Discharge lamp control device controlling lighting of a...

Details Discharge lamp control device controlling lighting of a... Discharge lamp control device controlling lighting of a...

2008-02-09

2010-12-07

Sohn, Seung C (Department: 2878)

Optics: image projectors

Lamp control

C315S291000

Reexamination Certificate

active

07845806

ABSTRACT:
A discharge lamp control device includes: a discharge lamp driver section which drives a 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 lamp becomes constant when a discharge lamp voltage applied between the electrodes of the lamp is lower than a first voltage, and performs constant power control so that an amount of power supplied to the lamp becomes constant when the discharge lamp voltage is equal to or higher than the first voltage after the lamp has been lighted. The discharge lamp drive control section includes 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 be lower than the drive frequency when the discharge lamp voltage is higher than the second voltage.

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