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US 8,283,863 B2Granted
Xenon short arc lamp for digital a projector
AssigneeUshio Denki Kabushiki Kaisha
InventorsShunichi Morimoto, Tetsuya Kitagawa, Akiko Uchino, Tomoyoshi Arimoto
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Abstract
A xenon short arc lamp for a digital projector, includes an anode, a cathode having a cathode main body that is made of tungsten containing electron emissive material, and an arc tube made of silica glass, wherein a supply source of carbon is formed on a metal portion in the arc tube except a tip area of the cathode, and the carbon is supplied to the tip of the cathode through a gaseous phase during lamp lighting, so that a surface layer of the cathode is melt.
Claims13
A xenon short arc lamp, comprising:
- an anode;
- a cathode having a cathode main body which is made of tungsten containing electron emissive material;
- and
- an arc tube made of silica glass,
- wherein a supply source of carbon is formed on a metal portion in the arc tube except a tip area of the cathode;
- wherein in the arc tube, carbon and/or carbide of 2.4 μmol/cm3 or more per unit internal volume of the arc tube when converted into carbon (C), is contained.
3 more elements
A xenon short arc lamp comprising:
- an anode;
- a cathode having a cathode main body which is made of tungsten containing electron emissive material;
- and
- an arc tube made of silica glass,
- wherein a surface layer of a tip face of the cathode has stripe phases of tungsten carbide in a phase of tungsten (W);
- wherein in the arc tube, carbon and/or carbide of 2.4 μmol/cm3 or more in an arc tube volume when converted into carbon (C), is contained.
3 more elements
Dependencies are inferred from the claim text.