Reinforced glass and method for producing reinforced glass
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United States of America Patent
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Oct 22, 2024
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app pub date -
Oct 8, 2019
filing date -
Oct 9, 2018
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Abstract
A tempered glass has a surface and a thickness, wherein a stress profile of the tempered glass includes a first peak at the surface, at which the compressive stress becomes a maximum, a first bottom at which the stress, which gradually reduces from the first peak in the depth direction, becomes a local minimum, a second peak at which the compressive stress, which gradually increases from the first bottom in the depth direction, becomes a local minimum, and a second bottom at which the tensile stress, which gradually reduces from the second peak in the depth direction, becomes a minimum. The compressive stress at the first peak is 500 MPa or more, the compressive stress at the second peak P2 is from 15 MPa to 250 MPa, and the depth of layer of the second peak is from 4% to 20% of the thickness.
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