Discharge lamp lighting apparatus and projector

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

2007-12-04

2010-12-07

Luu, Thanh X (Department: 2878)

Optics: image projectors

Lamp control

C315S2090SC

Reexamination Certificate

active

07845805

ABSTRACT:
A discharge lamp lighting apparatus for lighting a discharge lamp, comprises an inverter which reverses a polarity of an output voltage and applies alternating voltage to the discharge lamp, and an inverter control circuit which generates an inverter control signal defining a polarity reversal operation of the inverter, based on a polarity reversal timing signal, wherein when the number of polarity reversals in one cycle of the polarity reversal timing signal is even, the inverter control circuit intermittently performs a first operation in which successive pulse-like part of the polarity reversal operation based on the polarity reversal timing signal is disregarded by odd number of times.

REFERENCES:
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patent: 6520648 (2003-02-01), Stark et al.
patent: 7443103 (2008-10-01), Li et al.
patent: 8-505031 (1996-05-01), None
patent: 2004-526992 (2004-09-01), None
patent: 2006-059790 (2006-03-01), None
patent: 2006-227440 (2006-08-01), None
patent: WO 02/063391 (2002-08-01), None

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