The present invention provides a glass material exhibiting a high light transmittance at a working wavelength. The glass material includes, in terms of % by mole, from 26% to 40% of Tb.sub.2O.sub.3, greater than 12% and 40% or less of B.sub.2O.sub.3, from 1% to 20% of Al.sub.2O.sub.3, from 1% to 40% of SiO.sub.2, from 0% to 5% of P.sub.2O.sub.5, and greater than 14% and 74% or less of B.sub.2O.sub.3+Al.sub.2O.sub.3+SiO.sub.2+P.sub.2O.sub.5.

Compounds, compositions, articles, devices, and methods for the manufacture of light guide plates and back light units including such light guide plates made from glass. In some embodiments, light guide plates (LGPs) are provided that have similar or superior optical properties to light guide plates made from PMMA and that have exceptional mechanical properties such as rigidity, CTE and dimensional stability in high moisture conditions as compared to PMMA light guide plates.

A crystallized glass includes a crystallized glass mother material, and, in a surface, a compressive stress layer, wherein the crystallized glass has, for a thickness of 10 mm, a light transmittance of, including reflection loss, 80% at a wavelength in 400 to 669 nm, and has a Vickers hardness [Hv] of 835 to 1300. In the crystallized glass, the crystallized glass mother material contains, in % by weight on an oxide basis, 40.0% to 70.0% of a SiO.sub.2 component, 11.0% to 25.0% of an Al.sub.2O.sub.3 component, 5.0% to 19.0% of a Na.sub.2O component, 0% to 9.0% of a K.sub.2O component, 1.0% to 18.0% of a MgO component, 0% to 3.0% of a CaO component, and 0.5% to 12.0% of a TiO.sub.2 component, and a total content of the SiO.sub.2 component, the Al.sub.2O.sub.3 component, the Na.sub.2O component, the K.sub.2O component, the MgO component, and the TiO.sub.2 component is 90% or more.

A glass ceramic article including a lithium disilicate crystalline phase, a petalite crystalline phased, and a residual glass phase. The glass ceramic article has a warp (μm)<(3.65×10.sup.−9/μm×diagonal.sup.2) where diagonal is a diagonal measurement of the glass ceramic article in μm, a stress of less than 30 nm of retardation per mm of glass ceramic article thickness, a haze (%)<0.0994t+0.12 where t is the thickness of the glass ceramic article in mm, and an optical transmission (%)>0.91×10.sup.(2−0.03t) of electromagnetic radiation wavelengths from 450 nm to 800 nm, where t is the thickness of the glass ceramic article in mm.

Compounds, compositions, articles, devices, and methods for the manufacture of light guide plates and back light units including such light guide plates made from glass. In some embodiments, light guide plates (LGPs) are provided that have similar or superior optical properties to light guide plates made from PMMA and that have exceptional mechanical properties such as rigidity, CTE and dimensional stability in high moisture conditions as compared to PMMA light guide plates.

A method of producing flint glass using submerged combustion melting involves introducing a vitrifiable feed material into a glass melt contained within a submerged combustion melter. The vitrifiable feed material is formulated to provide the glass melt with a glass chemical composition suitable for producing flint glass articles. To that end, the glass melt comprises a total iron content expressed as Fe.sub.2O.sub.3 in an amount ranging from 0.04 wt % to 0.06 wt % and also has a redox ratio that ranges from 0.1 to 0.4, and the vitrifiable feed material further includes between 0.008 wt % and 0.016 wt % of selenium or between 0.1 wt % and 0.2 wt % of manganese oxide in order to achieve an appropriate content of selenium or manganese oxide in the glass melt.

Compounds, compositions, articles, devices, and methods for the manufacture of light guide plates and back light units including such light guide plates made from glass. In some embodiments, light guide plates (LGPs) are provided that have similar or superior optical properties to light guide plates made from PMMA and that have exceptional mechanical properties such as rigidity, CTE and dimensional stability in high moisture conditions as compared to PMMA light guide plates.

A glass article includes: a glass phase including a first structure in which a silicon atom is covalently bonded to four first oxygen atoms; and a plurality of crystals dispersed in the glass phase. The crystals include beta-quartz crystals, each of the beta-quartz crystals includes the first structure and a second structure in which aluminum is covalently bonded to four second oxygen atoms, and a crystallinity of the beta-quartz crystals is in a range of about 40% to about 50%.

The present invention relates to a strengthening method developed for use in chambered glass products with complex shape and with thin walls and having crystalline structure and comprising SiO.sub.2+B.sub.2O.sub.3 in the range of 68-74% by weight; AI.sub.2O.sub.3 in the range of 0-2% by weight; Fe.sub.2O.sub.3 in the range of 0-0.02% by weight; Na.sub.2O in the range of 8.5-12% by weight; K.sub.2O in the range of 5-9% by weight; CaO in the range of 5-9% by weight; MgO in the range of 0-0.5% by weight; BaO in the range of 0-4% by weight; ZnO in the range of 0-3% by weight; TiO.sub.2 in the range of 0-0.05% by weight; Sb.sub.2O.sub.3 in the range of 0-0.25% by weight and Er.sub.2O.sub.3 in the range of 0-0.05% by weight.

A glass ceramic article including a lithium disilicate crystalline phase, a petalite crystalline phased, and a residual glass phase. The glass ceramic article has a warp (μm)<(3.65×10.sup.−9/μm×diagonal.sup.2) where diagonal is a diagonal measurement of the glass ceramic article in μm, a stress of less than 30 nm of retardation per mm of glass ceramic article thickness, a haze (%)<0.0994t +0.12 where t is the thickness of the glass ceramic article in mm, and an optical transmission (%)>0.91×10.sup.(2-0.03t) of electromagnetic radiation wavelengths from 450 nm to 800 nm, where t is the thickness of the glass ceramic article in mm.