Low stored tensile energy dicing glass and preferential crack fragmentation

Patent metadata

Field	Value
Publication number	US-2022017400-A1
Application number	US-201917294912-A
Country	US
Kind code	A1
Filing date	Nov 8, 2019
Priority date	Nov 21, 2018
Publication date	Jan 20, 2022
Grant date	—

Abstract

A glass substrate comprises: a first position, wherein a tensile stress of the glass substrate is insufficient to cause fragmentation of the glass substrate into small pieces upon fracture of the glass substrate; and a second position, wherein the glass substrate is bent relative to the first position, and wherein the tensile stress of the glass substrate is sufficient to cause fragmentation of the glass substrate into small pieces upon fracture of the glass substrate. The glass substrate can include a first surface and a second surface. In the first position, the first surface and the second surface of the glass substrate can be planar. In the second position, the first surface and the second surface of the glass substrate can be planar. The small pieces can be generally cubic. In the second position, the glass substrate can be bent uniaxially along a bend axis of the glass substrate.

First claim

1 . A glass substrate comprising:
a first position, wherein a tensile stress of the glass substrate is insufficient to cause fragmentation of the glass substrate into small pieces upon fracture of the glass substrate; and a second position, wherein the glass substrate is bent relative to the first position, and wherein the tensile stress of the glass substrate is sufficient to cause fragmentation of the glass substrate into small pieces upon fracture of the glass substrate.

2 . The glass substrate of claim 1 ,
a first surface and a second surface; wherein, in the first position, the first surface and the second surface of the glass substrate are planar.

3 . The glass substrate of claim 1 , a first surface and a second surface;
wherein, in the second position, the first surface and the second surface of the glass substrate are planar.

4 . The glass substrate of claim 1 ,
wherein, the small pieces are generally cubic shaped.

5 . The glass substrate of claim 1 ,
in the second position, the glass substrate is bent uniaxially along a bend axis of the glass substrate.

6 . The glass substrate of claim 1 ,
in the second position, the glass substrate is bent biaxially along two bend axes of the glass substrate.

7 . The glass substrate of claim 1 ,
wherein, in the first position, the glass substrate is flatter than the glass substrate is in the second position.

8 . The glass substrate of claim 1 , wherein, in the second position, the glass substrate is flatter than the glass substrate is in the first position.

9 . The glass substrate of claim 1 , further comprising:
a thickness of 2 mm or less.

10 . (canceled)

11 . (canceled)

12 . (canceled)

13 . (canceled)

14 . A method of reducing the size of the pieces that a glass substrate fragments into upon fracture of the glass substrate comprising:
providing a glass substrate that fragments into pieces having a first size upon fracture of the glass substrate; and bending the glass substrate to a second position and maintaining the glass substrate in the second position, such that when the glass substrate fragments into pieces having a second size upon fracture of the glass substrate; wherein, the pieces having the second size are smaller than the pieces having the first size.

15 . The method of claim 14 ,
wherein, the glass substrate comprises a thickness of 2 mm or less.

16 . The method of claim 14 , wherein, bending the glass substrate includes biaxial bending of the glass substrate.

17 . The method of claim 16 , wherein, when the glass substrate fragments, in the second position, upon fracture of the glass substrate, the pieces form an in-plane isotropic fracture pattern.

18 . The method of claim 14 , wherein, bending the glass substrate includes uniaxial bending of the glass substrate along a bend axis of the glass substrate.

19 . (canceled)

20 . (canceled)

21 . The method of claim 14 , wherein, bending and maintaining the glass substrate in the second position is achieved at ambient temperature by a structural component of a product that utilizes the glass substrate.

22 .- 31 . (canceled)

32 . A product comprising:
a glass substrate having a first position, wherein a tensile energy of the glass substrate is insufficient to cause fragmentation of the glass substrate into small pieces upon fracture of the glass substrate; and a component that bends and maintains the glass substrate in a second position, wherein the tensile energy of the glass substrate is sufficient to cause fragmentation of the glass substrate into small pieces upon fracture of the glass substrate.

33 . The product of claim 32 ,
wherein, the product is a consumer electronic device that is configured to be worn on a wrist of a person.

34 . The product of claim 32 ,
wherein, the product is safety glass.

35 . The product of claim 32 ,
wherein, the product is an automotive interior cover glass system.

36 . The product of claim 32 :
wherein, the glass substrate has a first surface and a second surface; and wherein, in the second position, the first surface has a higher compressive stress than the second surface.

37 . (canceled)

38 . (canceled)

39 . (canceled)

40 . (canceled)

41 . (canceled)

Assignees

• Corning Inc

Inventors

• Harris Jason Thomas
• Lezzi Peter Joseph
• Stewart Ross Johnson

Classifications

• Y10T428/24628

  Nonplanar uniform thickness material · CPC title

• C03B27/0442

  for bent glass sheets · CPC title

• C03B27/0413 Primary

  Stresses, e.g. patterns, values or formulae for flat or bent glass sheets · CPC title

• C03B23/023 Primary

  by bending · CPC title

• C03C3/085 Primary

  containing an oxide of a divalent metal · CPC title