Metal halide lamp with ceramic discharge vessel
AssigneePatent-Treuhand-Gesellschaft F. Elektrische Gluehlampen mbH
InventorsUwe Fidler, Karen Twesten
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Abstract
A metal halide lamp has a ceramic discharge vessel with two ends (5) which are closed off by sealing means which enclose a capillary tube (11). An electrically conductive lead-through (9) is passed in a vacuum-tight manner through a bore in the capillary tube (11). The capillary tube (11) comprises two sections (20, 21) which are arranged axially one behind the other, the diameter of the bore of the inner section amounting to at most 90% of the diameter of the bore in the outer section.
Claims10
Metal halide lamp with ceramic discharge vessel (4), the discharge vessel having two ends (5) which are closed off by sealing means which at least at one end comprise a capillary tube (11), an electrically conductive lead-through (9) being passed in a vacuum-tight manner through a bore in this capillary tube (11), to which lead-through an electrode (14) with a shank (15) is attached, which electrode projects into the interior of the discharge vessel, characterized in that the capillary tube (11) comprises two sections (20, 21) which are arranged axially one behind the other, the diameter of the bore of the inner section (21) amounting to at most 92% of the diameter of the bore in the outer section (20), and in that the lead-through (9) comprises two parts (17, 18) which lie axially one behind the other and are associated with the two sections (20, 21).
Dependencies are inferred from the claim text.