| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device capable of suppressing flicker of light output from a discharge lamp as compared with a conventional one.SOLUTION: This discharge lamp lighting device includes a power feeding part for feeding an AC current to a discharge lamp in which a pair of electrodes are disposed face to face in a discharge container, a power control part for outputting a signal relating to a control power value to the power feeding part, and a pulse generating part for outputting a pulse wave to the power feeding part. The power feeding part is formed so as to convert a DC voltage supplied is to an AC current corresponding to the frequency of the pulse wave and the control power value and to supply it to the discharge lamp, the pulse generating part is formed so as to repeat a cycle in which after outputting a first pulse wave over a first period, a second pulse wave having a lower frequency than the first pulse wave is output, and the power control part performs control for varying the control power value so as to offset the change of light intensity during polarity reversal of the AC current in a specific period within the half period of the first pulse wave. |
