Schott Ag

Plansee Se

Brigitte Hueber

Franz Ott

Joerg Hinrich Fechner

Andreas Reisse

Gerhard Dipl-Ing Leichtfried

Jörg Hinrich Fechner

Wolfram Knabl

Ralf Diezel

Herman Walser

Juergen Achatz

The PbO-free UV-absorbing glass is made under oxidative conditions and has a composition, in % by weight, of: SiO, 55-79; BO, 3-25; AlO, 0-10; LiO, 0-10; NaO, 0-10; KO, 0-10; MgO, 0-2; CaO, 0-3; SrO, 0-3; BaO, 0-3; ZnO, 0-3; ZrO, 0-3; CeO, 0-1; FeO, 0-1; WO, 0-3; BiO, 0-3; MoO, 0-3; &#x3a3;LiO+NaO+KO=0.5 to 16 and &#x3a3;MgO+CaO+SrO+BaO+ZnO=0-10. It also contains from 0.1 to 10% TiOwith at least 95% of the titanium as Tiso that it has a high visible transmission, reduced color centers, and a sharp UV absorption edge. It is especially useful in lamps, display devices and glass-to-metal seals

UV-radiation absorbing glass with reduced absorption of visible light and method of making and using same

Glass for gas discharge tubes, which are used in fluorescent lamps, EEFL lamps, LCD displays, computer monitors, telephone displays and TFT displays, and a process for making it are described. The glass contains, in % by weight based on oxide content: SiO, 60-75; BO, &#x3e;25-35; AlO, 0-10; LiO, 0-10; NaO, 0-20; KO, 0-20; MgO, 0-8; CaO, 0-20; SrO, 0-5; BaO, 0-5; ZnO, 0-3; ZrO, 0-5; TiO, 0-10; FeO, 0-0.5; CeO0-0.5; MnO, 0-1.0; NdO, 0-1.0; WO, 0-2; BiO, 0-5; MoO, 0-5; AsO, 0-1; SbO, 0-1; SO, 0-2; Cl, 0-2 and F, 0-2, wherein &#x3a3;LiO+NaO+KO=0-25% by weight; &#x3a3;MgO+CaO+SrO+BaO=0-20; &#x3a3;FeO+CeO+TiO+PbO+AsO+SbOis at least 0-10; and &#x3a3;PdO+PtO+PtO+PtO+RhO+RhO+IrO+IrOis from 0.00001-0.1.

UV-absorbing borosilicate glass for a gas discharge lamp and process for manufacturing same

The lamp bulb for discharge lamps is made from an aluminosilicate glass with a transformation temperature Tg&#x3e;600&#xb0; C. The aluminosilicate glass has a composition (in % by weight, based on oxide content) of SiO&#x3e;55-64; AlO, 13-18; BO, 0-5.5; MgO, 0-7; CaO, 5-14; SrO, 0-8; BaO, 6-17; ZrO, 0-2; TiO, 0-5, but may contain small amounts of CeOand/or FeO, for anti-solarization and fining agents, such as SnO, SbOand/or AsO. The lamp bulbs for the discharge lamps of the invention may include a melted-in molybdenum electrode and/or an electrode feed or they may be free of any internal electrodes. A method for making the lamp bulbs is also described.

Lamp bulbs for discharge lamps made from aluminosilicate glass, discharge lamps made with same and method of making same

Glass for gas discharge tubes, which are used in fluorescent lamps, especially EEFL and miniaturized lamps, LCD displays, computer monitors, telephone displays and TFT displays, and a process for making it are described. The glass contains, in % by weight based on oxide content: SiO, 60-85; BO, 0-10; AlO, 0-10; LiO, 0-10; NaO, 0-20; KO, 0-20; MgO, 0-8; CaO, 0-20; SrO, 0-5; BaO, 0-5; ZnO, 0-8; ZrO, 0-5; TiO, 0-10; FeO, 0-5; CeO0-5; MnO, 0-5; NdO, 0-1.0; WO, 0-2; BiO, 0-5; MoO, 0-5; PbO, 0-5; AsO, 0-1; SbO, 0-1; SO, 0-2; Cl, 0-2 and F, 0-2, wherein &#x3a3; LiO+NaO+KO=5-25% by weight; &#x3a3; MgO+CaO+SrO+BaO=3-20; &#x3a3; FeO+CeO+TiO+PbO+AsO+SbOis at least 0-10; and &#x3a3; PdO+PtO+PtO+PtO+RhO+RhO+IrO+IrOis 0.1.

Glass for an EEFL fluorescent lamp, process for making the glass and devices including articles made with the glass

The chemically resistant borosilicate glass has the following composition (in % by weight): SiO, 67-74; BO, 5-10; AlO, 3-10; LiO, 0-4; NaO, 0-10; KO, 0-10; MgO, 0-2; CaO, 0-3; SrO, 0-3; BaO, 0-3; ZnO, 0-3; ZrO, 0-3; CeO, 0-1; with &#x3a3;LiO+NaO+KO=0.5 to 10.5 and &#x3a3;MgO+CaO+SrO+BaO+ZnO=0-6. The borosilicate glass is characterized by a composition including 0 to 10% of at least one of TiO, BiOand MoOand a sum total of TiO+BiO+MoOof 0.1 to 10%. This glass is obtained from the melt under oxidative conditions. The glass is useful in gas discharge lamps, such as Xenon lamps and fluorescent lamps, and display devices, flat structured backlighting devices, and glass-to-metal seals with Mo, Wo and Ni&#x2014;Fe&#x2014;Co alloys.

UV-radiation absorbing glass with high chemical resistance, especially for a fluorescent lamp, and methods of making and using same

A cold cathode fluorescent lamp () has feedthrough pins () made from molybdenum or a molybdenum alloy that form a glass-metal seal () with a glass composed of 55-75 wt. % SiO, 13-25 wt. % BO, 0-10 wt. % AlO, 5-12 wt. % alkali oxides, 0-3 wt. % alkali earth oxides, 0-5 wt. % ZrO, 0-10 wt. % TiOund 0-5 wt. % remaining oxides. The lamp has hollow cathodes () made from a material of the group molybdenum, molybdenum alloys, niobium, niobium alloys, and the lamp is manufactured in a compact form using conventional manufacturing parameters, and the resulting lamp has crack free, long-term vacuum-tight glass-metal seals.

Cold cathode fluorescent lamp with molybdenum electrode

The method for making UV-absorbing glass, which transmits in a visible range, includes melting raw materials to form a melt and producing the melt under oxidative conditions. The UV-absorbing glass is free of PbO and has the following composition (in % by weight): SiO, 55-79; BO, 3-25; AlO, 0-10; LiO, 0-10; NaO, 0-10; KO, 0-10; MgO, 0-2; CaO, 0-3; SrO, 0-3; BaO, 0-3; ZnO, 0-3; ZrO, 0-3; CeO, 0-1; FeO, 0-1; WO, 0-3; BiO, 0-3; MoO, 0-3; with &#x3a3; LiO+NaO+KO=0.5 to 16 and &#x3a3; MgO+CaO+SrO+BaO+ZnO=0-10. The melt composition is characterized by including 0.1 to 10 % TiOand from 0.01-10 % AsO. The glass made by the method and its properties are also disclosed. The glass is useful in lamps, LCD displays, monitors and glass-to-metal seals with molybdenum, tungsten and Fe&#x2014;Co&#x2014;Ni alloys.

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Weiden, Germany

Brigitte Hueber