Method and device for lighting high pressure discharge lamps
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United States of America Patent
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Jul 5, 2005
Grant Date -
May 6, 2004
app pub date -
Aug 7, 2003
filing date -
Nov 6, 2002
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Abstract
Improved method and device for lighting a high pressure discharge lamp are provided which prevent arc jump and inhibit deterioration of lamp voltage and luminance. The method includes the step of: alternately repeating a superposition operation for superposing a pulse current on a lamp current applied to the high pressure discharge lamp for a predetermined time period and a superposition stopping operation for stopping the superposition of the pulse current for a predetermined time period.
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