Metal halide lamp with ceramic discharge vessel
AssigneePatent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH
InventorDieter Trypke
Life of this patent
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Abstract
Metal halide lamp with ceramic discharge vessel (4), the discharge vessel having two ends (6) which are closed off by stoppers, and an electrically conductive leadthrough (9) being passed through this stopper (12), an electrode (15) having a shank (16), which projects into the interior of the discharge vessel, being secured to the leadthrough. The leadthrough is composed of two portions of different diameters, with the outer portion resting on the end face of the stopper.
Claims5
A metal halide lamp with a ceramic discharge vessel, the discharge vessel having two ends, which if appropriate are closed off by stoppers, and an electrically conductive leadthrough being passed through a hole in these ends, an electrode with a shank being secured to the leadthrough, which electrode projects into the interior of the discharge vessel, with the leadthrough and electrode together being referred to as the electrode system, wherein the leadthrough comprises two portions, which are designed as cylindrical pins of different diameters, the portion which lies on the inside with respect to the discharge having an external diameter which is at least 10 μm smaller than the diameter of the hole, and the portion which lies on the outside having a diameter which is slightly larger, in particular 5 to 20 μm larger, than the diameter of the hole, with the step between the two portions serving as a stop for the leadthrough at the end face of the capillary.
A process for producing a ceramic discharge vessel, comprising the following steps:
- a) providing a discharge vessel which has an open capillary;
- b) providing an electrode system which has a leadthrough comprising two portions of different diameters, the portion which lies on the inside with respect to the discharge having an external diameter which is at least 10 μm smaller than the diameter of the hole, and the portion which lies on the outside having a diameter which is slightly larger, in particular 5 to 20 μm larger, than the diameter of the hole;
- c) either pushing a ring of soldering glass onto the narrower portion of the electrode system, in which case the wider portion serves as a stop;
- or placing a soldering-glass ring directly onto the upper end face of the capillary;
- d) introducing the electrode system into the capillary hole, with the soldering-glass ring resting on the end face of the capillary;
- e) heating the soldering-glass ring, so that some of the soldering glass runs into the capillary, thereby effecting sealing.
Dependencies are inferred from the claim text.