Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Tomoyoshi Arimoto0
Izumi Takaya0
Katsumi Sugaya0
Date of Patent
October 21, 2008
0Patent Application Number
117434640
Date Filed
May 2, 2007
0Patent Primary Examiner
Patent abstract
To shorten the luminous flux rise time and prevent melting/deformation of the projections in the initial ignition period of high pressure discharge lamps that have a sealed mercury volume of no less than 0.20 mg/mm3, a power supply device feeds a current that exceeds the maximum current value of the constant power control period to the high pressure discharge lamp during a first control period from the initial discharge until the lamp voltage reaches a specified lamp voltage and causes a switch to constant power control, and then, during the following period until a change to steady power control, the power supply device feeds it a current that is less than the maximum current during regular operation.
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