Toshiba Lighting & Technology Corporation

Kabushiki Kaisha Toshiba

Hidenori Ito

Masaaki Tamatani

Shigeru Ando

Yusuke Shibahara

Kazuaki Nakagawa

Takeo Yasuda

Akihiro Inoue

Akira Taya

Hitoshi Imamura

Fuminori Nakaya

Takayuki Fujita

Toshiyuki Ikeda

Kenji Terashima

Yoji Yuge

Junji Hasegawa

Mamoru Ikeda

Fluorescent lamp with auxiliary amalgam secured to single lead wire

A low pressure mercury vapor discharge lamp is operated at a power more than 550 W/m.sup.2. The lamp has a first layer comprising first grains coated on the inner surface of the tube thereof and a second layer comprising second grains coated on the first layer. The second grains are more positive in contact electrification than the first grains. The lamp reduces an early decrease in luminous flux.

Low pressure mercury vapor discharge lamp having double layers

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.

Fluorescent lamp with phosphor having coated phosphor particles

A fluorescent lamp device includes a main body having a base, and a fluorescent lamp supported by the main body and electrically connected to the base. The lamp has a plurality of U-shaped glass tubes which define a zigzagging discharge channel. Each glass tube is provided with a pair of straight portions, each of which has a flat cross section.

Fluorescent lamp device having oval cross sectional tubes

Growing community of inventors

Kanagawa-ken, Japan

Hidenori Ito