Chemically strengthened glass
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United States of America Patent
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Feb 6, 2018
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Jan 19, 2016
filing date -
Jul 19, 2013
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Abstract
A chemically strengthened glass having a compressive stress layer formed in a surface layer thereof according to an ion exchange method, in which the glass has a surface roughness (Ra) of 0.20 nm or higher, a hydrogen concentration Y in a region to a depth X from an outermost surface of the glass satisfies the following relational equation (I) at X=from 0.1 to 0.4 (μm), a surface strength F (N) measured by a ball-on-ring test under the following conditions is (F≧1500×t2) relative to a sheet thickness t (mm) of the glass, and a surface of the glass has no polishing flaw:
in which meanings of respective symbols in the equation (I) are as follows: Y: hydrogen concentration (as H2O, mol/L); X: depth from the outermost surface of the glass (μm); a: −0.270 to −0.005; and b: 0.020 to 0.220.
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