Glass-based article with engineered stress distribution and method of making same

Patent metadata

Field	Value
Publication number	US-10483101-B2
Application number	US-201715633000-A
Country	US
Kind code	B2
Filing date	Jun 26, 2017
Priority date	Jun 30, 2016
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

Disclosed herein are glass-based articles having a first surface having an edge, wherein a maximum optical retardation of the first surface is at the edge and the maximum optical retardation is less than or equal to about 40 nm and wherein the optical retardation decreases from the edge toward a central region of the first surface, the central region having a boundary defined by a distance from the edge toward a center point of the first surface, wherein the distance is ½ of the shortest distance from the edge to the center point.

First claim

What is claimed is:

1. A glass-based article comprising:
a first surface having an edge,
wherein a maximum optical retardation of the first surface is at the edge and the maximum optical retardation is less than or equal to about 40 nm, and
wherein the optical retardation decreases from the edge toward a central region of the first surface, the central region having a boundary defined by a distance from the edge toward a center point of the first surface, wherein the distance is ½ of the shortest distance from the edge to the center point.

2. The glass-based article of claim 1 , wherein the first surface has a flatness of less than or equal to about 25 μm.

3. The glass-based article of claim 1 , wherein the article has a coefficient of thermal expansion (CTE) in a range from about 25×10 −7 /° C. to about 130×10 −7 /° C. over a temperature range from 25° C. to 300° C.

4. The glass-based article of claim 1 , wherein the optical retardation at any point along the boundary of the central region is the same.

5. The glass-based article of claim 1 , wherein a shape of the glass-based article is selected from the group consisting of a circle, a square, a rectangle and an oval.

6. The glass-based article of claim 1 , wherein an optical retardation profile on the first surface is symmetrical relative to the center point of the surface.

7. The glass-based article of claim 1 , wherein the maximum optical retardation is less than or equal to about 25 nm.

8. The glass-based article of claim 1 , wherein the maximum optical retardation is less than or equal to about 5 nm.

9. The glass-based article of claim 1 , wherein the first surface has a flatness of less than or equal to about 20 μm.

10. The glass-based article of claim 1 , wherein the edge of the first surface is under compressive stress.

11. The glass-based article of claim 10 , wherein a center of the first surface is under tension.

12. The glass-based article of claim 1 , wherein the edge of the first surface is under tension.

13. The glass-based article of claim 12 , wherein the center of the first surface is under compressive stress.

14. The glass-based article of claim 1 , further comprising a second surface opposing the first surface, wherein a maximum optical retardation of the second surface is at an edge and the maximum optical retardation is less than or equal to about 40 nm.

15. The glass-based article of claim 14 , wherein the first surface has a flatness of less than or equal to about 25 μm.

16. The glass-based article of claim 15 , wherein the second surface has a flatness of less than or equal to about 25 μm.

17. The glass-based article of claim 1 , wherein the article is glass or glass-ceramic.

Assignees

• Corning Inc

Inventors

• Fagan Sumalee Likitvanichkul
• Furnas William John
• Kuksenkova Ekaterina Aleksandrovna

Classifications

• H10P72/7616

  characterised by a coating, a hardness or a material · CPC title

• H10P14/2922 Primary

  being non-crystalline insulating materials, e.g. glass or polymers · CPC title

• C03B29/025

  Glass sheets · CPC title

• C03B25/025

  Glass sheets · CPC title

• C03B23/02

  Re-forming glass sheets · CPC title