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US 4,777,399 AGranted
High pressure metal vapor discharge lamp
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorsKouichi Miyazaki, Akihiro Kamiya, Akihiro Inoue
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Abstract
A high pressure metal vapor discharge lamp comprising a discharge tube with a pair of spaced main electrodes; a filling sealed in the discharge tube comprising a light emitting metal and a starting gas; a radioactive source comprising a radioactive substance entirely covered with an envelope of non-radioactive, heat- and corrosion-resistant material sealed inside the discharge tube, an outer tube enclosing the discharge tube, and circuit means for starting the discharge tube.
Claims20
A high pressure metal vapor discharge lamp, comprising:
- a discharge tube having a pair of spaced main electrodes;
- a filling comprising a light emitting metal and a starting gas sealed in said discharge tube;
- a radioactive source sealed inside said discharge tube, said source comprising a ceramic body impregnated with a radioactive substance and entirely covered with an envelope of non-radioactive, heat- and corrosion-resistant material sealed in said discharge tube;
- an outer tube enclosing said discharge tube;
- and
- electrical circuit means for starting said discharge tube.
3 more elements
Dependencies are inferred from the claim text.