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US 8,710,743 B2Granted
Discharge lamp comprising coated electrode
AssigneeOSRAM GmbH
InventorBernhard Winzek
Life of this patent
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Abstract
A discharge lamp (1) comprising a discharge vessel (4), at least one electrode (22, 24) arranged within the discharge vessel, wherein at least parts of the electrode (22) are provided with a particle composite coating (32) made up of a matrix layer and particles embedded in the matrix layer, wherein the extinction coefficient k of the material for the matrix layer is less than 0.1 in the spectral range between 600 nm and 2 μm, and wherein the extinction coefficient k of the material for the particles is greater than 0.1 in the spectral range between 600 nm and 2 μm.
Claims10
A discharge lamp comprising:
- a discharge vessel;
- and
- at least an anode arranged within the discharge vessel,
- wherein at least parts of the anode are provided with a particle composite coating comprising a matrix layer and tungsten particles embedded in the matrix layer,
- wherein the proportion by volume of the tungsten particles lies in the range between 2 and 50%,
- wherein the extinction coefficient k of the material for the matrix layer is less than 0.1 in the spectral range between 600 nm and 2 μm,
- wherein the extinction coefficient k of the material for the particles is greater than 0.1 in the spectral range between 600 nm and 2 μm, and
- wherein the discharge lamp is a short-arc discharge lamp configured for direct current (DC) operation.
5 more elements
Dependencies are inferred from the claim text.