| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a high-pressure discharge lamp lighting device which reduces flickering of a high-pressure discharge lamp with relatively simple control. <P>SOLUTION: Upon start of lighting of a high-pressure discharge lamp, after the high-pressure discharge lamp reaches a substantially stable state or reaches a predetermined lamp voltage, the high-pressure discharge lamp is lit in at least three lighting modes with a predetermined average power put into the high-pressure discharge lamp, and in the lighting modes, a period of a positive polarity is nearly equal to a period of a negative polarity in a first mode, a period of a positive polarity is longer than a period of a negative polarity in a second mode, and a period of a positive polarity is shorter than a period of a negative polarity in a third mode. Each of periods t1, t2, t3 in the modes is at least one cycle, at least one first mode, and at least one second mode and at least one third mode are collectively defined as one set and the one set is repeated. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
