Patent ID: 9084332
Filing Date: 2015-07-14
Classification: G03B,H01J,H05B

Abstract:
1. A discharge lamp lighting device comprising: a resonant circuit section connected to a discharge lamp; a power conversion section adapted to convert direct-current power into alternating-current power and supply the discharge lamp with the alternating-current power via the resonant circuit section; a control section adapted to change a frequency of the alternating-current power in a stepwise manner with a frequency, which is different from a frequency causing a resonance of the resonant circuit section, intervening between frequency values of the frequency changed in a lighting start period until the discharge lamp reaches a stationary lighting state; and a lighting detection section adapted to detect lighting of the discharge lamp, wherein the control section changes the frequency of the alternating-current power in the stepwise manner with the frequency, which is different from the frequency causing the resonance of the resonant circuit section, intervening between the frequency values of the frequency changed if lighting of the discharge lamp fails to be detected by the lighting detection section.