Discharge-lamp lighting apparatus and projector

Details Discharge-lamp lighting apparatus and projector Discharge-lamp lighting apparatus and projector

2008-07-15

2008-07-15

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S308000, C315S360000, C315S291000, C315S2090SC, C315S224000, C315S289000, C315SDIG002, C315SDIG002, C353S030000, C353S085000, C349S007000, C349S009000

Reexamination Certificate

active

11713034

ABSTRACT:
A discharge-lamp lighting apparatus includes a control circuit that determines electric power supplied to a high-pressure discharge lamp after the high-pressure discharge lamp is started by an igniter. The electric power is determined in accordance with a voltage corresponding to a lamp voltage detected by a voltage detection circuit and a drive current detected by a current detection circuit. When the determined electric power is less than predetermined electric power, the control circuit causes a down chopper to control the drive current such that an amount of increase in the electric power per unit time becomes equal to or less than a predetermined value.

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