High-pressure discharge lamp

Abstract

The invention relates to a high-pressure discharge lamp having an ignition assisting layer (107, 107') disposed on the discharge vessel (10). According to the invention, the electrically conductive ignition assisting layer (107, 107') is made of at least one first layer segment (107) and one second layer segment (107'), wherein the first layer segment (107) is disposed on a first sealing end (101) of the discharge vessel (10) and extends to the surface of the area of the discharge vessel (10) enclosing the discharge chamber (106), and a wherein the second layer segment (107') is disposed on the second sealing end (102) of the discharge vessel (10) and extends to the surface of the area of the discharge vessel (10) enclosing the discharge chamber (106), so that the parts (107a, 107'a) of the first and second layer segments (107, 107'); disposed on the surface of the area of the discharge vessel (10) enclosing the discharge chamber (106) are disposed spaced apart from each other and the layer segments (107, 107') are galvanically separated.

Description

technical field [0001] The invention relates to a high-pressure discharge lamp according to the preamble of claim 1 . Background technique [0002] Such a high-pressure discharge lamp is known, for example, from EP 1 632 985 A1. Said reference describes a high-pressure discharge lamp for automotive headlamps having a light-transmissive discharge vessel which surrounds a discharge space and has two sealed ends; and has two An electrode into the discharge space and a filling arranged in the discharge space for generating a gas discharge, and a power feed leading out of the sealed end for supplying the electrodes. An electrically conductive layer serving as an ignition aid is arranged on the surface of the discharge vessel. The ignition aid layer is formed in one piece. The ignition aid layer extends over the entire longitudinal extent of the discharge space and, according to a symmetrical embodiment, over both sealed ends of the discharge vessel and, according to an asymmet...

AI Technical Summary

Problems solved by technology

[0003] The one-piece ignition aid has the disadvantage that the ignition aid cannot be combined with an auxiliary arrester serving as an additional ignition aid in the outer bulb of the high-pressure discharge lamp because the ignition aid For this auxiliary discharger is an electrical short circuit along the discharge vessel

The symmetrical embodiment of the one-piece ignition aid has the further disadvantage that the electric field is distributed symmetrically between the ignition aid and the two electrodes due to its capacitive coupling to the two electrodes, so that at each Only half of the field strength above an electrode is usable

On the other hand, the asymmetric embodiment of the one-piece ignition aid layer according to the prior art has the further disadvantage that the efficiency of the ignition aid layer depends on the polarity of the half-wave of the ignition voltage pulse and on the Which of the two electrodes is charged with the "hot" potential of the ignition voltage pulse, i.e. with a high potential compared to ground potential

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