Method and device for lighting ultra-high pressure discharge lamps
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United States of America Patent
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-
Sep 7, 2004
Grant Date -
Sep 26, 2002
app pub date -
Nov 1, 2001
filing date -
Mar 23, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is provided an improved method of lighting an ultra-high pressure discharge lamp in which a pair of electrodes are disposed confronting each other with a spacing of not more than 1.5 mm therebetween in an arc tube forming part of an envelope of quartz glass, the arc tube encapsulating mercury in an amount of 0.15 mg/mm.sup.3, the method including the steps of: reducing a lamp power supplied to the pair of electrodes to a degree such as not to stop arc discharge in a transition state from a lighting state to extinction; keeping the lamp power thus reduced for a predetermined time period; and shutting down the supply of current to the electrodes.
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