Patent ID: 8264136

Claim:
A fluorescent lamp having ceramic-glass composite electrodes, comprising a glass tube, which has a phosphor applied on an inner surface thereof and is filled with a mixture of inert gas and metal vapor, both ends of which are sealed; and hollow cylindrical electrodes provided at both ends of the glass tube, wherein each of the hollow cylindrical electrodes has a stepped portion between a central portion thereof and an end portion thereof, and is formed of a composite of CaO—MgO—SrO—ZrO 2 —TiO 2 ceramics and glass frit in an amount of 0.3˜10 wt % based on a total amount of the ceramics, and the CaO—MgO—SrO—ZrO 2 —TiO 2 ceramics comprise CaO in a range of 0<CaO<1 mol, MgO in a range of 0<MgO<1 mol, SrO in a range of 0<SrO<1 mol, ZrO 2 in a range of 0<ZrO 2 <1 mol, and TiO 2 in a range of 0<TiO 2 <1 mol, in which CaO+MgO+SrO:ZrO 2 +TiO 2 has a molar ratio of 1:1, and further comprise one or more selected from a group consisting of MnO, Al 2 O 3 , Cr 2 O 3 , and Fe 2 O 3 , by 3 wt % or less based on a total amount thereof.