| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lighting device and a lighting method which suppress occurrence of a plurality of projections and prevent flickering while defining a start point of arc at one projection. <P>SOLUTION: The high pressure discharge lamp lighting device is composed of a power supply means to supply AC current to the high pressure discharge lamp according to a prescribed output parameter and a control means to control the power supply means. The prescribed output parameter consists of an output parameter for growth mode to form and grow a projection at the tip of an electrode constituting the high pressure discharge lamp and an output parameter for melting mode to melt and eliminate the projection, and the control means is provided with a detection circuit to detect a lamp parameter regarding the lighting state of the high pressure discharge lamp and a mode control circuit to switch over alternately the output parameter at a prescribed timing based on the lamp parameter. <P>COPYRIGHT: (C)2008,JPO&INPIT |
