Kabushiki Kaisha Toshiba

Toshiba Lighting & Technology Corporation

Youichiro Mitsuyuki

Hiroki Sasaki

Kazuo Honda

Hiromichi Kawashima

Yasuki Mori

Akihiro Yonezawa

Takahiro Sugimoto

Mamoru Furuya

Masakazu Shibuya

A prescribed amount of tin halide is sealed in the arc tube of a metal halide lamp wherein a given amount of metal halide including a target amount of halogen and at least a predetermined amount of rare earth metal is sealed in the arc tube thereof to maintain a high lumen maintenance factor for an extended operation period. The prescribed amount of tin halide is preferably within 4.6.about.234 mol % of the predetermined amount of rare earth metal.

Metal halide lamp maintaining a high lumen maintenance factor over an

A high-efficacy, high power ultraviolet radiation lamp is disclosed. Electrodes are respectively provided at two ends of a discharge tube, and at least a rare gas is sealed in the discharge tube. The discharge tube is curved in a U shape. A reservoir for reserving a radiant material for radiating ultraviolet rays projects from the discharge tube. An isolating section is provided to surround at least the reservoir. The isolating section adjusts the temperature of the reservoir and supplies an appropriate amount of radiant material into the discharge tube.

Lamp for generating ultraviolet radiation

Growing community of inventors

Tokyo, Japan

Youichiro Mitsuyuki