CHEMICALLY STRENGTHENED OPTICAL GLASS
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United States of America Patent
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Issued Date -
Oct 24, 2024
app pub date -
Jul 12, 2022
filing date -
Jul 12, 2022
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Abstract
Provided is a chemically strengthened optical glass having an improved impact resistance and a high hardness while maintaining the refractive index, the Abbe number and the transmittance required in the conventional optical glasses. The chemically strengthened optical glass has a compressive stress layer on the surface thereof, contains, in mass % in terms of oxide, 20.0-50.0% of an SiO2 component, 10.0-45.0% of a TiO2 component and 0.1-20.0% of an Na2O component, has a refractive index (nd) of 1.65-1.85, and is characterized by having an impact resistance of 8 cm or more in a sandpaper falling ball test in which a 16.0 g SUS ball is dropped thereon.
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