FLUORESCENT LAMP, HAVING GLASS-CERAMIC COMPOSITE CATHODE Russian patent published in 2012 - IPC H01J61/06 

FIELD: physics.

SUBSTANCE: fluorescent lamp includes a glass tube containing a luminophore deposited on its inner surface and filled with an inert gas and metal vapour mixture, both ends of which are sealed, hollow cylindrical electrodes at both ends of the glass tube, wherein each hollow cylindrical electrode has a stepped portion between its central part and its end part and is made of a glass-ceramic composite. The electrode material is a composite with the ceramic composition CaO-MgO-SrO-ZrO₂-TiO₂ and glass frit. CaO-MgO-SrO-ZrO₂-TiO₂ contains CaO in the range of 0<CaO<1 mol, MgO in the range of 0<MgO<1 mol, SrO in the range of 0<SrO<1 mol, ZrO₂ in the range of 0<ZrO₂<1 mol and TiO₂ in the range of 0<TiO₂<1 mol, in which CaO+MgO+SrO:ZrO₂+TiO₂ and has molar ratio 1:1, and additionally contains one or more substance selected from a group consisting of MnO, Al₂O₃, Cr₂O₃ and Fe₂O₃, in amount of 3 wt %.

EFFECT: higher brightness, possibility of controlling coefficient of thermal expansion and shorter electrode length inside the lamp.

10 cl, 8 dwg, 8 tbl