High pressure discharge lamp with tungsten electrode rods having second parts with envelope of rhenium
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United States of America Patent
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Mar 18, 2003
Grant Date -
N/A
app pub date -
Jun 22, 1999
filing date -
Jun 30, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The high-pressure discharge lamp comprises a sealed lamp vessel (1) having a quartz glass wall (2) enclosing a discharge space (3). Metal foils (4) are embedded in the wall, connected to electrode rods (6) projecting from the wall into the discharge space. The electrode rods (6) have a first part (7a) and a second part (7b) with a diameter of between 250 and 350 .mu.m and at least an envelope (7c) made of rhenium. The second part, which is positioned within the wall (2), prevents premature failure of the lamp caused by leakage.
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