公开(公告)号：US20050077828A1

公开(公告)日：2005-04-14

申请号：US10500503

申请日：2002-12-12

Applicant: Michael Haacke

Inventor： Michael Haacke

IPC: H01J61/073 ,  H01J61/36 ,  H01J17/18 ,  H01J1/62 ,  H01J17/04

CPC classification number: H01J61/366 ,  H01J61/0732 ,  H01J61/0735

Abstract: A discharge lamp (10) is disclosed with a closed discharge vessel (20) which is surrounded by a wall of transparent material. Two electrodes (30) are present, partly embedded in the wall and projecting into the interior of the discharge vessel (20). At least one, but preferably both electrodes (13) are elongate in shape and comprise a head part (50) and a shaft part (40), which are distinguished by different diameters and/or different materials. Tungsten is preferred for the head part (50) and a tungsten-rhenium alloy for the shaft part (40). The shaft part (40) is enclosed in the wall material, usually quartz, whereas of the head part (50) only a first, short portion (50a) is in contact with the wall, while its second, longer portion (50b) projects into the interior of the discharge vessel (20). Favorable diameters for the head part (50) were found to be 350 to 450 μm, and for the shaft part (40) 150 to 400 μm. A long lamp life is achieved with the electrode design according to the invention, in particular in thermally strongly loaded discharge lamps as preferred for automotive applications. There are additional advantages in a lesser crystallization of the discharge vessel (20), less burning-off of the electrodes (30), and an improved run-up behavior.

Abstract translation: 公开了一种放电灯（10），封闭的放电容器（20）由透明材料的壁围绕。 存在两个电极（30），部分地嵌入壁中并突出到放电容器（20）的内部。 至少一个，但优选地，两个电极（13）的形状都是细长的，并且包括头部（50）和轴部（40），其通过不同的直径和/或不同的材料来区分。 对于头部（50）和用于轴部（40）的钨 - 铼合金，优选钨。 轴部分（40）被封闭在壁材料中，通常是石英，而头部（50）只有第一短部分（50a）与壁接触，而其第二较长部分（50b）投射 进入放电容器（20）的内部。 发现头部（50）的良好直径为350〜450μm，对于轴部（40）为150〜400μm。 通过根据本发明的电极设计，特别是在汽车应用中优选的热强负载放电灯中，实现长的灯泡寿命。 在放电容器（20）的较小结晶，电极（30）的燃烧较少以及改善的起动特性方面存在额外的优点。