Cover glass article

Patent metadata

Field	Value
Publication number	US-9512029-B2
Application number	US-201313774238-A
Country	US
Kind code	B2
Filing date	Feb 22, 2013
Priority date	May 31, 2012
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

A cover glass article includes a glass body having a three-dimensional shape, an inside surface, and an outside surface. Each of the inside and outside surfaces has a surface roughness (R a ) less than 1 nm and is free of indentations having diameters larger than 150 μm.

First claim

The invention claimed is:

1. A cover glass article, comprising:
a three-dimensional shape comprising
an inside surface;
an outside surface; and
at least one bend comprising both the inside and outside surfaces, the at least one bend having a bend radius from about 1 mm to about 20 mm;
wherein each of the inside and outside surfaces has a surface roughness (R a ) less than 1 nm and is free of indentations having diameters larger than 150 μm; and

a wall thickness in the range from 0.3 mm to 3 mm, wherein the variation in the wall thickness is ±15% or less.

2. The cover glass article of claim 1 , wherein each of the inside and outside surfaces has a surface roughness (R a ) less than 0.7 nm.

3. The cover glass article of claim 1 , wherein at least one of the inside and outside surfaces has a surface roughness (R a ) less than 0.3 nm.

4. The cover glass article of claim 1 , wherein a variation in the wall thickness is within ±10% or less.

5. The cover glass article of claim 1 , wherein the glass body further comprises less than ten non-indentation defects observable by the unaided human eye at 1000 lux in a 25 mm×25 mm area on any of the surface.

6. The cover glass article of claim 1 , wherein the glass body has a flat section.

7. The cover glass article of claim 6 , wherein the flatness of the flat section is better than ±150 μm over a 10 mm×10 mm area.

8. The cover glass article of claim 6 , wherein the flatness of the flat section is better than ±50 μm over a 25 mm×25 mm area.

9. The cover glass article of claim 1 , wherein the at least one bend section is a spline.

10. The cover glass article of claim 1 , wherein the glass body has an optical transmission greater than 85% at 1 mm thickness in a wavelength range of 400 nm to 800 nm.

11. The cover glass article of claim 1 , wherein the glass body has a compressive stress greater than 300 MPa.

12. The cover glass article of claim 1 , wherein the cover glass is tempered.

13. The cover glass article of claim 12 , wherein the glass body is chemically tempered.

14. The cover glass article of claim 1 , wherein the glass body comprises an ion-exchanged glass.

15. The cover glass article of claim 14 , wherein the ion-exchanged glass has a depth of layer of greater than 15 μm.

16. The cover glass article of claim 1 , wherein the glass body is adapted for covering an electronic device having a flat display.

17. The cover glass article of claim 16 , wherein the electronic device is a telephone, monitor, television, handheld device, or tablet.

18. A cover glass article, comprising:
a three-dimensional shape comprising
an inside surface;
an outside surface; and
at least one bend comprising both the inside and outside surfaces, the at least one bend section having a bend radius from about 1 mm to about 20 mm;
wherein each of the inside and outside surfaces has a surface roughness (Ra) less than 1 nm and is free of indentations having diameters larger than 150 μm; and

a wall thickness in the range from 0.3 mm to 3 mm, wherein the variation in the wall thickness is ±150 μm or less.

19. The cover glass article of claim 18 , wherein each of the inside and outside surfaces has a surface roughness (R a ) less than 0.7 nm.

20. The cover glass article of claim 18 , wherein at least one of the inside and outside surfaces has a surface roughness (R a ) less than 0.3 nm.

21. The cover glass article of claim 18 , wherein a variation in the wall thickness is +100 μm or less.

22. The cover glass article of claim 18 , wherein the glass body further comprises less than ten non-indentation defects observable by the unaided human eye at 1000 lux in a 25 mm×25 mm area on any of the surface.

23. The cover glass article of claim 18 , wherein the glass body has a flat section.

24. The cover glass article of claim 23 , wherein the flatness of the flat section is better than ±150 μm over a 10 mm×10 mm area.

25. The cover glass article of claim 23 , wherein the flatness of the flat section is better than ±50 μm over a 25 mm×25 mm area.

26. The cover glass article of claim 18 , wherein the at least one bend section is a spline.

27. The cover glass article of claim 18 , wherein the glass body has an optical transmission greater than 85% at 1 mm thickness in a wavelength range of 400 nm to 800 nm.

28. The cover glass article of claim 18 , wherein the glass body has a compressive stress greater than 300 MPa.

29. The cover glass article of claim 18 , wherein the cover glass is tempered.

30. The cover glass article of claim 29 , wherein the glass body is chemically tempered.

31. The cover glass article of claim 18 , wherein the glass body comprises an ion-exchanged glass.

32. The cover glass article of claim 18 , wherein the ion-exchanged glass has a depth of layer of greater than 15 μm.

33. The cover glass article of claim 18 , wherein the glass body is adapted for covering an electronic device having a flat display.

34. The cover glass article of claim 33 , wherein the electronic device is a telephone, monitor, television, handheld device, or tablet.

35. The cover glass article of claim 1 , wherein the three-dimensional shape is thermally reformed.

36. The cover glass article of claim 18 , wherein the three-dimensional shape is thermally reformed.

Assignees

• Ehemann Karl David
• Gaylo Keith Raymond
• Mattingly Iii William Brashear
• O'Malley Connor Thomas
• Ukrainczyk Ljerka
• Wasson Kevin Lee
• Corning Inc

Inventors

• Ehemann Karl David
• Gaylo Keith Raymond
• Mattingly Iii William Brashear
• O'Malley Connor Thomas
• Ukrainczyk Ljerka
• Wasson Kevin Lee

Classifications

• C03C3/083

  containing aluminium oxide or an iron compound · CPC title

• Y10T428/131

  Glass, ceramic, or sintered, fused, fired, or calcined metal oxide or metal carbide containing [e.g., porcelain, brick, cement, etc.] · CPC title

• C03C21/002 Primary

  to perform ion-exchange between alkali ions (C03C21/005 takes precedence) · CPC title

• C03B23/023

  by bending · CPC title

• H05K5/0086

  portable, e.g. battery operated apparatus (casings for switching devices H01H9/02) · CPC title