| 摘要 |
PROBLEM TO BE SOLVED: To provide a high pressure discharge lamp lighting device capable of stably lighting a high pressure discharge lamp. SOLUTION: The high pressure discharge lamp lighting device comprises a power supply circuit which outputs prescribed d.c. voltage V1, a power converting circuit 4 which outputs d.c. voltage V2 by using the d.c. voltage V1 outputted by the power supply circuit 2 as a power source to supply prescribed power to a high pressure discharge lamp DL, a polarity reversing circuit 6 which converts the d.c. voltage V2 outputted by the power converting circuit 4 to rectangular wave voltage of a low frequency of several tens to several hundreds Hz and applies it to the discharge lamp DL, and a light dimmer 9 which outputs an illumination controlling signal setting intended illumination control power from the outside. The objective output of the power converting circuit 4 is increased upon polarity reversing operation of the rectangular wave outputted by the polarity reversing circuit 6, whereby the restrike of the discharge lamp DL becomes easy, the idle section of the lamp current is shortened, and discharge is stably retained to prevent fading-out. |
