Abstract: Thin glasses having high refractive index (nd), a layer composite assembly made from these thin glasses, a method for the production of the thin glasses, and the uses of the thin glasses are provided. The thin glasses are processed in an in line manufacturing process and have the optical properties of a classical optical glass. The thin glasses are highly transparent, crystallization-resistant, chemically resistant and highly refractive. The viscosity/temperature behavior of the thin glasses is adjusted to the manufacturing process via in line flat glass methods.

Abstract: A highly refractive and highly transparent optical glass is provided. The use of such a glass, optical elements and processes for producing the glass or the optical elements are also provided.

Abstract: Thin glasses having high refractive index (nd), a layer composite assembly made from these thin glasses, a method for the production of the thin glasses, and the uses of the thin glasses are provided. The thin glasses are processed in an in line manufacturing process and have the optical properties of a classical optical glass. The thin glasses are highly transparent, crystallization-resistant, chemically resistant and highly refractive. The viscosity/temperature behavior of the thin glasses is adjusted to the manufacturing process via in line flat glass methods.

Abstract: A highly refractive and highly transparent optical glass is provided. The use of such a glass, optical elements and processes for producing the glass or the optical elements are also provided.

Abstract: A lens system having an infrared filter for a compact camera module is provided. The lens system is an achromatic lens system and has two lenses. The first lens has a positive focal length, and the second lens has a negative focal length. The first lens is made of copper ion containing glass which absorbs infrared light and functions as an infrared filter. The second lens has an Abbe number that is smaller than that of the first lens with a difference between the Abbe numbers of the first lens and the second lens being at least 15.

Abstract: The lead-free and arsenic-free optical glasses have a refractive index of 1.83?nd?1.95 and an Abbé number of 24??d?35, good chemical resistance, excellent crystallization stability and a composition, in wt. % based on oxide content, of SiO2, 2-8; B2O3, 15-22; La2O3, 35-42; ZnO, 10-18; TiO2, 9-15; ZrO2, 3-10; Nb2O5, 4-10; and WO3, >0.5-3. Besides containing at most 5 wt. % of each of GeO2, Ag2O and BaO and conventional fining agents, they may also contain at most in total 5 wt. % of Al2O3, MgO, CaO, SrO, P2O5 and up to at most in total 5 wt. % of the components F, Ta2O5. The glasses are preferably free of alkali metal oxides, Bi2O3, Y2O3, Gd2O3 and/or Yb2O3. Optical elements made from the optical glass are also described.

Abstract: The lead-free and arsenic-free optical glasses have a refractive index of 1.83?nd?1.95 and an Abbé number of 24??d?35, good chemical resistance, excellent crystallization stability and a composition, in wt. % based on oxide content, of SiO2, 2-8; B2O3, 15-22; La2O3, 35-42; ZnO, 10-18; TiO2, 9-15; ZrO2, 3-10; Nb2O5, 4-10; and WO3, >0.5-3. Besides containing at most 5 wt. % of each of GeO2, Ag2O and BaO and conventional fining agents, they may also contain at most in total 5 wt. % of Al2O3, MgO, CaO, SrO, P2O5 and up to at most in total 5 wt. % of the components F, Ta2O5. The glasses are preferably free of alkali metal oxides, Bi2O3, Y2O3, Gd2O3 and/or Yb2O3. Optical elements made from the optical glass are also described.

Abstract: A method and an apparatus for the rapid melting of glasses in a skull crucible is provided. The method and apparatus introduce high-frequency energy into the contents of the crucible by means of a coil arrangement surrounding the skull crucible, in order to heat the melt, and the batch is laid and the molten glass discharged in the upper region of the crucible, and undissolved constituents of the batch are retained by means of a cooled bridge which is immersed in the melt. The glass is taken off above the coil arrangement and is fed for further processing without flowing through the coil region.

Abstract: The present invention relates to lead and arsenic free optical glasses, used for the application areas imaging, digital projection, photolithography, laser technology, wafer/chip technology as well as telecommunication, optical communications engineering, optics, illumination and in the automotive sector. The glasses have a refraction power of from 1.73?nd?1.82 and an Abbé value of 43?vd?53 with good chemical consistency and excellent crystallisation stability with the following composition (in weight-%): SiO2 0.1-5.5 B2O3 27-35 La2O3 42-48 BaO 0-5 ZnO 0.5-5?? Y2O3 ?6-12 TiO2 0-4 ZrO2 ?4-10 Nb2O5 0-5 WO3 ?0-5.

Abstract: The present invention relates to lead and arsenic free optical glasses, used for the application areas imaging, digital projection, photolithography, laser technology, wafer/chip technology as well as telecommunication, optical communications engineering, optics, illumination and in the automotive sector. The glasses have a refraction power of from 1.73?nd?1.82 and an Abbé value of 43?vd?53 with good chemical consistency and excellent crystallisation stability with the following composition (in weight-%): SiO2 0.1-5.5 B2O3 27-35 La2O3 42-48 BaO 0-5 ZnO 0.

Abstract: The invention relates to optical glasses that are composed as follows: 5-35% by weight of SiO2, 55-88% by weight of PbO; 0-10% by weight of B2O3; 0-5% by weight of Na2O, 0-5% by weight of K2O; 0-10% by weight of TiO2, 0-10% by weight of ZrO2; 0-10% by weight of La2O3; 0-10% by weight of BaO; 0-10% by weight of ZnO, with the proviso that S(Na2O; K2O): 0=x=8 and S(TiO2; ZrO2; La2O3; ZnO; BaO): x=15. The glasses are particularly suitable for LCD projection purposes, especially rLCD projectors. The inventive glasses are glasses from the heavy flint-glass and lanthane heavy flint glass type and have a stress-optical coefficient approaching zero while having a good chemical resistance and sufficient Knoop hardness and are characterized by excellent melting and workability properties. They are therefore suitable for use in fields of application that benefit from low stress-optical effects.

Abstract: The invention describes a method and an apparatus for the rapid melting of in particular high-purity, aggressive and/or high-melting glasses in a skull crucible, in which high-frequency energy is introduced into the contents of the crucible by means of a coil arrangement surrounding the skull crucible, in order to heat the melt, and the batch is laid and the molten glass discharged in the upper region of the crucible, and undissolved constituents of the batch are retained by means of a cooled bridge which is immersed in the melt. According to the invention, the glass is taken off above the coil arrangement (1.3) and is fed for further processing without flowing through the coil region. This has the advantage that simple, conventional components can be used to connect the melting unit to the further-processing stations, and the type of connection can be selected in such a way that it is possible to prevent the quality of the glass from being impaired by connection techniques which are less than optimum.

Abstract: An optical and ophthalmic glass with high refractive index, high Abbe number and low density, which is distinguished by good chemical stability, good crystallization behavior and capability of chemical hardening, comprises (in % by weight):______________________________________ SiO.sub.2 50-63 B.sub.2 O.sub.3 4-8 Al.sub.2 O.sub.3 1-2 Li.sub.2 O 4-8 Na.sub.2 O 4-8 K.sub.2 O 3-7 sum of M.sub.2 O 11-20 (M = Li, Na, K) MgO 0.5-2 CaO 2-5 sum of MO 0-3 (M = Mg, Ca) TiO.sub.2 8-12.5 ZrO.sub.2 1-3 F.sup.- 0-1 As.sub.2 O.sub.3 0.05-0.15 (optional refining agent) Sb.sub.2 O.sub.3 0.0-0.

Abstract: Optical glass compositions having refractive indexes of 1.60-1.69 and Abbe numbers higher than 54 as well as with a density of less than 3.4 g/cm.sup.3, and which are distinguished in that they have good chemical stability, comprising (in percent by weight): 5-30 percent SiO.sub.2 ; 20-55 percent B.sub.2 O.sub.3 ; 13-40 percent CaO; 3-25 percent La.sub.2 O.sub.3 ; and optionally one or more of the following: up to 7 percent ZrO.sub.2, up to 2 percent TiO.sub.2, up to 9 percent Al.sub.2 O.sub.3, up to 11 percent MgO, up to 10 percent ZnO, up to 10 percent SrO, and up to 12 percent BaO.

Abstract: Optical glass with refractive indicies.gtoreq.1.90, Abbe numbers.gtoreq.25 consisting essentially of, in weight percent; 0-10 SiO.sub.2, 2-20 B.sub.2 O.sub.3, 0-2 Al.sub.2 O.sub.3, the sum of SiO.sub.2, B.sub.2 O.sub.3, and Al.sub.2 O.sub.3 being 7.5-25, 1-16 TiO.sub.2, 0-10 ZrO.sub.2, 35-55 La.sub.2 O.sub.3, 0.5-10 Y.sub.2 O.sub.5, 0.5-15 Nb.sub.2 O.sub.5, 0-10 Gd.sub.2 O.sub.3, 0-15 Ta.sub.2 O.sub.5, 0-3 P.sub.2 O.sub.5 wherein the ratio of SiO.sub.2 to B.sub.2 O.sub.3 is between 0.1 and 1.6, and the sum of Nb.sub.2 O.sub.5 and Ta.sub.2 O.sub.5 is from 9 to 20%.

Abstract: An optical and ophthalmic glass with high refractive index, high Abbe number and low density, which is distinguished by good chemical stability, good crystallization behavior and capability for chemical hardening, comprises (in % by weight):SiO.sub.2 --47 to 75B.sub.2 O.sub.3 --1 to 20Al.sub.2 O.sub.3 --0 to 10P.sub.2 O.sub.5 --0 to 5Li.sub.2 O--0 to 15Na.sub.2 O--0 to 10K.sub.2 O--0 to 10CaO--0 to 20MgO--0 to 15SrO--0 to 4BaO--0 to 4ZnO--0 to 5TiO.sub.2 --1 to 15ZrO.sub.2 --0 to 8Nb.sub.2 O.sub.5 --0 to 5 andF----0 to 5.

Abstract: An optical glass with the familiar optical position of n.sub.d >1.70 and v.sub.d >22, which differs from the familiar optical glasses of the optical position due to its lower density and good chemical stability, and is composed of (in percent by weight): SiO.sub.2 25-42, TiO.sub.2 15-35, B.sub.2 O.sub.3 0.5-7, BaO 3-13, CaO 1-3, Nb.sub.2 O.sub.5 1-20, GeO.sub.2 0-2, Al.sub.2 O.sub.3 0-4, Na.sub.2 O 7.5-15, Li.sub.2 O 0-9, K.sub.2 O 2-10, SrO 0-6, ZnO 0-5, ZrO.sub.2 0-3, and WO.sub.3 0-3.

Abstract: These objects have been attained by providing highly absorbent lead containing alkali metal silicate glasses for cathode ray tube image screens, having a linear absorption coefficient .mu. of >30 cm.sup.-1 (0.6 .ANG.) and with a high resistance to discoloration by X-ray and electron radiation, comprises, in weight percent:______________________________________ SiO.sub.2 20-65% P.sub.2 O.sub.5 + B.sub.2 O.sub.3 + Al.sub.2 O.sub.3 0-30% Li.sub.2 O 0-5% Na.sub.2 O 0-10% K.sub.2 O 0-15% MgO + CaO + ZnO 0-15% SrO 0-20% BaO 0-40% PbO 5-60% ZrO.sub.2 0-10% CeO.sub.2 0.1-5% Other Components 0-20%.

Abstract: Highly refractive, ThO.sub.2 -free optical glasses having refractive indices of 1.86-1.94 and Abbe-index numbers greater than or equal to 30, comprise:______________________________________ B.sub.2 O.sub.3 17-24 SiO.sub.2 0.5-6 B.sub.2 O.sub.3 + SiO.sub.2 19-27 La.sub.2 O.sub.3 40.1-51 ZrO.sub.2 5-9 Nb.sub.2 O.sub.5 0.5-25 Ta.sub.2 O.sub.5 0-27 Nb.sub.2 O.sub.5 + Ta.sub.2 O.sub.5 14-27 TiO.sub.2 0-8 PbO 0-12 ZnO 0-4 Al.sub.2 O.sub.

Abstract: CdO- and ThO-free, highly refractive optical glass having a refractive index of 1.85-2.05 and an Abbe index of 25-43, characterized by the following composition (in percent by weight):______________________________________ SiO.sub.2 5-15 B.sub.2 O.sub.3 2.5-8 SiO.sub.2 + B.sub.2 O.sub.3 7-23 SiO.sub.2 /B.sub.2 O.sub.3 1.3-2.1 La.sub.2 O.sub.3 43-56 Gd.sub.2 O.sub.3 0-14 La.sub.2 O.sub.3 + Gd.sub.2 O.sub.3 43-60 ZrO.sub.2 3-10 Nb.sub.2 O.sub.5 0-15 Ta.sub.2 O.sub.5 0-20 Nb.sub.2 O.sub.5 + Ta.sub.2 O.sub.