| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high pressure discharge lamp lighting device in which problems of blackening, going-out, sputtering or the like due to controlling at starting up are solved without changing a conventional circuit configuration. <P>SOLUTION: In the high pressure discharge lamp lighting device provided with a chopper circuit outputting DC power, a full-bridge circuit converting the output of the chopper circuit into AC output and supplying it a high pressure discharge lamp, an ignitor circuit generating pulse voltage for starting up the high pressure discharge lamp, and a controlling part controlling the chopper circuit and the full-bridge circuit, the ignitor circuit is provided with a lighting detection means detecting an existence of lighting of the high pressure discharge lamp and outputting it to the controlling part, and the controlling part is structured so that the chopper circuit or the full-bridge circuit is controlled so that a lamp current for a first period after the lighting is detected may become the first peak value or lower and moreover the lamp current during a second period after a given period elapses may become a second peak value, and the first period is 0.5-3 seconds and the second peak value is set to become 1.2-5 times the first peak value. <P>COPYRIGHT: (C)2010,JPO&INPIT |
