Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
June 16, 2009
Patent Application Number
11181862
Date Filed
July 15, 2005
Patent Primary Examiner
Patent abstract
In the transient electric power control of a discharge lamp containing no mercury or a small amount of mercury, a change value relating to a lamp voltage from the initial value thereof is detected. A control unit is provided to change the temporal change rate of electric power supplied to the discharge lamp during the transient time period in accordance with the increase of the change value or the time lapse.
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