STRENGTHENED GLASS ARTICLES AND METHODS OF MAKING
First Claim
Patent Images
1. A strengthened glass article, the strengthened glass article having a thickness t<
- 0.5 mm and comprising;
an outer region, the outer region extending from a surface of the article to a depth of layer DOL within the article, wherein the outer region is under a compressive stress CS; and
an inner region, wherein the inner region is under a central tension CT, and wherein −
15.7 (MPa/mm)·
t(mm)+52.5 (MPa)<
CT (MPa)≦
57 (MPa)−
9.0 (MPa/mm)·
ln(t)(mm)+49.3 (MPa/mm)·
ln2(t)(mm).
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Accused Products
Abstract
A strengthened glass article having a central tension that is below a threshold value above which the glass exhibits frangible behavior. The central tension varies non-linearly with the thickness of the glass. The glass article may be used as cover plates or windows for portable or mobile electronic devices such as cellular phones, music players, information terminal (IT) devices, including laptop computers, and the like.
30 Citations
27 Claims
-
1. A strengthened glass article, the strengthened glass article having a thickness t<
- 0.5 mm and comprising;
an outer region, the outer region extending from a surface of the article to a depth of layer DOL within the article, wherein the outer region is under a compressive stress CS; and an inner region, wherein the inner region is under a central tension CT, and wherein −
15.7 (MPa/mm)·
t(mm)+52.5 (MPa)<
CT (MPa)≦
57 (MPa)−
9.0 (MPa/mm)·
ln(t)(mm)+49.3 (MPa/mm)·
ln2(t)(mm). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- 0.5 mm and comprising;
-
11. A strengthened glass article, the strengthened glass article having a thickness t<
- 0.5 mm and comprising;
an outer region, the outer region extending from a surface of the article to a depth of layer DOL within the article, wherein the outer region is under a compressive stress CS; and an inner region under a central tension CT, wherein CT (MPa)>
−
38.7 (MPa/mm)·
ln(t)(mm)+48.2 (MPa), and wherein the strengthened glass article is substantially non-frangible when subjected to a point impact that is sufficient to break the strengthened glass article. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
- 0.5 mm and comprising;
-
21. A strengthened glass article, the strengthened glass article having a thickness t<
- 0.5 mm and comprising;
an outer region extending from a surface of the article to a depth of layer DOL of at least 30 μ
m within the article, wherein the outer region is under a compressive stress CS of at least 600 MPa; andan inner region, wherein the inner region is under a central tension CT, and wherein −
38.7 (MPa/mm)·
ln(t)(mm)+48.2 (MPa)≦
CT (MPa)≦
57 (MPa)−
9.0 (MPa/mm)·
ln(t)(mm)+49.3 (MPa/mm)·
ln2(t)(mm),wherein the strengthened glass article is substantially non-frangible and has a frangibility index of less than 3 when subjected to a point impact sufficient to break the strengthened glass article. - View Dependent Claims (22, 23, 24, 25, 26, 27)
- 0.5 mm and comprising;
Specification