HIGH VOLTAGE DISCHARGE LAMP OPERATION METHOD, OPERATION DEVICE, LIGHT SOURCE DEVICE, AND PROJECTION TYPE IMAGE DISPLAY DEVICE

WIPO Patent Application WO/2007/010781

A1

There is provided a method for operating a high voltage discharge lamp capable of increasing the service life of the discharge lamp. The operation method for turning ON the high voltage discharge lamp and maintaining the ON state is as follows. When the time elapse after the turning ON of the high voltage discharge lamp is within a predetermined condition (for example, 5 minutes or less have elapsed after turning ON), constant current control is performed if the lamp voltage is lower than switching voltage (here, a first voltage value V1) and constant power control is performed to maintain the lamp power at a power value W1 if the lamp voltage is equal to or above the switching voltage. After the predetermined condition (time elapse after turning ON is 5 minutes) is exceeded, the constant power control is performed by lowering the value of the switching voltage from the first voltage value V1 to the second voltage value V2. If the lamp voltage is equal to or above the switching voltage lowered. the lamp power is maintained at power value W1.

IKEDA MASARU
ONO SYUNSUKE
OZASA MINORU
YAMAMOTO MASAHIRO
YAMADA GO

PCT/JP2006/313744

January 25, 2007

July 11, 2006

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MATSUSHITA ELECTRIC IND CO LTD (JP)
IKEDA MASARU
ONO SYUNSUKE
OZASA MINORU
YAMAMOTO MASAHIRO
YAMADA GO

H05B41/24; G03B21/14; H04N5/74; H05B41/288

JP2005038815A	2005-02-10
JPH09330795A	1997-12-22
JP2005190766A	2005-07-14
JP2005122997A	2005-05-12
JP2005032711A	2005-02-03
JP2001312997A	2001-11-09
JP2004172086A	2004-06-17

NAKAJIMA, Shiro et al. (2-1 Toyosaki 3-chome, Kita-k, Osaka-shi Osaka 72, JP)

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