| 摘要 |
A lighting device of a discharge lamp, the lighting device includes: a DC voltage generating circuit including: a switching element that is controlled by a first controlling signal; and a coil that has one end portion, to which a first DC voltage is input, and the other end portion of the coil outputs a second DC voltage, and an AC voltage generating circuit that converts into an AC voltage and supplies to the discharge lamp; and a control circuit unit, which receives a polarity-inversion instructing signal, which generates a second controlling signal to determine a timing of polarity-inversion after a predetermined first period is elapsed, which sets a latest ON period, wherein the latest ON period is set based on both an elapsed time and the duty ratio, and which generates the first controlling signal to restart the ON/OFF control at a timing after a second period is elapsed.
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