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US 4,445,067 AGranted
High pressure metal vapor discharge lamp with radioactive material impregnated in ceramic
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorsAkihiro Inoue, Tadao Kanoh, Taketo Kamei, Akihiro Kamiya, Toshihiko Ishigami, Akira Kohno, Hiroki Sasaki
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Abstract
A high pressure metal vapor discharge lamp including an arc tube having opposed ends at which are provided respective main electrodes and a fill including mercury and a starting gas, a radioactive source material including a radioactive substance having a half-life less than 1.times.10.sup.4 years sealed in the arc tube, an outer tube enclosing the arc tube and a circuit for starting the arc tube.
Claims2
A high pressure metal vapor discharge lamp comprising:
- an arc tube having a pair of main electrodes mounted at opposed ends of the arc tube, said arc tube provided with a fill including mercury and a starting gas;
- a radioactive source material including a ceramic material impregnated with a radioactive substance having a half-life less than 1.times.10.sup.4 years sealed in said arc tube;
- an outer tube enclosing said arc tube;
- and
- a circuit for starting said arc tube.
2 more elements
Dependencies are inferred from the claim text.