US 8,264,136 B2Granted

Fluorescent lamp having ceramic-glass composite electrode

AssigneesInova Ltd., Santoma Ltd.

InventorMan Sun Yun

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Abstract

Disclosed is a fluorescent lamp having ceramic-glass composite electrodes, which has a higher dielectric constant, higher secondary electron emission, and higher polarization under the same electric field, and thus enables the movement of many more electrons and cations, resulting in high brightness. The fluorescent lamp having ceramic-glass composite electrodes includes a glass tube, which has a phosphor applied on the 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, each of the hollow cylindrical electrodes having a stepped portion between a central portion thereof and an end portion thereof, and being formed of a ceramic-glass composite. As the material for the electrode, a composite, including a CaO—MgO—SrO—ZrO2—TiO2 ceramic composition and glass frit, is used.

Claims10

Dependent claims

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—ZrO2—TiO2 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—ZrO2—TiO2 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, ZrO2 in a range of 0<ZrO2<1 mol, and TiO2 in a range of 0<TiO2<1 mol, in which CaO+MgO+SrO:ZrO2+TiO2 has a molar ratio of 1:1, and further comprise one or more selected from a group consisting of MnO, Al2O3, Cr2O3, and Fe2O3, by 3 wt % or less based on a total amount thereof.

Dependencies are inferred from the claim text.