Methods for controlled laser-induced growth of glass bumps on glass articles

Patent metadata

Field	Value
Publication number	US-9714194-B2
Application number	US-201615141647-A
Country	US
Kind code	B2
Filing date	Apr 28, 2016
Priority date	Jul 24, 2015
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

A method for controlling formation of glass bumps in a glass article with laser-irradiation without the use of a growth-limiting structure. Standard deviation of height between the glass bumps on the article is less than 1 micron by controlling the laser radiation dose provided on the glass article.

First claim

What is claimed is:

1. A glass article including a plurality of glass bumps formed on a surface of the glass article, each glass bump having a height spaced apart from the glass article surface, at least one of the plurality of glass bumps comprising:
a lower region comprising a diameter D 1 defined by concavely rounded sides, wherein the lower region projects from the surface of the glass pane, wherein diameter D 1 is the glass bump maximum diameter, wherein the concavely rounded sides have a radius of curvature R 1 and join with the glass article surface;
an inflection region connecting the lower region of the glass bump and an upper region of the glass bump;
the upper region of the glass bump comprising a transition portion and a top portion;
the transition portion comprising a diameter D 2 defined by convexly rounded sides, wherein the convexly rounded sides have a radius of curvature R 2 , wherein diameter D 2 is less than diameter D 1 ; and
the top portion comprising a diameter D 3 defined by a convexly rounded top surface, the convexly rounded top surface joining with the convexly rounded sides converging from the transition portion, wherein the convexly rounded top surface has a radius of curvature R 3 from about 600 microns to about 750 microns which is greater than the radius of curvature R 2 , wherein diameter D 3 is less than diameter D 2 , wherein the convexly rounded top surface is spaced apart from the glass article surface defining a height H of the glass bump.

2. The glass article of claim 1 wherein a standard deviation of height between the plurality of glass bumps is less than 1 micron.

3. The glass article of claim 1 wherein a standard deviation of height between the plurality of glass bumps is less than 0.5 micron.

4. The glass article of claim 1 wherein the radius of curvature R 1 of concavely rounded sides of the lower region is from about 25 microns to about 100 microns.

5. The glass article of claim 1 wherein diameter D 1 of the lower region is from about 400 microns to about 800 microns.

6. The glass article of claim 1 wherein the radius of curvature R 2 of the convexly rounded sides of the transition portion is from about 200 microns to about 400 microns over at least 5% of the glass bump height H.

7. The glass article of claim 1 wherein diameter D 2 of the transition portion decreases from the inflection region to the top portion by about 15% to about 65%.

8. The glass article of claim 1 wherein diameter D 2 of the transition portion is from about 100 microns to about 600 microns.

9. The glass article of claim 1 wherein diameter D 3 of the top portion is from about 100 to about 264 microns.

10. The glass article of claim 1 wherein glass bump height H is from about 50 microns to about 200 microns.

11. The glass article of claim 1 wherein at least one of the plurality glass bumps include a hemispherical lateral cross-section, wherein the lateral cross-section substantially corresponds to a general circle curve equation with a coefficient of determination from 0.9 to 0.99.

12. The glass article of claim 1 wherein the lower region is from about 5% to about 25% of glass bump height H.

13. The glass article of claim 1 wherein the upper region is from about 75% to about 95% of glass bump height H.

14. The glass article of claim 1 wherein the top portion is from about 1% to about 3% of glass bump height H.

15. The glass article of claim 1 wherein the glass article is a glass pane.

16. The glass article of claim 15 wherein the glass pane is included within a vacuum insulated glass window.

17. A glass article including a plurality of glass bumps formed on a surface of the glass article, each glass bump having a height spaced apart from the glass article surface, at least one of the plurality of glass bumps comprising:
a lower region comprising a volume V 1 with a diameter D 1 defined by concavely rounded sides, wherein the lower region projects from the glass pane surface, wherein diameter D 1 is the glass bump maximum diameter, wherein the concavely rounded sides have a radius of curvature R 1 and join with the glass pane surface;
an inflection region connecting the lower region of the glass bump and an upper region of the glass bump;
the upper region comprising a volume V 2 having a transition portion and a top portion;
the transition portion comprising a diameter D 2 defined by convexly rounded sides, wherein the convexly rounded sides have a radius of curvature R 2 , wherein diameter D 2 is less than diameter D 1 ; and
the top portion comprising a diameter D 3 defined by a convexly rounded top surface, the convexly rounded top surface joining with the convexly rounded sides converging from the transition portion, wherein the convexly rounded top surface has a radius of curvature R 3 from about 600 microns to about 750 microns which is greater than the radius of curvature R 2 , wherein diameter D 3 is less than diameter D 2 , wherein the convexly rounded top surface is spaced apart from the glass pane surface defining a maximum height H of the glass bump.

18. The glass article of claim 17 wherein a standard deviation of height between the plurality of glass bumps is less than 1 micron.

19. The glass article of claim 17 wherein a standard deviation of height between the plurality of glass bumps is less than 0.5 micron.

20. The glass article of claim 17 wherein the radius the radius of curvature R 3 of the convexly rounded top surface is greater than the radius of curvature R 2 for the convexly rounded sides.

21. The glass article of claim 17 wherein R 3 is greater than R 2 by about 70% to about 140%.

22. The glass article of claim 17 wherein the radius of curvature R 3 of the convexly rounded top surface is greater than the radius of curvature R 1 for the concavely rounded sides of the lower region.

Assignees

• Corning Inc

Inventors

• Masters Leonard Thomas
• Streltsov Alexander Mikhailovich

Classifications

• C03C23/002

  by ultraviolet light · CPC title

• C03C23/0025 Primary

  by a laser beam · CPC title

• B23K26/355

  Texturing · CPC title

• B23K2103/54

  Glass · CPC title

• B32B17/06

  comprising glass as the main or only constituent of a layer, next to another layer of a specific {material} · CPC title