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Electrode for a discharge lamp and a method for producing such an electrode

A technology for discharge lamps and high-pressure discharge lamps, which is applied in the field of electrodes, can solve problems such as troublesome manufacturing and bonding, troublesome connection, and start-up of discharge lamps, and achieve the effect of simplifying manufacturing

Inactive Publication Date: 2009-06-03
OSRAM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two parts 11' and 12' of the cathode 1' are relatively complicated to connect, wherein for example welding or screw joints are provided for this purpose
In addition to this relatively complex production and bonding, starting problems of the discharge lamp arise in cathodes 1' constructed in this way

Method used

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  • Electrode for a discharge lamp and a method for producing such an electrode
  • Electrode for a discharge lamp and a method for producing such an electrode
  • Electrode for a discharge lamp and a method for producing such an electrode

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Embodiment Construction

[0027] figure 2 A schematic sectional view through an electrode embodied as cathode 1 is shown. Cathode 1 includes a tip 11 , which in the exemplary embodiment is conically shaped. The tip 11 transitions into a cylindrical rod 12. In the longitudinal direction of the cathode 1 and thus in the direction of the longitudinal axis A, the cathode 1 has a length 11 consisting of the length 12 of the cylindrical rod 12 and the length 13 of the tip 11 . The configurations shown are exemplary only and may vary in length relationship as well as in shape.

[0028] as from figure 2 As can be seen in the illustration, the cathode 1 comprises a core 13 which, in the exemplary embodiment, is arranged concentrically and centrally in the cathode 1 and is thus constructed substantially rotationally symmetrically about the longitudinal axis A. In this exemplary embodiment, the core 13 extends over the entire length of the cathode 1 , the core being formed by the first material region and i...

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PUM

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Abstract

The invention relates to an electrode for a discharge lamp (I) with a cylindrical shaft (12) and a tip (11) which adjoins the cylindrical shaft (12), wherein a first material region (13) forming a core is formed in the longitudinal direction (A) of the electrode (1), and the core is surrounded, at least in regions, by a second material region (14) forming a casing. The invention also relates to a discharge lamp having such an electrode and to a method for producing an electrode for a discharge lamp.

Description

technical field [0001] The invention relates to an electrode for a discharge lamp with a cylindrical shaft and a tip connected to the cylindrical shaft. Furthermore, the invention relates to a method for producing an electrode of such a discharge lamp and a corresponding discharge lamp. Background technique [0002] The cathodes of DC high-pressure discharge lamps, such as HBO lamps (mercury vapor lamps) or XBO lamps (xenon lamps), usually consist of tungsten doped with thorium oxide. The portion of thorium oxide here is about 0.4 to about 2 weight percent. Since thorium oxide is a radioactive substance, radioactivity can also be confirmed in thoriated tungsten electrodes. Legal regulations govern the handling of radioactive material. If critical levels of radioactivity are reached, different labeling obligations and measures are required when handling these substances. The doping of the cathode with thorium oxide has the function of reducing the work function at the cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/073H01J61/82H01J61/86
CPCH01J61/16H01J61/0735H01J61/0732H01J61/20H01J61/86H01J61/09
Inventor 赖纳·科格尔马库斯·科沃杰伊奇克拉尔斯·门泽尔克劳斯·施泰德勒
Owner OSRAM GMBH
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