Discharge lamp ignition device, equipment and image forming apparatus

摘要

An ignition device which ignites a discharge lamp comprises high-frequency voltage generator, a feeding harness line, and a lowpass filter. The high-frequency voltage generator includes a switch for generating a high-frequency voltage through high-frequency switching and an output transformer which outputs a high-frequency voltage. The discharge lamp is ignited by the high-frequency output voltage of the output transformer being applied between its paired electrodes. The feeding harness line has its one end connected to the high-frequency voltage generator and its other end connected to the discharge lamp and includes parallel conductors the length of which is 200 mm or more in length. The lowpass filter bypasses a high-frequency oscillating current which flows at no-load time mainly due to stray capacitance associated with the feeding harness line.