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US 2009/0021172 A1Published application
High-Pressure Discharge Lamp Having a Ceramic Discharge Vessel
AssigneeOSRAM GmbH
InventorsWolfram Graser, Dieter Trypke
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AssigneeOSRAM GmbH
InventorsWolfram Graser, Dieter Trypke
Estimating the term…
High-pressure discharge lamp having a ceramic discharge vessel, in which two electrodes and a light-emitting filling are contained, wherein capillaries are positioned at the ends of the discharge vessel, in which capillaries leadthroughs are sealed off, which leadthroughs are each connected to an electrode (15) consisting of tungsten. The electrode (15) is in the form of a pin and integrally comprises two parts (25, 26) having different diameters, wherein the first part (25) having a given diameter D1 forms the electrode tip, the second part (26) having a diameter D2 is positioned in the capillary, and the diameter D2 of the second part makes up at least 108% of the diameter D1 of the first part. The total length L of the electrode (15) is split between the first part (25) with a partial length L1 and the second part (26) with a partial length L2 such that L2 makes up approximately 30 to 70% of the total length L, wherein the beginning of the maximum diameter D2 coincides with the beginning of the capillary or deviates therefrom by a maximum of 10% of the length L.
A high-pressure discharge lamp having a ceramic discharge vessel, in which two electrodes and a light-producing filling are contained, capillaries resting at the ends of the discharge vessel, in which capillaries leadthroughs are sealed off, which leadthroughs are each connected to an electrode made from tungsten, rhenium or a mixture or alloy of the two elements, possibly with an addition of conventional dopings, characterized in that the electrode is in the form of a pin and integrally comprises two parts with different diameters, the first part with a given diameter D1 forming the electrode tip, and the second part with a diameter D2 resting in the capillary, the diameter D2 of the second part making up at least 108% of the diameter of the first part, the total length L of the electrode thus being split between the first part with a part length L1 and the second part with a part length L2, with L2 making up approximately 30 to 70% of the total length L, and the beginning of the maximum diameter D2 coinciding with the beginning of the capillary or deviating from this by a maximum of 10% of the length L.
A high-pressure discharge lamp, in which the electrode material is doped with at least one of the elements K, Al, Si, Y.
Dependencies are inferred from the claim text.