| 摘要 |
PROBLEM TO BE SOLVED: To prevent occurrence of flickering by arc jump due to temperature difference between electrodes by eliminating temperature difference between lamp electrodes in a high pressure discharge lamp. SOLUTION: In a high pressure discharge lamp lighting device, the AC lamp current waveform impressed on the high pressure discharge lamp is made to consist of a repetition of a waveform having as one unit a first period of a current value (+i1) and width (d1), a second period of the current value (-i2) and width (d2), a third period of the current value (+i3) and width (d3), a fourth period of the current value (-i4) and width (d4), a fifth period of the current value (+i5) and width (d5), and a sixth period of the current value (-i6) and width (d6), and (d1+d2)<d3, and (d4+d5)<d6 and at least i5, i2>i3, i6 are set, and in the fifth period, i5×d5≥i1×d1, and i5×d5>i2×d2≥i4×d4 applies. COPYRIGHT: (C)2008,JPO&INPIT |
