressive stress layer at the surface of the chemically strengthened glass plate has a depth of 5 to 25 μm.