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US 2009/0267475 A1Published application
High-pressure gas discharge lamp
AssigneeKoninklijke Philips Electronics N.V.
InventorsArnd Ritz, Jsoephus Christiaan Maria Hendricx
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AssigneeKoninklijke Philips Electronics N.V.
InventorsArnd Ritz, Jsoephus Christiaan Maria Hendricx
Estimating the term…
The invention relates to a high-pressure gas discharge lamp, which has at least a burner or an inner lamp envelope whose wall mainly consists of a ceramic material, namely a polycrystalline aluminum oxide material (PCA), YbAG- or YAG-material, and at least an interference filter is arranged on at least part of the surface of this wall, wherein this interference filter consists of several layers and in whose layer structure a layer with a higher refractive index alternates with a layer with a lower refractive index, the layer with a lower refractive index mainly consists of Al2O3 and with operation of the lamp the maximum temperature of the wall is more than 1400K.
A high-pressure gas discharge lamp, which has at least a burner or an inner lamp envelope (1) whose wall mainly consists of ceramic material, namely a polycrystalline aluminum oxide material (PCA), YbAG- or YAG-material, and at least an interference filter (3) is arranged on at least part of the surface of this wall, wherein this interference filter (3) consists of a plurality of layers and in its layer structure a layer (3.1) with a higher refractive index alternates with a layer (3.2) with a lower refractive index, the layer (3.2) with a lower refractive index mainly consists of Al2O3 and with operation of the lamp the maximum temperature of the wall is more than 1400K.
Dependencies are inferred from the claim text.