Glass sheet with high near-IR transmission and very low visible transmission
AssigneeAgc Glass Europe
InventorMichel Bogaerts
Life of this patent
Estimating the term…
Abstract
A glass sheet having a high near-IR transmission and very low visible transmission. The glass sheet is a silicate-type and has a composition that includes, in a content expressed as weight percentages, by total weight of glass: total iron (expressed as Fe2O3) 0.02-1%, Chromium (expressed as Cr2O3) 0.05-0.8%, Cobalt (expressed as Co) 0.03-0.175%. The glass sheet shows, intrinsically, a very low visible transmission together with a high IR transmission at wavelengths of interest (i.e. 850, 900 and 950 nm) and low amounts of Cr6+ species. The glass sheet is therefore valuable within the context of autonomous cars and in particular, those with fully integrating LiDAR systems.
Claims20
A glass sheet of silicate-type comprising, in a content expressed as weight percentages, by total weight of glass:
- SiO2
- 40-78%;
- Al2O3
- 0-18%;
- B2O3
- 0-18%;
- Na2O
- 0-20%;
- CaO
- 0-15%;
- MgO
- 0-10%;
- K2O
- 0-10%;
- BaO
- 0-5%;
- total iron (expressed as Fe2O3)
- 0.02-0.667%;
- Chromium (expressed as Cr2O3)
- 0.05-0.8%;
- and
- Cobalt (expressed as Co)
- 0.03-0.175%,
- and
- wherein:
- Cr2O3<1-5.5*Co, and
- 1.2<Cr2O3/Fe2O3≤2.7, and
- wherein the glass sheet has a T850 higher than 80%.
A glass sheet of silicate-type comprising, in a content expressed as weight percentages, by total weight of glass:
- SiO2
- 40-78%;
- Al2O3
- 0-18%;
- B2O3
- 0-18%;
- Na2O
- 0-20%;
- CaO
- 0-15%;
- MgO
- 0-10%;
- K2O
- 0-10%;
- BaO
- 0-5%;
- total iron (expressed as Fe2O3)
- 0.06-0.667%;
- Chromium (expressed as Cr2O3)
- 0.05-0.8%;
- and
- Cobalt (expressed as Co)
- 0.03-0.175%,
- and
- wherein:
- Cr2O3<1-5.5*Co, and
- 1.2<Cr2O3/Fe2O3≤2.7, and
- wherein the glass sheet has a TLD4 lower than 8%.
A glass sheet of silicate-type comprising, in a content expressed as weight percentages, by total weight of glass:
- SiO2
- 40-78%;
- Al2O3
- 0-18%;
- B2O3
- 0-18%;
- Na2O
- 0-20%;
- CaO
- 0-15%;
- MgO
- 0-10%;
- K2O
- 0-10%;
- BaO
- 0-5%;
- total iron (expressed as Fe2O3)
- 0.02-0.667%;
- Chromium (expressed as Cr2O3)
- 0.1-0.8%;
- and
- Cobalt (expressed as Co)
- 0.03-0.175%,
- and
- wherein:
- Cr2O3<1-5.5*Co, and
- 1.2<Cr2O3/Fe2O3≤2.7, and
- the glass sheet comprises no colorants other than total iron, chromium, and cobalt, except that other colorants may be present as impurities.
Dependencies are inferred from the claim text.