Ushio Denki Kabushiki Kaisha

Kunihiro Noguchi

Mitsuo Narita

Masachika Ohyama

A metal vapor discharge lamp includes a light-emitting tubing in which a halogen and iron at least 0.005 mg per cc of the internal volume of the light-emitting tubing are filled together with mercury and a rare gas in amounts sufficient to retain a discharge. Magnesium is additionally filled in at a magnesium-to-iron ratio of 1/40-2/3 in terms of gram atom number so as to prevent iron from depositing on the inner wall of the light-emitting tubing and forming a thin film thereon.

Metal vapor discharge lamp

A magnesium vapor discharge lamp includes a light-emitting tubing in which magnesium and a halogen are sealed as light-emitting substances together with mercury and a rare gas in amounts sufficient to retain a discharge. Iron is additionally sealed within the light-emitting tubing.

Growing community of inventors

Himeji, Japan

Kunihiro Noguchi