Matsushita Electronics Corporation

Naoki Saito

Hidezo Akutsu

Haruo Yamazaki

Takio Okamoto

Katsuaki Iwama

Tamisuke Atsumi

Yoshichika Kobayashi

Masanori Takagawa

Yoshiaki Watarai

Masayuki Yamaguchi

A high pressure sodium vapor discharge lamp comprises an alumina tube envelope containing therein sodium, inert starting gas, buffer gas source of mercury or cadmium and discharge electrodes sealed in the envelope, inner diameter d (in mm) of said tube envelope and an average potential gradient E in volt/cm having the relation

High pressure sodium vapor discharge lamp

A high pressure mercury vapor lamp having an outer bulb with a plural-phosphor coating on the inside surface thereof. A first phosphor provides for emission peaks within the range of wavelengths between 440 and 540 nm and contains strontium chloroapatite, barium magnesium aluminate, strontium chlorosilicate, barium magnesium aluminate, or barium strontium silicate, each activated with di-valent europium. A second phosphor includes yttruim vanaphosphate activated with tri-valent europium which has emission peaks between 600 and 720 nm.

High-pressure mercury-vapor lamp having a plural phosphor coating

Growing community of inventors

Osaka, Japan

Naoki Saito