HIGH-VOLTAGE DISCHARGE LAMP LIGHTING DEVICE AND IMAGE FORMING DEVICE EQUIPPED WITH SAME

摘要

The purpose of the invention is to obtain a DMD using type high-voltage discharge lamp lighting device that, even when a minute projection is formed at a location apart from an electrode tip as compared with a conventional case, makes it possible to make the minute projection disappear while maintaining a stable arc discharge. The lighting device (1) comprises: a pulse generation unit (4) for generating a pulse wave (P), the polarity of which is changed based on a synchronization signal (Sb) synchronized with the timing at which a color region of a color wheel to be illuminated with light from a high-voltage discharge lamp (10) is changed; and a power supplying unit (3) supplied with a DC voltage and, after converting the supplied DC voltage into an AC current according to the frequency of the pulse wave (P), supplying the AC current to the high-voltage discharge lamp (10). The pulse generation unit (4) repeats a cycle multiple times, in which a first pulse wave is output over a first period and then a second pulse wave having a frequency lower than that of the first pulse wave is output over a second period shorter than the first period, and then repeats this cycle multiple times after changing the frequency of the second pulse wave.