Patent ID: 7845806
Filing Date: 2010-12-07
Classification: G03B,H05B,Y02B

Abstract:
1. A discharge lamp control device which controls lighting of a discharge lamp, the discharge lamp control device comprising: a discharge lamp driver section which drives the discharge lamp by outputting an alternating current having a given drive frequency to the discharge lamp; and a discharge lamp drive control section which performs constant current control so that a discharge lamp current that flows between electrodes of the discharge lamp becomes constant when a discharge lamp voltage applied between the electrodes of the discharge lamp is lower than a first voltage, and performs constant power control so that an amount of power supplied to the discharge lamp becomes constant when the discharge lamp voltage is equal to or higher than the first voltage after the discharge lamp has been lighted, the discharge lamp drive control section including a discharge lamp drive frequency control section which causes the drive frequency when the discharge lamp voltage is lower than a second voltage which is equal to or lower than the first voltage to differ from the drive frequency when the discharge lamp voltage is higher than the second voltage.