Ceramic discharge vessel and related lamp and method of manufacturing such a vessel
AssigneeOSRAM GmbH
InventorsChad Coughlin, Thomas Wichmann
Life of this patent
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Abstract
A ceramic discharge vessel for discharge lamps is provided, with a central main part which extends between the tips of two electrodes and which is essentially tubular and with two ends for fixing and sealing an electrode system, wherein the ceramic discharge vessel has a longitudinal axis and wherein the main part consists of two halves which are connected in the middle of the main part wherein the two halves are frustoconically shaped with a draft angle p of 0.5°≦p≦7.0°.
Claims11
A ceramic discharge vessel for discharge lamps, with a central main part which extends between the tips of two electrodes and which is essentially tubular and with two ends for fixing and sealing an electrode system, wherein the ceramic discharge vessel has a longitudinal axis and wherein the main part consists of two halves which are connected in the middle of the main part wherein the two halves are frustoconically shaped with a draft angle p of 0.5°≦p≦7.0°.
A high pressure discharge lamp with a ceramic discharge vessel, with a central main part which extends between the tips of two electrodes and which is essentially tubular and with two ends for fixing and sealing an electrode system, wherein the vessel has a longitudinal axis and wherein the main part consists of two halves which are connected in the middle of the main part wherein the two halves are frustoconically shaped with a draft angle p of 0.5°≦p≦7.0°.
A method of manufacturing a ceramic discharge vessel, with a central main part which extends between the tips of two electrodes and which is essentially tubular and with two ends for fixing and sealing an electrode system, wherein the vessel has a longitudinal axis and wherein the main part consists of two halves which are connected in the middle of the main part wherein the two halves are frustoconically shaped with a draft angle p of 0.5°≦p≦7.0°, the method comprising:
- forming two halves from ceramic material in a green state having a frustoconical shape;
- joining the two halves at the base line of the truncated cone;
- inserting the electrode systems into the ends of the vessel;
- and
- applying an outer tube to the vessel.
Dependencies are inferred from the claim text.