DISPLAY COVER GLASS AND DISPLAY COVER GLASS FABRICATION METHOD
First Claim
1. A cover glass for a display, wherein a depth of a compressive stress layer (DOL) is 30 μ
- m or more, a surface compressive stress is 300 MPa or more, a position (HW) at which a compressive stress is half of a value of the surface compressive stress is a position of 8 μ
m or more from a glass surface, and the depth of the compressive stress layer (DOL) and the position (HW) at which the compressive stress is half of the value of the surface compressive stress satisfy the following formula;
0.05≦
HW/DOL≦
0.23
(1).
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Accused Products
Abstract
The present invention provides a cover glass for a display, having high durability to slow cracking and strong abraded strength even though a compressive stress is large and a depth of a compressive stress layer is deep. The present invention relates to a cover glass for a display, in which a depth of a compressive stress layer (DOL) is 30 μm or more, a surface compressive stress is 300 MPa or more, a position (HW) at which a compressive stress is half of a value of the surface compressive stress is a position of 8 μm or more from a glass surface, and the depth of the compressive stress layer (DOL) and the position (HW) at which the compressive stress is half of the value of the surface compressive stress satisfy the following formula:
0.05≦HW/DOL≦0.23 (1).
88 Citations
6 Claims
-
1. A cover glass for a display, wherein a depth of a compressive stress layer (DOL) is 30 μ
- m or more, a surface compressive stress is 300 MPa or more, a position (HW) at which a compressive stress is half of a value of the surface compressive stress is a position of 8 μ
m or more from a glass surface, and the depth of the compressive stress layer (DOL) and the position (HW) at which the compressive stress is half of the value of the surface compressive stress satisfy the following formula;
0.05≦
HW/DOL≦
0.23
(1).
- m or more, a surface compressive stress is 300 MPa or more, a position (HW) at which a compressive stress is half of a value of the surface compressive stress is a position of 8 μ
-
2. A cover glass for a tablet PC with a touch sensor function, having a compressive stress layer in which a surface compressive stress is 300 MPa or more and a depth of the compressive stress layer (DOL) is 15 μ
- m or more, and having a thickness of less than 0.8 mm, a size of 150 to 350 mm×
100 to 250 mm and a mass of 150 to 1,000 g,wherein the surface compressive stress (CS)×
the depth of the compressive stress layer (DOL) is 35 MPa·
mm or less.
- m or more, and having a thickness of less than 0.8 mm, a size of 150 to 350 mm×
-
3. A method for manufacturing a cover glass for a display, the cover glass having a depth of a compressive stress layer of 30 μ
- m or more and a surface compressive stress of 300 MPa or more, the method sequentially including the following steps (1) to (3);
(1) a first chemical strengthening step of forming a compressive stress layer on a glass surface by subjecting a glass to an ion-exchange treatment; (2) a heating step of heat-treating the glass at a temperature 50°
C. or more lower than a glass transition temperature; and(3) a second chemical strengthening step of further forming a compressive stress layer on the glass surface by subjecting the glass to an ion-exchange treatment. - View Dependent Claims (4, 5, 6)
- m or more and a surface compressive stress of 300 MPa or more, the method sequentially including the following steps (1) to (3);
Specification