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US 5,965,984 AGranted
Indium halide and rare earth metal halide lamp
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMakoto Horiuchi, Kiyoshi Takahashi, Mamoru Takeda
Life of this patent
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Abstract
A metal halide lamp includes a light transmitting container filled with a rare gas, a halide of indium in an amount of 0.1 mg/cc to 1.5 mg/cc, at least one halide of a rare earth element selected from terbium, dysprosium, holmium, erbium, or thulium. The metal halide lamp has an emission spectrum distributed over the visual inspection range, a high luminous efficacy, a high color temperature, and long lifetime.
Claims25
A metal halide lamp comprising
- a light transmitting container filled with a fill gas consisting essentially of:
- a) a start-up rare gas,
- b) at least one halide of indium, and
- c) one halide of a rare earth metal selected from the group consisting of terbium, dysprosium, holmium, erbium, thulium and mixtures thereof,
- wherein DyI.sub.3 is not present in said container, and
- wherein said halide of indium is present in an amount of 0.1 mg/cc to 1.5 mg/cc.
3 more elements
A metal halide lamp comprising
- a light transmitting container filled with a fill gas consisting essentially of:
- a) a start-up rare gas,
- b) at least one halide of indium,
- c) DyBr.sub.3 and one halide of a rare earth metal selected from the group consisting of terbium, holmium, erbium, thulium and mixtures thereof, or alternatively, DyBr.sub.3 or at least one halide of a rare earth metal selected from the group consisting of terbium, holmium, erbium, thulium and mixtures thereof,
- wherein said halide of indium is present in an amount of 0.1 mg/cc to 1.5 mg/cc.
2 more elements
Dependencies are inferred from the claim text.