Fluorescent lamp with phosphor having coated phosphor particles
 A fluorescent lamp characterized in that the charging tendency of a phosphor used is positioned more negative side than that of metal oxides each having a metal ion electronegativity X.sub.i of 7.0 but more positive side than that of metal oxides each having a metal ion electronegativity X.sub.i of 11.8, that particles of the phosphor are charged positive and smaller than 3.0 .mu.C per gram when they are in contact with soda lime glass beads each having a particle size of 200-500 .mu.m, or that they are charged negative and larger than -0.5 .mu.C per gram when they are in contact with reduced iron powder having a particle size of 44-74 .mu.m. 
Kabushiki Kaisha Toshiba Toshiba Lighting & Technology Corporation
C H H
C09K H01J H01J
inventional inventional inventional
Kazuaki Kenji Akira Masaaki Hidenori Shigeru Yoji
Nakagawa Terashima Taya Tamatani Ito Ando Yuge