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1. (US20090115974) High pressure discharge lamp operation method, operation device, light source device, and projection type image display device

Office : United States of America
Application Number: 11916712 Application Date: 11.07.2006
Publication Number: 20090115974 Publication Date: 07.05.2009
Grant Number: 7667413 Grant Date: 23.02.2010
Publication Kind : B2
Prior PCT appl.: Application Number:JP06313744 ; Publication Number: Click to see the data
IPC:
H05B 37/02
H ELECTRICITY
05
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
B
ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
37
Circuit arrangements for electric light sources in general
02
Controlling
Applicants: Panasonic Corporation
Inventors: Ikeda Masaru
Ono Syunsuke
Ozasa Minoru
Yamamoto Masahiro
Yamada Go
Priority Data: 2005207414 15.07.2005 JP
Title: (EN) High pressure discharge lamp operation method, operation device, light source device, and projection type image display device
Abstract: front page image
(EN)

Provided is a method for lighting a high pressure discharge lamp capable of increasing the life thereof. The lighting method is as follows. When the time elapse after lighting up the discharge lamp is within a predetermined condition (e.g. 5 minutes or less), 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 (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.


Also published as:
JPWO2007010781JP4682202CN101223829WO/2007/010781