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US 7,352,132 B2Granted
Metal halide lamp and metal halide lamp lighting device with improved emission power maintenance ratio
AssigneeHarison Toshiba Lighting Corp.
InventorsToshihiko Ishigami, Mikio Matsuda, Toshio Hiruta
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Abstract
A metal halide lamp includes a refractory, light-transmitting hermetic vessel, a pair of electrodes sealed in thehermetic vessel, a discharge medium including a halide and a rare gas, and metal storing means storing at least one selected from the group consisting of potassium (K), rubidium (Rb) and cesium (Cs), the metal storing means being heated during lighting and gradually discharging at least one metal in the hermetic vessel.
Claims25
A metal halide lamp comprising:
- a refractory, light-transmitting hermetic vessel;
- a pair of electrodes sealed in the hermetic vessel;
- a discharge medium including a halide and a rare gas;
- and
- metal storing means storing at least one selected from the group consisting of potassium (K), rubidium (Rb) and cesium (Cs), the metal storing means being heated during lighting and gradually discharging the at least one metal in the hermetic vessel,
- wherein an emission power ratio of visible light with wavelengths of 380 to 780 nm to near-infrared light with wavelengths of 750 to 1100 nm is 0.5:1 to 4.0:1 during stable lighting, and
- wherein the halide of the discharge medium contains a halide of at least one selected from the group consisting of potassium (k), rubidium (RB) and cesium (Cs).
4 more elements
A metal halide lamp comprising:
- a refractory, light-transmitting hermetic vessel;
- a pair of electrodes sealed in the hermetic vessel;
- a discharge medium including a halide and a rare gas;
- and
- metal storing means storing at least one selected from the group consisting of potassium (K), rubidium (Rb) and cesium (Cs), the metal storing means being heated during lighting and gradually discharging the at least one metal in the hermetic vessel,
- wherein an emission power ratio of visible light with wavelengths of 380 to 780 nm to near-infrared light with wavelengths of 750 to 1100 nm is 0.5:1 to 4.0:1 during stable lighting, and
- wherein the halide of the discharge medium contains a first halide including a halide of at least one selected from the group consisting of sodium (Na), scandium (Sc) and a rare earth metal, the halide also containing a second halide including a halide of at least one selected from the group consisting potassium (K), rubidium (Rb) and cesium (Cs), the halide further containing a third halide having a relative high vapor pressure and being a halide of at least one kind of metal that emits a visible light less than that emitted by the metal of the first halide, the discharge medium containing substantially no mercury.
4 more elements
A metal halide lamp comprising:
- a refractory, light-transmitting hermetic vessel;
- a pair of electrodes sealed in the hermetic vessel;
- a discharge medium including a halide and a rare gas;
- and
- metal storing means storing at least one selected from the group consisting of potassium (K), rubidium (Rb) and cesium (Cs), the metal storing means being heated during lighting and gradually discharging at least one metal in the hermetic vessel,
- wherein an emission power ratio of visible light with wavelengths of 380 to 780 nm to near-infrared light with wavelengths of 780 to 1200 nm is 2.0:1 to 3.2:1 during stable lighting, and
- wherein the halide of the discharge medium contains a halide of at least one selected from the group consisting of potassium (K), rubidium (Rb) and cesium (Cs).
4 more elements
A metal halide lamp comprising:
- a refractory, light-transmitting hermetic vessel;
- a pair of electrodes sealed in the hermetic vessel;
- a discharge medium including a halide and a rare gas;
- and
- metal storing means storing at least one selected from the group consisting of potassium (K), rubidium (Rb) and cesium (Cs), the metal storing means being heated during lighting and gradually discharging at least one metal in the hermetic vessel,
- wherein an emission power ratio of visible light with wavelengths of 380 to 780 nm to nearinfrared light with wavelengths of 780 to 1200 nm is 2.0:1 to 3.2:1 during stable lighting, and
- wherein the halide of the discharge medium contains a first halide including a halide of at least one selected from the group consisting of sodium (Na), scandium (Sc) and a rare earth metal, the halide also containing a second halide including a halide of at least one selected from the group consisting potassium (K), rubidium (Rb) and cesium (Cs), the halide further containing a third halide having a relatively high vapor pressure and being a halide of at least one kind of metal that emits a visible light less than that emitted by the metal of the first halide, the discharge medium containing substantially no mercury.
4 more elements
Dependencies are inferred from the claim text.