Glass sheet having high infrared radiation transmission

Patent metadata

Field	Value
Publication number	US-2016018949-A1
Application number	US-201414773489-A
Country	US
Kind code	A1
Filing date	Mar 12, 2014
Priority date	Mar 20, 2013
Publication date	Jan 21, 2016
Grant date	—

Abstract

The invention relates to a glass sheet having high infrared radiation transmission, intended, in particular, for use in a touch tablet, panel or screen. More specifically, the invention relates to a glass sheet having a composition comprising, concentrations expressed as a percentage of the total weight of the glass: 55-78% SiO2; 0-18% Al2O3; 0-18% B2O3; 5-20% Na2O; 0-15% CaO; 0-10% MgO; 0-10% K2O; 0-5% BaO; 0.002-0.06% total iron (expressed as Fe2O3), and cobalt (expressed as CoO) varying between 0.001 and 1%.

First claim

1 . A glass sheet having a composition that comprises, in an amount expressed in percentages by total weight of glass:

SiO 2
  55-78%

Al 2 O 3
   0-18%

B 2 O 3
   0-18%

Na 2 O
   5-20%

CaO
   0-15%

MgO
   0-10%

K 2 O
   0-10%

BaO
   0-5%

total iron (expressed in Fe 2 O 3 form)
0.002-0.06%;

wherein the composition comprises a cobalt content (expressed in CoO form) ranging from 0.001 to 1% by weight relative to the total weight of the glass.

2 . The glass sheet of claim 1 , wherein the composition comprises a cobalt content (expressed in CoO form) ranging from 0.005 to 0.5% by weight relative to the total weight of the glass.

3 . The glass sheet of claim 1 , wherein the composition comprises a cobalt content (expressed in CoO form) ranging from 0.001 to 0.1% by weight relative to the total weight of the glass.

4 . The glass sheet of claim 3 , wherein the composition comprises a cobalt content (expressed in CoO form) ranging from 0.002 to 0.05% by weight relative to the total weight of the glass.

5 . The glass sheet of claim 4 , wherein the composition comprises a cobalt content (expressed in CoO form) ranging from 0.002 to 0.02% by weight relative to the total weight of the glass.

6 . The glass sheet of claim 1 , wherein the composition comprises a total iron content (expressed in Fe 2 O 3 form) of 0.002 to 0.04% by weight relative to the total weight of the glass.

7 . The glass sheet of claim 6 , wherein the composition has a total iron content (expressed in Fe 2 O 3 form) of 0.002 to 0.02% by weight relative to the total weight of the glass.

8 . The glass sheet claim 1 , wherein the composition has an Fe 2+ content (expressed in FeO form) of lower than 20 ppm.

9 . The glass sheet of claim 8 , wherein the composition has an Fe 2+ content (expressed in FeO form) of lower than 10 ppm.

10 . The glass sheet of claim 9 , wherein the composition has an Fe 2+ content (expressed in FeO form) of lower than 5 ppm.

11 . The glass sheet of claim 1 , wherein the glass sheet is coated with at least one anti-smudge layer or has been treated so as to limit/prevent smudges from soiling the glass sheet.

12 . A touch screen, touch panel or touch pad, comprising at least one glass sheet of claim 1 , defining a touch surface.

13 . The touch screen, touch panel or touch pad of claim 12 , employing FTIR or PSD optical technology.

14 . A method, comprising detecting the position of an object on a surface of a glass sheet of claim 1 with a touch screen, touch panel or touch pad comprising the glass sheet by employing FTIR or PSD optical technology.

Assignees

• Agc Glass Europe

Inventors

• Lambricht Thomas
• Dogimont Audrey

Classifications

• C03C3/087 Primary

  containing calcium oxide, e.g. common sheet or container glass · CPC title

• G06F2203/04109

  FTIR in optical digitiser, i.e. touch detection by frustrating the total internal reflection within an optical waveguide due to changes of optical properties or deformation at the touch location · CPC title

• C03C2204/00

  Glasses, glazes or enamels with special properties · CPC title

• G06F3/0421 Primary

  by interrupting or reflecting a light beam, e.g. optical touch-screen · CPC title

• C03C4/10

  for infrared transmitting glass · CPC title